Welder Red Seal · Question
During a routine visual inspection of a newly fabricated pressure vessel, you observe a continuous groove at the toe of a butt weld, extending into the base metal. The groove measures approximately 0.5 mm deep and runs for 50 mm along the weld. Which of the following discontinuities are you observing?
A continuous groove at the toe of a weld extending into the base metal is the definition of undercut. Overlap is when weld metal extends beyond the toe without
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Question: During a routine visual inspection of a newly fabricated pressure vessel, you observe a continuous groove at the toe of a butt weld, extending into the base metal. The groove measures approximately 0.5 mm deep and runs for 50 mm along the weld. Which of the following discontinuities are you observing?
Answer options:
- Overlap
- Porosity ✅ Undercut
- Crater crack
Correct answer: Undercut
Explanation: A continuous groove at the toe of a weld extending into the base metal is the definition of undercut. Overlap is when weld metal extends beyond the toe without fusing, porosity is internal or surface gas pockets, and a crater crack is found at stops in the weld bead.
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