This is a continuous, or intermittent, channel in the surface of a weld, running along its length, due to insufficient weld metal.
Common causes
This problem arises when there has been insufficient filler metal (current or wire feed too low or too high a travel speed) so that the joint has not been sufficiently filled. The result is that the thickness of weldment is less than that specified in the design, which could lead to failure.
Acceptance
Most standards will not accept this type of imperfection, except perhaps over short lengths and even then a smooth transition is required. The designer expects the joint to be adequately filled, but not too much so (see excess weld metal).
Often the presence of this imperfection is an indication of poor workmanship and could suggest that further training is required.
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