Welder Red Seal · Question
A welder is visually inspecting a freshly completed fillet weld on a structural steel component. They notice that the weld metal does not extend fully into the root of the joint, leaving a distinct, unfused area at the bottom. What is this discontinuity most accurately identified as?
Lack of fusion occurs when the weld metal fails to fuse completely with the base metal or with previous weld passes, commonly seen as an unfused area at the roo
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Question: A welder is visually inspecting a freshly completed fillet weld on a structural steel component. They notice that the weld metal does not extend fully into the root of the joint, leaving a distinct, unfused area at the bottom. What is this discontinuity most accurately identified as?
Answer options:
- Undercut ✅ Lack of fusion
- Porosity
- Overlap
Correct answer: Lack of fusion
Explanation: Lack of fusion occurs when the weld metal fails to fuse completely with the base metal or with previous weld passes, commonly seen as an unfused area at the root or between weld beads. Undercut is a groove melted into the base metal adjacent to the toe or root of a weld and left unfilled.
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