Welder Red Seal · Question
Undercut in a weld is most often caused by which combination of factors?
Undercut, a groove melted into the base metal at the toe of the weld without filler metal, is commonly caused by excessive welding current (amperage), excessive
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Question: Undercut in a weld is most often caused by which combination of factors?
Answer options:
- Travel speed too slow and amperage too low
- Insufficient shielding gas coverage ✅ Excessive amperage or voltage and incorrect electrode angle
- Using a contaminated filler wire
Correct answer: Excessive amperage or voltage and incorrect electrode angle
Explanation: Undercut, a groove melted into the base metal at the toe of the weld without filler metal, is commonly caused by excessive welding current (amperage), excessive arc length (voltage), an incorrect electrode angle, or too fast a travel speed for the parameters.
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Question explanations
- A welder is fabricating a pressure vessel component using FCAW-G with an E70T-1 wire. The procedure specifies
- A welder is preparing to weld 20 mm (0.8 in) thick high-strength low-alloy (HSLA) steel using FCAW-G. The weld
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