Welder Red Seal · Question
A welder is visually inspecting a freshly completed fillet weld on a structural steel component. They notice a continuous, shallow groove running along the toe of the weld. What is this discontinuity most likely to be?
Undercut is a common weld discontinuity characterized by a groove melted into the base metal adjacent to the toe or root of a weld and left unfilled by weld met
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Question: A welder is visually inspecting a freshly completed fillet weld on a structural steel component. They notice a continuous, shallow groove running along the toe of the weld. What is this discontinuity most likely to be?
Answer options: ✅ Undercut
- Overlap
- Porosity
- Incomplete fusion
Correct answer: Undercut
Explanation: Undercut is a common weld discontinuity characterized by a groove melted into the base metal adjacent to the toe or root of a weld and left unfilled by weld metal. Overlap involves the weld metal flowing over the surface of the base metal without fusing to it, while porosity appears as small spherical or elongated voids within the weld metal. Incomplete fusion describes a lack of coalescence between the weld metal and the base metal or between adjoining beads.
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