Fixing Cold Lap and Lack of Fusion Defects
Cold lap occurs when the weld metal doesn't properly fuse with the base metal or previous pass, typically from insufficient heat input or improper technique. Solutions include increasing heat input, adjusting travel speed, and proper joint preparation.
Solution Steps
- Increase heat input. Raise voltage or reduce travel speed to ensure proper melting of base metal.
- Improve joint access. Ensure proper torch angle and position for good wetting action.
- Clean joint edges. Remove any oxidation or contamination that prevents fusion.
- Adjust gas coverage. Ensure adequate protection without excessive flow that cools the weld.
Recommended
CORGON® 25
High Heat InputWhy CORGON 25 helps with fusion: Higher CO2 content (25%) provides increased heat input and better penetration characteristics, improving fusion in difficult joint configurations.