Welder Red Seal · Question
A welder is fabricating a pressure vessel component using FCAW-G with an E70T-1 wire. The procedure specifies a minimum preheat of 100°C (212°F) and interpass temperature of 200°C (392°F). During welding, the welder notices some solidification cracking in the weld crater. What is the most likely contributing factor?
Rapid cooling rates after welding, especially in the crater area where the molten puddle solidifies last, can lead to solidification cracking due to thermal str
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Question: A welder is fabricating a pressure vessel component using FCAW-G with an E70T-1 wire. The procedure specifies a minimum preheat of 100°C (212°F) and interpass temperature of 200°C (392°F). During welding, the welder notices some solidification cracking in the weld crater. What is the most likely contributing factor?
Answer options:
- Using direct current electrode positive (DCEP) polarity.
- Maintaining the interpass temperature too high. ✅ Rapid cooling rate after welding a pass.
- Insufficient wire feed speed.
Correct answer: Rapid cooling rate after welding a pass.
Explanation: Rapid cooling rates after welding, especially in the crater area where the molten puddle solidifies last, can lead to solidification cracking due to thermal stress and shrinkage. High interpass temperature would slow cooling, and polarity or wire feed speed are less direct causes of solidification cracking.
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