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 to the root of the joint, creating a small, open groove at the toe of the weld. What type of discontinuity is this?
Underfill occurs when the weld metal does not extend completely to the surface of the base metal, leaving a groove below the intended height. Undercut is a groo
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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 to the root of the joint, creating a small, open groove at the toe of the weld. What type of discontinuity is this?
Answer options:
- Undercut
- Overlap
- Incomplete root penetration ✅ Underfill
Correct answer: Underfill
Explanation: Underfill occurs when the weld metal does not extend completely to the surface of the base metal, leaving a groove below the intended height. Undercut is a groove melted into the base metal adjacent to the weld toe, while incomplete root penetration refers to weld metal not reaching the root of a groove weld, not a surface groove at the toe of a fillet.
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