Materials
Preparing 4130 chromoly for welding
Quick answer
Prepare 4130 chromoly by cleaning acetone wipe, clean tungsten, tight fit-up. On this material, cleanliness decides weld quality more than machine settings do.
The prep routine
- acetone wipe, clean tungsten, tight fit-up
- Clamp or tack so the joint can't walk as heat goes in
- Check fit-up: gaps eat filler and heat control
- For multi-pass, brush and inspect between passes
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