Materials
Can you mig welding 4130 chromoly?
Quick answer
Yes — possible with ER80S-6-class wire. MIG on 4130 chromoly: match technique to the material; filler ER80S-D2, or ER70S-2 for less critical tube work.
The verdict and why
Possible with ER80S-6-class wire. Roll-cage and motorsport tube in Australia: preheat 150–200°C on thick sections and follow the rulebook for post-weld conditioning
Watch-outs
- acetone wipe, clean tungsten, tight fit-up
- Prep: acetone wipe, clean tungsten, tight fit-up