Quote:
Originally Posted by blu808
Use minimum heat input when welding 4130. It gets brittle if you input to much heat, and starts to carbon scale. Also allow to cool slowly. In the aerospace industry they usually heat treat the entire welded piece after welding, just to reduce the possibility of cracking.
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Thanks for the info.
I've just been running 50amps for .049" tubing and it seems to be fine so far.
Me and the other guy welding at school were going to heat up the welds with oxy and let it cool down naturually.