Arc Cutting — can be done with a 6010 or 6011 rod with the machine turned up to "warp 10". (very hot) Other rods can be used but these two are the best. It is where you cut through the steel using the force of the arc. It doesn't make the prettiest cut, but will do in a pinch when you don't have a torch.
Arc Gouging — is where the steel or metal is cut using an arc from a carbon electrode. The electrode is solid carbon wrapped in copper for conductivity. The stinger has compressed air and when a button is pushed, it blasts air at the molten metal being cut. The machine is turned to "warp 10" which means you are using a LOT of amps (heat).
An example of this is when we went to a job where 5 stainless steel tanks about 10 stories high had almost every weld flunk an x-ray test. We gouged the weld on the outside, then re-welded them. We then gouged the welds on the inside and re-welded into our previous weld.
Thick stainless can't be torch cut, and even if it could, the heat would cause it to warp. Arc gouging keeps the heat concentrated at the cut.
Alloy — is an element added to a metal. An example is mild steel with chromium (resist rust), and nickel (makes it less susceptible to oxidation which is rust) which makes a form of stainless steel.(the most common stainless is 304)
Alternating Current — reverses back and forth from positive to negative on a sine wave. It makes for an erratic arc on most welding processes and that is why DC is preferred.
Amperage — measures electricity flowing and is the same as current, which is your heat.
Arc — is what is between the end of the electrode and the base metal. The resistance causes heat.
Automatic Welding — is a weld made by equipment such as robots.
Backup Strip — is a strip or section of steel butted up to an open gap between two pieces of steel. 6010 welding rods can be used for open butt welding, but 7018 cannot and requires a backing strip to provide a surface for the electrode to weld to. Some backup strips are cut off and some are left in place.
Bead - the deposited filler metal on and in the work surface when the wire or electrode is melted and fused into the steel. A stringer bead is a narrow bead with only a dragging motion or light oscillation, while a weave bead is wider with more oscillation.
Bevel - an angle cut or grinded at the edge of the work-piece to allow more penetration for a stronger weld.
Blown-up - what you will be if you weld or cut on containers with fumes. NEVER weld or cut on any container unless it is new or you know it has been cleaned and safety certified! Containers can be toxic, flammable, or explosive.
Brush - steel wire bristled hand brush, disc brush for a hand grinder, cup brush for hand grinder, or wheel brush for bench grinder. They're used to clean mill scale, oxidation, dirt, oil etc. off of steel surfaces. Cleanliness is of utmost importance on the work piece to assure there will be no weld defects. It is important to use a stainless steel brush and mild steel brush correctly.
Build-Up Weld - building up the surface of a steel part such as the teeth of a sprocket, surface of an idler wheel (keeps the track in place on tracked vehicles such as bull dozers or cranes), or bucket on a front-end loader. In most cases it is far less expensive to have a welder build up a component than it would be to replace the part. Build-up welds are usually done with hard surface electrodes.
It is also a good way for a new welding student to learn proper re-starts and tie-ins.
Busted Out - failing a weld test because of defects in the welds. "He busted out on his test plates and didn't get hired."
Butt Joint - just what it sez'…two pieces butted up against each other. Only the top and bottom surface can be welded. Without good penetration, this weld does not have the strength of a multi-pass fillet weld, or beveled joint.
Cap - the last bead of a groove weld, it can be made with a weave motion back and forth, or with stringer beads tied into each other.
Also what you need to wear on your head when welding Mig vertical, or any process overhead, to keep hot sparks off of your head. (see Cussing.) Welder's hats have a small bill and are so high they need a warning light to keep airplanes from crashing into them. This is so they can be turned and pulled down over your ear when welding pipe and your head is tilted. You don't EVEN want a glob of molten metal going into your ear! You can literally hear it sizzle as you suffer through the burn. Welding hats could win any ugly hat contest with all the crazy polka dots, paisley and other crazy designs.
Cardinal Sin of Welding - see undercut.
Coalescence - ah, this is when the metal or steel is fused (joined) grasshopper.
Coated Electrode - That is the flux on the filler metal of a welding rod. They used to use bare rods only in the horizontal position. Someone noticed that a rusty rod worked better than a brand new one so they started experimenting with different coatings on different rods. They found that some coatings produced a shielding gas that protected the weld pool from contaminants in the atmosphere. Contaminants cause Porosity and Longitudinal Cracking. With the weld pool protected the weld was smooth and sound and could be used in different positions rather than just flat. I can only imagine how many times those bare rods would get stuck!
Concavity - It is when a Fillet Weld bead sags inward from the root Face to the Root.
Consumable Insert - This is where a filler wire or rod is in a gap and you weld it into the base metal along with your wire or rod. It becomes one with the weld grasshopper.
Convexity - This is when a Fillet Weld bead protrudes outwards from the Root to the Face.
Corner Joint - One of the five basic weld Joints. It is when the edges of two plates butt up to each other at a 90 degree angle. It usually provides a groove to fill providing good Penetration.
Cover Glass or Cover Plate - Clear glass or plastic lens in a hood or cutting goggles that protects the #5 (for cutting) or #10,11, 12 lens (for welding) from getting spatter on them. Gripes the heck oughta' me when a student forgets to put it in when they change out the lens. They then weld with it and the spatter ruins the # glass which ain't cheap! You should change the cover plates often as they restrict your view when they get spattered or scratched up.
Crack - Where the weld fractures or breaks apart. A good example would be welding on cast iron. If it is not pre-heated and post-heated right, or if the wrong electrode is used, it will crack BIG TIME. Sometimes the crack will run right in front of the weld pools as you weld.
You should pre-heat, post-heat, and run cast iron rod, which has a nickel content. A trick to keep a crack from spreading is to drill a hole before and after the crack you are about to weld. Run the weld, and then fill the holes. The holes keep the crack from spreading.
Crater - At the end of the weld bead you burn into the steel without depositing any filler metal which leaves a depression in the base metal. When doing a Restart, you want to start at the end of the crack, weld back into where the weld stopped, and then proceed in the direction you were welding. This pre-heats and gives a good Tie-in into the bead you just laid.
Critical Temperature - This is when the base metal transitions from solidus to liquidus as you heat it during the welding process. It's right at that point where it goes from being solid mass, to melting and becoming liquid. This is a great term to discuss at a cocktail party to make you sound smart, ESPECIALLY if your audience doesn't know much about welding!
Current - In the electric circuit the current is the flow of electricity. What you're welding on resists the flow and that forms heat. AMPS are the measurement of your current. To get a bit more technical, current is negatively charged electrons passing through a conductor, which is usually a wire.
Cylinder - What we store oxygen and acetylene in for cutting, and SHIELDING GAS for the MIG and TIG welding processes. They come in different sizes and you wanta' research before you buy. If you get too small of one, you'll get real tired of refilling it all the time.
Defect - Something that ain't right with the weld. Main defects are Longitudinal Cracks, Porosity, Slag Inclusion, and the "Cardinal Sin" of welding…Undercut.
Depth of Fusion - How deep your filler metal penetrates into the metal from the surface.
Direct Current - DC welding is the smoothest welding producing the least amount of spatter. The current is flowing one way, from negative to positive. (Cathode to Anode)
It is similar to when you turn on a water hose and the water flows out. With DC the current ALWAYS flows the same direction. You can however, change your welding leads to change Polarity.
Direct Current Electrode Negative - Electricity flowing OUT OF the welding Rod or Wire is dispersed into the work piece therefore giving less penetration. About 1/3 of the heat is on the end of the rod and 2/3 on the work piece. This is what you want to use for thin gauge metals.
Direct Current Electrode Positive - Electricity flowing INTO the welding Rod or Wire and therefore putting more heat at the rod or wire end. This gives you 2/3 heat on the rod and 1/3 on the work piece, which gives greater penetration for thick metals because the arc force digs into the steel before depositing filler metal.
Ductility - Is the metal bending and staying bent without breaking.
Duty Cycle - This is how long a machine can run in a ten minute period of time before it overheats.
10% = 1 minute out of every 10.
20% = 2 minutes out of every 10.
On up to 100% which would run the full time without stopping.
For a machine in a factory or construction site you'd want a 100% duty cycle.
For your hobby workshop you might get by with 20 or 30%.
Even in the busiest factory there's gonna' be off time in a ten minute period. If you're stick welding, you might run a little over a minute. Then you're gonna' raise your hood, check out what everyone else is doing, think about what you're gonna' do that night, chip the slag, brush the weld, check what time it is, change rods, and FINALLY start back to welding.
Edge Joint - The outer edge of two plates butted up 90 degrees parallel to each other.
Edge Preparation - Before welding the edge of a plate or pipe, care is taken to ensure a sound weld. It may be torch cut or beveled, machined with a grinder, filed, or all three.
Electrode - Electrodes come either covered with flux, or just bare wire. In the field an electrode is called a "rod" in stick welding, and "wire" for Mig and Flux Cored Arc Welding.
There are MANY different types of electrodes.
In WWII bare rods were used that could only be used in the flat position. It was VERY easy to stick these rods, and I can only imagine how frustrating it must have been to use them. One day a guy noticed that a rusty rod he picked up welded better than the brand new ones.
Experimenting with different types of coatings like silicon and potassium, it was determined that flux on a rod not only helped it burn better, but produced a shielding gas that protected the weld pool from the atmosphere.
Electrode Holder - A hand clamp that holds a welding rod and conducts electricity out of the rod in DIRECT CURRENT ELECTRODE NEGATIVE, or into the rod in DIRECT CURRENT ELECTRODE POSITIVE.
Face - On plate or pipe welding there is a
Fan: Welding machines have a fan to cool the machine down and keep it from overheating. (see DUTY CYCLE) Some fans run constantly, while others run "on demand" which means it comes on when necessary and clicks off when not needed.
(It is a good idea to blow out the welding machine with compressed air at least once a month. This keeps dust from accumulating and possibly interfering with the inside electrical workings. All machines have vent slots and each slot should be blown out.)
Ferrous Metal - Iron comes from ore that is mined from the Earth. Ferrous means that the metal is iron, or iron with alloys.
Filler Metal - This is metal added to the weld pool. A weld can be made with or without filler metal. Thin gauge metal is sometimes welded by melting the two base metals together.
Flash Burn - This is a burn from the radiation produced from the ULTRA VIOLET rays from the welding arc. It can burn the skin similar to sunburn, and even blister the cornea. You don't realize it until hours later when it feels like someone is rubbing hot sand in your eyes.
Two of my students were welding too close to each other and I told them to move, but they said they were just fine. Yeah, what do I know? I've only been doing this 30 freaking years compared to their three or four months!
Welp, that night they were in the emergency room getting salve for their eyes and a nice $300 emergency room bill.
You should never be where you can see the welding arc light without protective lenses, even if it is just out of the side of your eyes. In my shop we announce loudly "WATCH YOUR EYES!" before striking an arc to warn you to cover your eyes.
Fillet Weld - The king of welds because it is used in so many applications, it is mostly used on Tee joints. . (See JOINTS.)
Two pieces of metal butted together at a 90 degree angle, a bead is run half way into each piece. Depending on the thickness, it could take one bead, or multiple beads TIED-IN to each other.
Fillet Weld Face - The surface or top of the weld.
Fillet Weld Leg - From the intersection of the joint to the end of the weld. There will be a leg for each plate.
Fillet Weld Toe - Is the end of the weld at the end of the leg. Again there will be one for each plate.
Fillet Weld Root - Where the weld begins at the intersection of the joined plates.
Fillet Weld Throat - The distance from the root to the face.
Flow Meter - The pressure in a SHIELDING GAS bottle can be up to 2400 lbs. per inch. The flow meter reduces this to a working pressure, usually around 20 to 25 cubic feet per hour.
Flux:
Cleans the surface and when burned makes a SHIELDING GAS that protects the weld POOL, or PUDDLE from atmospheric contaminants that cause DEFECTS.
Flux-Cored Arc Welding (FCAW) - Long thin flat strip is run through a series of dies until it begins to curl up on the sides. FLUX is then added and it continues through the dies until it is rolled into a tubular wire.
Similar to SOLID STEEL WIRE, it is rolled and used similar to MIG usually set to DIRECT CURRENT ELECTRODE NEGATIVE. When the wire is melted to become FILLER METAL, the FLUX burns and forms a SHIELDING GAS.
Therefore, no SHIELDING GAS is needed, so it can be used in drafty areas or even in the wind, unlike it's cousin MIG.
Free
This is one way of demonstrating QUALIFICATIONS to become certified. Welding is one of the most demanding trades because the welder always has to show they are qualified.
I have 30 years of experience in the shop, Iron Workers Union, and education, yet if I went to a job on say, a power house, with a welder whose been in the field only a couple of years, I'd still have to take a test with them!
Critically demanding jobs require X-RAY qualifications which are non-destructive, but show everything!
Fumes - Whether you are a skilled JOURNEYMAN, or NEWBIE, you should always be careful of fumes when cutting and welding.
From GALVANIZED zinc fumes which make you sick, to more dangerous phosgene gas which can be emitted from the UV RAYS around some cleaning solutions, FUMES can be dangerous!
Always make sure you have proper ventilation, especially in confined quarters!
Fuse - If you purchase a welder to use around the house, make sure you have the proper fuse so you don't blow everything out. In older houses, make sure the wiring has been updated or you could cause a fire when they overheat.
Fusion - As stated in COALESCENCE, fusion is the melting and becoming one with the base metal or PARENT METAL you are welding grasshopper.
This is also a word for what the doctor wants to do to my ankle that I shattered when I fell three stories. Wants to take a chunk of my hip bone and fuse it to my ankle. Trouble is, it'd take longer for the hip to heal than the dang ankle! So…that little operation ain't gonna' happen. Heck, it only hurts when I'm awake anyway!
Galvanized - An electrochemical process where mild steel is hot-dipped into liquid zinc to make it anti-corrosive. I was surprised to learn it has been done for 150 years!
When you weld on galvanized steel you have to burn through the zinc coating first and it produces FUMES that can make you feel sick like you've been punched in the gut.
Drinking milk before, during and after welding is supposed to help, but proper ventilation and not breathing it at all is best.
Gas Metal Arc Welding (GMAW) - see "MIG"
Gas Tungsten Arc Welding - see "TIG"
Groove Weld - When a very strong weld is needed, such as where two columns are spliced together on a high-rise, it is important to get the maximum penetration and fusion. This is done by cutting a BEVEL so that you can weld solid from the ROOT, to the FACE of the PARENT METAL.
Heat Affected Zone - Something many welders do not consider, but they should. Anytime you weld on metal or steel, you are heating the area next to the weld. After it is heated, it cools at different rates depending on the temperature in the shop or field.
On construction projects in the winter, this can be very rapidly. Both the heating and cooling can affect the properties depending on what base metal you are welding on.
The heat affected zone on mild steel is usually no big deal. However, if you weld on cast iron, for example, without properly pre-heating and post-heating, it will crack right before your eyes.
Inverter - Relatively new, I first heard of them about 13 years ago. A power source for welding machines that is much more efficient than the normal transformers most machines use, and therefore much smaller units.
When I first started welding thirty years ago in a black iron shop, I used a welder that looked like a big atomic bomb with a box on top of it. It was at least four feet wide, two feet deep and about three feet tall.
Today they have machines that can do everything that one could, plus some and they're the size of a small suit case which is much more convenient for the shop and field.
Iron Workers - There are a couple of meanings here. The first is the union I belong too, the International Association of Bridge, Structural, Ornamental and Reinforcing Iron Workers. As the title suggest, we work on structures, everything from high rise office towers, to dams, power houses etc. After a 3 year apprenticeship, I became a structural welder. There are other gangs (crews) such as the Raising Gang, Plumb Gang, Bolt-up Gang, and Miscellaneous Gang. Although I've worked on them all, I spent most of my time on various Welding Gangs seeing as how welding is my true love!
This is also the term for a machine, both HUGE ones, and those small enough to be portable on jobs. It can shear metal, cut angles, and punch holes. You're gonna' invest a minimum of around a couple of thousand for a smaller model. Don't even want to think what the big ones cost.
Intermittent Weld: A very common mistake in welding is welding it too much! A lot of welders, especially those new to the trade, figure "the more the weld the better it'll hold." Well, it AIN'T true! Many times one or two inches of weld every couple of inches will hold just as good as a continuous weld.
On most jobs, whether in the shop or field, the welds will be on a blueprint so that you will know just what to do. Engineers determine what kind of weld is the best for the joint involved.
There are two types of intermittent welds. I'll give an example from a black iron fabrication plant I once worked at:
1) "Chain" On a twenty foot beam, we would find the center at say, ten feet. We would mark two inches, one inch on each side of the center. Then, from the center of that weld, we'd make a mark twelve inches away. On that mark, we'd measure one inch on each side. That way we were measuring from center to center on each weld. In most construction, just about everything is measured from center.
On the other side of the beam, we'd mirror the marks of the first side.
Obviously, the ends of the beam would not come out right in sequence, so it was important that we made sure and put two inches on each end even if it was right next to the other two inch marks we had made.
2) "Staggard" After making the marks on one side of the beam, we would place the other side in-between the marks on the first side.
These welds are strong enough to hold and it is overkill to weld these joints solid. When overzealous welders over weld, they are screwing up in several ways…
- They are
heating the base metal which can change its properties adversely.
- They are
spending unnecessary time. In the shop and field "Time is
MONEY!"
- They are
wasting materials by using rods which are costing more and more each year.
Joint - Intersection where two different sections of PARENT METAL meet. To be listed under WELDING JOINTS. On a power house, they'd ask how many joints we welded each day.
There were many different types such as beam to beam, beam to column, x braces etc. Although it was not an accurate account, it gave the foreman an idea of what was getting done.
Keyhole - When welding an open butt, or open groove weld JOINT with STICK, MIG or TIG, a "keyhole" will open up. When the sides of the plate burn away on each side of the WELD POOL a hole is formed which allows for good TIE IN and PENETRATION.
The keyhole must not be allowed to grow too large or the WELD POOL will waterfall out the back of the joint.
If the keyhole grows too large, stop welding immediately, let the plate cool and make the proper adjustment to correct the problem. (Too much heat, wrong rod angle, or staying too long in the puddle may be the cause.)
Labor Unions - A good site listing trade unions is http://www.trcp.org/unions.aspx.
In my experience as an Iron Worker, I'd say you'd have the most chance of welding in the following…
Boilermakers
Iron Workers
Pipefitters
Pipeliners
Sheetmetal Workers
Leads - These are the lines from the machine to what you are welding that carry the current. They are lots of copper wires woven into one to conduct electricity, then covered with a non-conductive rubber or plastic wrap.
It is important to make sure there are no rips or a tear in the leads exposing bare wire which could arc on a grounded surface. Besides being a shock or fire hazard, it would especially be bad if it came in contact with a pressurized gas bottle!
Liquidis - A word that makes you sound smart when you mean the lowest temperature that steel or metal is liquid. Guess what "solid" is called? (See SMART TALK)
Machine Welding - Equipment performs the weld while a person watches to make sure it is working right. They will also visually inspect the completed weld. Whether with robotics, or machine welding, most companies prefer someone who has actually welded in the field because they have a "feel" for it.
Journeyman welders can actually feel the weld TIE-IN to the steel. When I'm STICK WELDING with 7018, I can literally feel the rod give ever so slightly as it coalesces with the steel.
Manual Welding - A person is doing the actual welding. In SMAW (stick) they are holding the STINGER and manipulating the WELDING ELECTRODE to control the WELD POOL. In MIG they are using a Mig gun feeding wire to do the same. In TIG they're using a torch and manually feeding a filler rod.
Melting Rate - How much of the rod (electrode), wire, or TIG rod is melted in a certain amount of time.
Melting Point - Ahhhh grasshopper, this is where the metal goes from SOLIDUS to LIQUIDUS. See SMART TALK.
MIG (GMAW or Gas Metal Arc Welding)- It may be technically called GMAW, but in the shop and field all I ever heard was Mig.
Mig welding uses a solid steel wire rolled up on a spool and fed through a welding lead with a liner in it. Drivers push, pull or both to feed the wire through the lead to the WELDING GUN.
It uses several different mixtures but the most I've used is either stratight carbon dioxide, or a mixture of the inert gas argon and CO2 (75/25 is common. 75% Argon, 25%CO2) to shield the weld PUDDLE from the atmosphere.
Non Ferrous - Does not come from iron ore. It is mined pretty much in its true form such as copper, aluminum, nickel etc.
Nozzle - A brass attachment that is about three inches long and shaped as an open cylinder. It is put over and insulator (to keep the nozzle from being electrically charged which would short out on the PARENT METAL and shock the heck out of someone not using a glove.) and seals at the top giving the shielding gas one direction to go…out over the weld.
It is real important to continuously clean built up SPATTER from out of the NOZZLE. Anti-spatter sprays and dips help keep the spatter from sticking to the inside of the nozzle which blocks the SHIELDING GAS.
Open Circuit - Cross your arms across your chest. Now uncross them. When they are crossed, they are like a "CLOSED CIRCUICT." When they are not crossed, they're like an open circuit. When the switch on the welding machine is open, it is not completing the circuit, therefore electricity can not flow.
When it is closed, the switch joins the two conducting parts completing the circuit, allowing electricity to flow across.
Oscillate - While dragging (back hand) or pushing (fore hand) the weld PUDDLE, you oscillate by moving side to side. (Think of an oscillating fan.) This feathers, or washes in the sides of the PUDDLE into the PARENT METAL.
Ovens - see POROSITY, and also check out the ovens on this site.
Overfill - Similar to overkill, many welders think the more the weld deposited, the better the weld. Overfill is a waste of time and material, and can weaken the steel by placing too much heat on the joint. (Opposite of this is UNDERFILL)
Parent Metal - also called "base metal", this is the metal or steel that you are actually welding on.
Peening - When you're mechanically working the metal, you are peening. How do you mechanically work it? You get a beater (hammer) and beat on it. What it does is release stresses in the steel. Use EarPlugs!
Penetration - Is the FUSION or depth into the PARENT METAL from its surface, or the amount of FUSION through an open faced joint.
Plastic Welding - Yep, there is actually plastic welding. It uses several different processes. Saw one in the field with a hot air gun that almost looked like a hair dryer, and a long plastic weld rod.
Plug Weld - Say you have two pieces of steel you want welded together. One has a hole in it, the other doesn't. You lay the whole piece on the solid piece, and then weld in the hole making sure you burn into the bottom piece. You can either make one weld at the bottom of the hole (properly TIED-IN of course) or fill the hole in flush.
I spent two full weeks at a power house plugging holes. After it had been damaged by a tornado, it was decided to weld all the gusset plates and connections that were usually bolted. They then had us remove the bolts and put plugs into the holes, which served no structural value, but were for aesthetics only. To this day, I wonder why the heck they didn't just leave the bolts in! And I still can't believe I repeatedly risked my life working in very high, awkward situations, just to plug a dad gummed hole!
Polarity - Back in the day, we referred to the flow of current as STRAGHT POLARITY and REVERSE POLARITY. In SP, the electricity flowed out of the STINGER and into the WORK CLAMP. In RP, the electricity flowed out of the WORK CLAMP and into the STINGER.
For a better explanation see DIRECT CURRENT ELECTRODE NEGATIVE and DIRECT CURRENT ELECTRODE POSITIVE, what we now use instead of POLARITY.
Porosity - Referred to as worm holes, these are gas pockets trapped in the weld. A couple of reasons would be from not enough shielding gas in MIG, or moisture in the FLUX in 7018 low hydrogen rods.
Ports - In a mig gun there are small orifices (holes) that allow the flow of shielding gas. The NOZZLE then directs the gas out over the weld PUDDLE.
Positioner - These are usually found in the bigger more prestigious fab shops. They can turn, tilt, rotate, revolve and that allows you to make most of the welds in the flat or horizontal WELDING POSITIONS which is really NICE!
Pre Heating - Some steels will accept the weld better, and the weld will be more sound if the steel is heated before being welded on. This is especially true up North in the winter time. Adding hot filler metal to cold steel is NOT a good idea because it could cause the steel to become brittle and crack.
Most of the time the weld specs will tell you what the PRE-HEAT temperature is. One way of checking the steel is with heat pencils which melt at certain temperatures to show when the right heat is achieved. See CRACKING.
Post Heating - I know, I know, it ain't in alphabetical order, but I just couldn't put POST-HEAT in front of PRE-HEAT 'cause it just doesn't work that way. Post-heat is of course, exactly what it sez…heating it up after you have welded.
Actually what you are doing is controlling the cool down of the steel. Instead of letting it cool down on its own, you heat it periodically and slow down the cooling process.
This is more for the exotic metals, as a structural Iron Worker I never had to do any post-heating. However, when working in a shop a few times on cast iron, I had to post-heat the cast iron to make sure it didn't crack.
Puddle - Ahhh, the puddle. My welding instructor used to drill into my head "RELAX your hand and WATCH the PUDDLE!" The PUDDLE is the same as the WELD POOL. It is the molten filler metal that is combining with the PARENT METAL. You have to see it and manipulate it to make a good weld.
Quench - Rapidly cooling the steel to make it harder. The steel has to have enough carbon in it for it to harden. Mild steel can't be quenched to harden it because it has only .33% carbon in it. You need about .70% to be able to harden by quenching. You are changing the crystal structure from one atomic pattern to another.
Radiation - The welding arc puts out radiation that you must protect yourself and others from. It is important that you announce to others that you are preparing to strike and arc. In my shop we holler "WATCH YOUR EYES!!!" That means it's up to you to look away from whoever just said it. See FLASHBURN.
Besides burning your eyes, the radiation emitted from the arc can also burn your skin similar to a sunburn. You should always cover your skin with dark colored cotton, wool, or leather. Repeated radiation burns of the skin can result in skin cancer later in life, which is a very fast growing, and deadly form of cancer.
Radiography - Is the enemy of bad welders. The weld is x-rayed and it will show even the minutest WELD DEFECTS. (Slag inclusion, porosity, or undercut!)
Rods - See ELECTRODE. What we call electrodes in the shop or field. Nobody asks for more "electrodes", they ask for more rods. Just like the actual term is "SMAW", in the shop or field we call it "Stick Welding." So, if I'm "stick welding", I'm using "rods."
Root Opening - If you're welding two plates together that are beveled, (see BEVEL) the root opening is the gap separating the two plates.
Root Penetration - How far the FILLER METAL is penetrating into and through the ROOT OPENING.
Safety - ahhhhh Grashopper, this is absolutely the MOST important part of welding, the safety of you AND others!
Welding has all kinds of inherent dangers. I've had quite a few smashes, bumps, bruises, cuts, scrapes, shocks etc. But the worst was when I was knocked off of the 3rd floor of a building (well, actually right below the 3rd floor, but who's counting?) and shattered my ankle.
However, although dangerous by nature, it can be relatively safe if the proper safety practices are followed, AND common sense is used.
One of my pet peeves is all the different shows on TV that show people blatantly disregarding safety. All it takes is a split second to be hurt, or hurt someone else. And usually it would've just taken a moment to do it right, or get the right tool, or protective gear.
There are all sorts of books, articles and guides to welding safety. Just remember that you can get yourself and others hurt or killed if you don't learn and follow these practices.
Two of the accidents that I hear about almost every year are eye injuries (from not wearing the proper protective devices) and people hurt or killed from welding on or near containers.
Welding/Cutting on or near a container that you don't know about is dangerous in three ways…
It can be toxic, flammable, and or explosive.
NEVER, NEVER, NEVER weld on
a container that is not either new steel, or has been cleaned and safety
certified. I don't weld on used containers PERIOD. Ain't worth life or limb to make a dang barbeque!
Also, on cars or trucks, gas tanks should be removed or made sure to be full so they don't explode. If it is full, the most it could do is burn. If there are fumes and a wayward spark, or current traveling the wrong way, you might just wake up DEAD!
Seam Weld - The seam is right where the two plates, strips, etc. touch. It is important that you get half of the WELD POOL on each side of the seam.
In ARC GOUGHING (where you are cutting an existing weld out) you want to cut through the weld until you see the seam which will appear as a crack. This is where the two pieces meet. The cut is on the weld with little damage or heat to the plates.
Seventy-five / Twenty-five – 75% Argon / 25% Carbon Dioxide, see SHEILDING GAS.
Shielded Metal Arc Welding – See also STICK WELDING. SMAW, is the process where we use ELECTRODES or RODS. Although some of the other processes are more efficient, there are some jobs where SMAW is the most practical, like climbing around on a high-rise office tower, shopping centers and large spread-out structures.
Shielding Gas – Gases such as argon or helium are inert, meaning they will not combine with other elements. This makes them good for keeping atmospheric contaminants out of the WELD POOL. Carbon Dioxide is not inert, but effective and used in MIG either by itself, or mixed with inert gasses such as 75/25.
Carbon Dioxide gives a deeper penetrating weld, while 75/25 gives a smoother appearing bead and less SPATTER than pure CO2.
Skip Weld – A sequence used to control warping (distortion). Once on a parking garage there were big beams made of concrete with steel gusset plates on each end to be welded to gusset plates on the columns. Concrete is never completely cured, it has moisture in it. If you get a cutting torch close to it, or excess heat from welding, it will blow up and send little concrete shrapnel shooting out like a dad gummed fragmentation grenade.
If we woulda' welded those plates solid, it would've blown concrete out from around the plate and weakened the connecting points big time.
So instead, we skip welded the plates. We'd weld a couple of inches at the top, couple at the center and a couple at the bottom. We'd let that cool, and then do it again until the plate was welded solid. It's all about keeping it cool dude.
Slag – when the FLUX on a welding ROD melts it produces the SHEILDING GAS to protect the weld, and then forms a hardened protective coating over the weld. This has to be chipped off and thoroughly cleaned, usually by brushing.
Slag Inclusion – If you don't properly clean the SLAG from a BEAD, you run the risk of it becoming part of the weld when you run the next bead. A good welder will generally burn it out on the next pass, but if not, there will be a chunk of slag in the bead which leaves a weak spot. Slag inclusions are one of the main WELD DEFECTS.
Slot – Slot welds are just like PLUG WELDS except instead of being round, they are elongated. (Long and narrow.)
Soapstone - A soft stone that is pretty much compressed talc which makes it excellent for marking on STEEL.
Solidus - A SMART TALK way of saying solid.
Solid Steel Wire - Mild steel MIG wire used for…that's right, welding on mild steel. If you're doing art work, you can use solid steel on stainless also. The welds will rust, but they will hold as long as there is no stress on them. You would NOT do that on anything structural as the weld is prone to cracking.
You can also use rolls of FLUX CORE (FCAW), STAINLESS STEEL (SST), and Aluminum (Al).
Rolls come in a couple of pounds, five, ten, twenty, thirty-three, and forty-four pounds that I know of.
Off the top of my head I'd say you can get wire rolls at your local welding supply store, some hardware stores, Loews, Home Depot, Harbor Freight, Northern Tools, and Grainger.
Spatter - When you weld, especially with the MIG process and 60 series RODS, the arc force blows small droplets of FILLER METAL out onto the surface of the PARENT METAL.
In MIG welding you want to either spray the inside of the nozzle with aerosol, or dip it into a gunky substance that coats the inside to keep the spatter from sticking. If spatter builds up in the nozzle, it will obstruct the flow of the Shielding Gas. If using nozzle dip, you wanta' heat the nozzle by running a few passes first or you'll just have a nozzle full of gunk.
If the spatter chips off easily, it's no big deal, if the spatter won't chip off, your temperature is too hot.
Also, if you are working on artwork or something that you really don't want spatter to get on, you can spray the PARENT METAL or spread the gunk on it and it will keep the spatter from sticking.
One of the stupidest/craziest/nonsensical things that happened in my teaching career was a student eating a glob of nozzle dip. It was nasty dirty from months of use, and out of the blue, he ate it. Luckily it was not toxic and somehow did not make him sick. When I asked him why he did it, he just looked at me with a weird smile on his face!
Spot Weld - Used on thin gauge metal like car bodies, you have a couple of prongs that grip the steel kind of like a pair of pliers. In between is a small glob (I like that word.) of FILLER METAL. The prongs shoot current through the steel melting the filler metal while firmly holding the steel together. As long as it's set right, it will melt the filler metal and make a very small, yet strong weld. If it's set too cold, the weld won't hold. If it's set too hot, it'll just wash the "glob" of filler metal away, or burn through the steel.
It's a good idea to use it on some scrap pieces of steel to get the AMPS right before doing the real deal.
This is a small
Stick Welding - See SMAW and http://keenovens.com/articles/stick-welding.htm.
Done with either electric powered, or gasoline/diesel operated machine. For heavy fabrication and construction in structural steel, DIRECT CURRENT is usually used because it runs smoother than ALTERNATING CURRENT.
One exception was when we used AC machines to run 6011 RODS at a black iron plant I worked at. Stiffening plates (plate put in the web of a beam to give it extra strength and keep it from sagging) that we routinely put in could be done with 6011 and it was cheaper using AC current. On most everything else there we used DC with 7018, or FLUX CORED ARC WELDING.
In the Iron Workers Union, I welded for years pretty much exclusively using 7018 RODS with DC. (7018 are also called Low Hydrogen or LoHi) About the only time we didn't use 7018 was when we were using 6010 RODS on decking. (We'd burn through the sheets on the roof into the joists below.)
Sticking - A heck of a frustrating occurrence when the rod sticks to the steel instead of starting an arc. It's usually caused by the heat not being hot enough, or the wrong ROD angle.
The end of the rod heats up just enough to fuse to the base metal without starting the ARC.
This frustrates the heck out of new welders and that's bad because they then grip the STINGER even tighter making it likely to again stick the rod. (You gotta' relax your hand when welding!)
If you jerk the stinger quickly enough, you can free the rod, otherwise you have to disconnect the stinger from the rod, and then break the rod free. (NOTE: Keep your hood down when disconnecting because it will make a bright flash.)
If FLUX breaks off of the end of the rod, you will need to "long arc" (hold the rod a quarter inch or so off of the plate and let it burn) until it burns the exposed FILLER METAL back down to the flux.)
Beginners should practice striking an arc over and over again to learn how to strike it without sticking.
Stick-out - How far the wire sticks out from the end of the NOZZLE in MIG welding.
Stinger - What we call the ELECTRODE HOLDER in the shop or field. In SMAW there are several sizes of stingers, from lightweight, to heavy industrial sized. In the field we would connect the WORK LEAD on a column for completion of the circuit which allowed us to only drag the stinger lead to where we were welding. (As long as the structure was steel.) It's a heckuva' lot easier doing that than dragging both leads, especially working up high walking around on narrow beams!
Stringer Bead - The first bead you should learn after you master starting the arc. Depending on the rod or process, this bead will be done with a drag action on flat surfaces with little or no OSCILATION. After the first bead, the others are run parallel to the first.
For flat (see SURFACING) build up welds the beads will overlap each other. In other words, the bead should wash in to about the halfway point of the existing bead. That way there is a good TIE-IN making a connection of the two beads. After several of these are run, the top will be smooth if done correctly.
See also CRATER and OSCILATE.
Submerged Arc - When I was attending a welding school long, long ago, we toured a massive steel plant. What I saw with them melting down the iron in huge blast furnaces, blowing out drain holes with dynamite, bright orange molten steel flowing into different forms, and all the major machinery, was awe inspiring!
So I see this guy sitting by a big machine just kind of watching it with a cig hanging out of his mouth. I asked what he was doing and he politely said "What the hell does it look like I'm doing? I'm welding!"
"But there's no arc." I replied.
In a mean, sarcastic, cuss-word filled voice, he told me how they use a bare ELECTRODE set with flux spread out on top of the steel. The flux cover kept the arc from being seen, so all he did was set the machine, then sit there and make sure it was working right. It's a very good process for long, continuous welds.
Surfacing - Welds used to build up worn down equipment to its original form. A good example is a bulldozer. On the back is a sprocket to make the track go forward or backward. Wheels at the bottom and a few on the top keep it in line. At the other end from the sprocket is an idler wheel. Its purpose is to keep the track in place as it continuously rolls.
All of these wear down with use and it is way cheaper to re-surface these welds rather than buy the new equipment, especially for large shops and jobsites.
So a build up weld is done, usually with a hard surface rod which does just that; it adds steel and alloys that are very hard so that they don't wear down easy.
My first welding job was doing surface welds on idler wheels. I sat there and slowly spun the wheel, running the rod back and forth, about 4" left to right.
We started at
But you gotta' start somewhere, and by sitting there doing a weave pattern over and over, day in day out, I learned to run a really good continuous bead, so it was a good start.
Tack Weld - Small weld used to hold what you're welding on in place until you weld it solid. Used extensively in fabricating, tack welds can be easily broken off if a change needs to be made.
It's REAL important that you make sure to weld ALL points on something that has been tacked, especially if it is going to be used structurally.
One time a fabrication guy welded a "dog" (temporary lifting eye to hook the shop overhead crane to) on a set of stairs to lift them a few inches off his table. He forgot to take it off and it shipped out with the dog still in place.
When it got to the field, an unknowing rookie hooked it on and up it went. On something like that, you tack only on one side so you can knock it off when you're done. That was plenty for the shop, but with it swinging in the air the tacks broke loose and the stairs fell about 26 floors to the ground.
Miraculously no one was hurt, but the job superintendent yelled so much it nearly melted the poor shop foreman's phone that day!
Make sure to burn completely into a tack when welding, and don't start or stop a weld by or on a tack.
Tee Joint - When flat, two plates put together where if you turned them upside down, they'd look like a T. Hmmm…I wonder if that's how they got their name?
Temper - Some steels can be hardened by heating, then quickly quenching. When our chipping hammers get dull we sharpen, then temper them.
Using a cutting torch, we heat them to what's called "cherry red" (orange to me), then stop and let them began to cool until they're a dull orange. (It's important to keep the tip of the torch a few inches away to make sure it doesn't melt or scar the steel.)
Then we quickly dip it into a bucket of mineral oil to quickly cool it. Water will work also, but not as good, and you need to make sure it is cool or cold.
After that, you've got a re-hardened hammer.
After use, the crystal structure in the steel changes. In hard steel, the crystals are small and close together. In softer, more ductile steel, the crystals are longer and further apart from each other.
When the hammers are exposed to heat and constant beating, the crystals elongate and the ends get dull. We heat them making them flexible and taking the stress away, then cool them quickly which causes them to contract.
Your pocket knife blade is very hard steel with a high carbon content, which holds an edge well. If you were to sharpen it on a machine bench grinder and allow it to heat up, it will no longer keep a good edge because you change it's make up.
Temper is also something that my boss' lost when I was a wiseass to them.
Tensile Strength - Welding RODS such as 7018, 6010, etc. are rated in tensile strength per square inch. The first two numbers tell the tensile strength in thousands. (A low-hydrogen 10018 rod would be the first three.)
7018 has 70,000 pounds of tensile strength per one square inch of weld. 6010 would have 60,000 lbs. That is a lot of strength for a little amount of weld!
Tensile strength is the ability to resist being pulled apart by TENSION. Strength is measured at the point it takes to bring the steel or metal to its fatigue point where it fatigues and tears apart.
I do a demonstration where I TACK WELD a 6" X 6" plate to the end of a table placing only ½" of weld at each end of the top side with 7018.
I then ask students if they would stand on it if it were 30 stories in the air. Most say they wouldn't so I climb up on the table and do that stupid crane stance from the Karate Kid standing one legged on the plate.
It shows how much tensile strength two small tacks have, easily supporting my weight.
p.s. Don't tack a plate 30 stories high and do the crane stance! It's for demo only!
And by the way, when we tacked our welding baskets to stand in working up high, we were always tied off with a safety harness before we got in them!
Tension - Pulling taut or stretching with force. A good example is a rubberband. Tension is where you stretch it apart.
Also the kind of headache I used to get when I worked up high and looked down.
Test Coupon - I've written about how welders have to prove themselves more than any other trade or career. This is done either by a destructive test that destroys the steel, or a non-destructive test such as x-ray. This is how you become a "certified" welder.
On a destructive weld test in structural welding a GROOVE WELD is made with either an open ROOT, or using a BACKUP STRIP. Both sides of the plate are ground flush and cut into 1 ½" strips which are bent in a JIG.
The strips are then checked for cracks, or other defects. If none are found, you get the job, fail and down the road you go.
Usually two strips from the ROOT and two from the FACE will be bent.
Sometimes the strips will actually break in two pieces. If this happens, you might want to check out another career or get to practicing!
Throat of Fillet Weld - This excellent site from TWI shows various fillet throats.
Tie-in - After running a STRINGER BEAD a tie-in is made when another stringer bead parallel to the first, is burned halfway into it. Instead of them being two beads side by side, they are intertwined together. Ahhh…they have become one Grasshopper.
Tie-in is very important to give strength when making multiple pass welds.
TIG Welding (GTAW, Gas Tungsten Arc Welding) - Was called Heliarc, then Tig, now GTAW. However, most welders out in the field still call it Tig. If they call it Heliarc, they're old. WAIT a minute…I've called it Heliarc!!!
This welding process joins metals by heating them with a non-consumable tungsten electrode. That means the electrode, which is TUNGSTEN, doesn't melt into the weld the way filler metal in a ROD does.
In STICK WELDING the ROD is being consumed as you weld. As you're burning into the steel, the rod is melting so you need to be pushing into the steel as you go to compensate for the end of the rod being consumed, which makes it shorter.
In Tig you hold the tungsten the same distance from the PARENT METAL as you weld because it is not being consumed.
It can be done by melting two pieces together with no filler metal, or with a filler rod that you hold and feed into the weld.
It takes a lot more skill and patience to Tig weld because you use both hands for different functions and have to feed the rod correctly. That means a lot of coordination, so if you can't walk and chew gum at the same time, it's gonna' take a LOT of practice to get it down.
Basic beads are relatively easy, but out of position, exotic metals, pipe and tubing, and confined spaces can be very difficult, and take a long time to master.
That said, if you are going to use it for hobby type, working on your race car, motorcycle etc. don't let it intimidate you. With practice you can become proficient.
It uses argon, helium or mixtures of inert gases for shielding the weld, and with little to no smoke produced; it is very easy to see the WELD POOL. (Except for Aluminum where the puddle is fairly hard to see.)
Tig Torch - Made up of a head to protect the tungsten, collet (sleeve to hold the tungsten) collet body (that's right, it holds the collet), TUNGSTEN and a ceramic cup. The tungsten carries the current which produces an arc. Orifices in the collet direct shielding gas to flow out of the ceramic cup and surround the WELD POOL. Different people hold the torch different ways. I don't care how you hold it as long as you're relaxed and the weld comes out ok! Some torches are air cooled, while others use water or anti-freeze. If you use a liquid cooled torch, you better be real careful not to set it down on a hot piece of metal. Spring a leak and you could get shocked real bad with DC and if you're using AC, you could wake up dead! The smaller the torch, the faster it gets hot.
Tungsten - This stuff is hard! It also has the highest melting point of any metal, with only the element carbon having a higher one. This makes it a good ELECTRODE to use in TIG. It is non-consumable whereas stick electrodes are consumable. They burn up as you use them, tungsten doesn't. It carries the arc and makes heat for FUSING the steel. See TIG.
If you want to pull a good ask for Wolfram. That is the original name for tungsten because it is mined from ores, one of 'em called Wolframite. After they ask what the heck you're talking about, explain and act surprised at their limited metallurgical knowledge.
Undercut - This is the CARDINAL SIN of welding grasshopper! Cutting into the steel with the force of the arc leaves a cut out groove in the weld. If this is not filled back in with filler metal, it leaves a WELD DEFECT which is a weak point that can cause the joint to fail. This can cause property damage, injury and even loss of life. See WELD SIGNITURE.
Underfill - is a weld DEFECT that happens when you are not depositing enough FILLER METAL according to the welding specs.
Underwater Welding - I'm very tempted to put "welding under water" here. It is either done actually in the water, or in a hyperbaric chamber which is a submersed room where the water has been pumped out. If done in the water it is usually for an emergency repair because there is no way to make a good looking weld underwater, although you can make one that will hold.
Here's a site with a great paper on the subject…
There are several schools for underwater welding located in different areas of the nation. Two good ones I know of from visiting or researching are
and There is also one in
Visual Inspection - is the easiest and most fundamental WELD TEST. After the weld is made, a qualified instructor, inspector, foreman, superintendent etc. will examine the weld by carefully looking at it. It will be checked for the "Cardinal Sin" of UNDERCUT, POROSITY, UNDERFILL, etc.
It only shows the surface, not what is inside. However, you can pretty much see if someone knows what they are doing by visually inspecting their welds.
Voltage - is the force that makes the electrons flow through the conductor. (Make sure you don't become a conductor by always wearing gloves when you weld, and staying dry!) It's kind of like when you turn on your garden hose. The water flows because it is pumped. The pump is like the volts, and the water is like the AMPERAGE.
Warping - is when the steel deforms either by twisting, bowing, or bending because of heat from the weld. Not usually a problem with thick steel, but a MAJOR problem with the thin stuff.
There are steps you can take to prevent warping such as putting the steel in a jig, clamping it down, or immediately cooling it after it is welded. (Immediately cooling can not be used on some metals and alloys because it would make them brittle.)
Watch Your Eyes!!! - is what we yell out in our shop to let people know we are about to strike an arc. You should always let people know before you strike an arc so they don't get FLASH BURN.
Weave Bead - is usually used on the last bead, or cap of the weld. It is made when you OSCILLATE the rod in a wide pattern back and forth, and in my experience done mostly with 7018 RODS.
Weld - although there are many definitions, the one I like is the bonding or fusing of two materials. It can be done with or with out filler rod or wire, and can use all kinds of crazy processes such as explosive, pressure, laser, and others. My late, non-mechanical brother used to ask me if I was going to use "jumper cables and sparklers" when I was STICK WELDING. Many people think of a welder as some dirty guy standing there with a cig hanging out his mouth. In some instances, that's the way it is, but there are MANY welding Processes out there, and new innovations being discovered all the time. You could be working dirty as heck on some greasy conveyor belt system, dangerous as heck way up in the air on a high-rise, or in an absolutely clean, air conditioned and safe aerospace shop. Welding is a heckuva' diversified trade.
Weldability - is if a metal or steel can be welded, and with what process?
Weld Blanket - Used to keep sparks, molten steel, and SPATTER from burning, scarring, or catching surrounding area on fire when welding or cutting. They're made out of material with a very high resistance to heat.
Weld Defect - UNDERCUT, POROSITY, SLAG INCLUSION, and UNDERFILL are all defects which can adversely affect a weld usually causing a crack which weakens it. Weak welds can damage equipment or materials, injure or even kill.
Weld Electrode - see RODS.
Weld Face - is on the opposite side of the ROOT OPENING at the top of the plate. It is where the CAP pass goes.
Weld Gauge - Comes in different sizes and is used by the WELDING INSPECTOR to check the size of a weld. Measures how much FILLER METAL is deposited from the ROOT OPENING to the WELD FACE.
Weld Gun - In STICK WELDING we use an ELECTRODE HOLDER which is called a STINGER in the field. When FLUX CORED, or MIG welding we use a gun with a trigger on it. When you pull the trigger it causes the wire to feed and activates the electric ARC.
Weld Joints - Lap, Butt, Edge, Corner and Tee are the five basic weld joints. Beer and Strip are also a couple of joints many welders know of.
Weld Metal - is the melting together of the FILLER METAL (ROD or Wire) and the melted PARENT METAL which forms the welding bead.
Weld Pool - see WELD PUDDLE.
Weld Positions - in structural steel there's Flat, Horizontal, Vertical and Overhead.
Fillet welds are done on a Tee Joint:
1F = Flat Fillet, 2F = Horizontal Fillet, 3F = Vertical Fillet, and 4F Overhead Fillet
Groove welds are done on plate:
1G = Flat Groove, 2G = Horizontal Groove, 3G = Vertical Groove, and 4G = Overhead Groove.
Weld Symbol – is the design on a WELDING SYMBOL that tells what kind of weld you are to make. i.e. Fillet, Lap, Butt etc.
Welding Certification – papers showing what test/procedures a welder has passed. Many people put too much emphasis on being “certified.” You might be able to pass a test 100% in a controlled environment. That is a whole different ball game than making it 30 floors up in the air, with the cold wind blowing down your neck while standing on a 2” wide beam!
There are many different certifications and several different institutions that offer them such as…
- American
Welding Society – structural steel.
- American
Society of Mechanical Engineers – boilers and pressure vessels.
- American Petroleum
Institute – oil and gas pipelines
Welding Symbol – (see also Weld Symbol) - Shows what type of weld, where it's gonna' be, the size and dimensions.
It has an arrow that points to where on the joint the weld will be, a reference line where the WELD SYMBOL is, and a “tail” for information on the weld itself.
Welding Technique – is how you make the weld. There are different techniques for different welds. For STICK WELDING using 6010 you OSCILLATE the ROD in either circles, or a “whip and pause” where you are whipping the rod in and out of the WELD POOL. This is a radical technique compared to 7014 which you drag steadily with little ossicalation.
Some instructors will insist you use ONLY their technique. I don't care if you stand on your head gargling peanut butter as long as you get the weld right. If your technique makes for a sound weld, then it is fine by me.
Wire Brush – A real important tool for both pre and post-cleaning a weld. In welding “Cleanliness is Godliness” ESPECIALLY in Mig welding. Mig doesn't work worth a dang if there is paint, rust, or dirt on the metal. Although STICK and FLUXCORE can burn through some paint, rust and dirt, it is still preferable to have a clean surface if at all possible. The cleaner the surface, the better your chance of a good, pure, sound weld.
There are hand brushes, brushes that fit on hand grinders, and brushes that fit on bench grinders.
After running a pass it is important to brush it good, especially if you are going to run another pass over it.
If you are showing your weld to your instructor, or turning it in for a certification test, it is in your best interest to clean the weld properly. The better you clean it, the better it'll look!
Weld Procedure – The AWS sez a weld procedure is "the detailed methods and practices including all joint welding procedures involved in the production of a weldment." When I first started welding and I read definitions like that I was like “What the? Who the? Where the? Are you freaking kidding me?”
So here's my translation…”how you're gonna' do the weld.”
Blueprints have weld procedures which tell what kind of process, and what number, thickness, width and length of the weld is required.
On a big job, the superintendent will go over the weld procedures with the general foreman, who will go over it with the foreman, who will go over it with the welder.
In a shop the foreman will go over it with the welders.
Weld Puddle - or WELD POOL, is the molten metal produced while the weld is being made. It can be made from melting the PARENT METAL alone, the PARENT METAL combined with FILLER METAL, or mostly FILLER METAL in SURFACING.
It needs to be protected from atmospheric contaminants by a gas shield produced either from the flux of an ELECTRODE, or SHEILDING GAS.
Weld Size – Yes grasshopper, in welding size DOES matter. The size of the weld is located on the WELDING SYMBOL and should not be any more or less than what it calls for.
Weld Symbol – is on the WELDING SYMBOL and tells what kind of weld is going to be made. A good site I found illustrating this and welding symbols is
Weld Test – There are Visual tests, Destructive tests, and Non-Destructive tests in welding. In welding you have to prove yourself more often and in harder ways than any other trade.
Visual Test - See VISUAL INSPECTION.
Destructive Test – In structural welding two plates welded together are then cut into coupon strips usually 1 ½” wide. The FACE and ROOT OPENING sides of the plate are grinded flush.
They are bent in a jig, two face sides, and two root sides, and if they bend with no cracks or POROSITY, or SLAG INCLUSION, you get the job.
Photo from
If they have cracks, porosity, or slag inclusion…head on down the road.
Non-Destructive Test – is used when it is impractical to do a destructive test, or to get a complete view of the weld. There are several types such as X-ray, Magnetic Particle, Ultrasound, and Liquid Penetrate Dye tests.
X-ray shows pretty much EVERY part of the weld. If there is ANYTHING at all wrong, it is gonna' show up! Welds done to X-ray codes have zero tolerance. That means you better weld it perfect EVERY weld, EVERY time!
In my years as a structural welder in the Iron Workers union I tested on jobsites with Destructive Bend tests, or X-ray. There are many other tests done, but here I'm only describing these two. You can find more on the other testing methods in most any welding journal, or search ‘em on the net.
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