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How to prevent incomplete penetration

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How to prevent incomplete penetration

1. Control the groove size: gap, blunt edge, angle and wrong mouth, etc.

2. Control current, polarity and welding speed; make the joint fully warmed up and build the first molten pool

3. Control electrode diameter and welding angle; overcome arc blow

4. Double-sided welding must be thoroughly cleaned

5. The oil, rust, slag and scale on the groove and the blunt edge must be cleaned up.

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