Welder Red Seal · Question
When using GMAW in the short-circuiting transfer mode, a common defect is 'cold lap' or lack of fusion. What is the primary cause of this defect?
Cold lap occurs when the weld puddle flows onto the adjacent base metal surface without properly fusing with it. In GMAW-S, this is often caused by incorrect pa
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Question: When using GMAW in the short-circuiting transfer mode, a common defect is 'cold lap' or lack of fusion. What is the primary cause of this defect?
Answer options:
- Travel speed is too slow
- Arc voltage is too high ✅ Insufficient heat input to fuse the base metal edge
- Shielding gas flow rate is too low
Correct answer: Insufficient heat input to fuse the base metal edge
Explanation: Cold lap occurs when the weld puddle flows onto the adjacent base metal surface without properly fusing with it. In GMAW-S, this is often caused by incorrect parameters (voltage too low) or technique (wrong work angle) that results in insufficient heat at the toe of the weld.
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