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Topic: 4G Weld (Overhead Groove Weld) 1. Quick Definition (User Summary) A 4G weld is a groove weld performed in the overhead position . The weld axis lies roughly horizontal, but the weld face is on the underside of the joint, requiring the welder to deposit metal upward against gravity. It is considered one of the most difficult positions due to the risk of molten metal dripping.
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