Good input and advice- nice to know MIG is recognized as a AWS code process-right settings and wire dia. and shielding gases- MIG will penetrate for root pass as well as SMAW (stick electrode). Any metal, ferrous or non-ferrous can be welded with the TIG process. But let's remember here the critical temps- silver solder, brazing, then welding, even with the "Blue Tip Wrench"- and filler rod. A sprak test of the parent metal that fractured, and an analysis of the mating parts in the mechanism that may have caused the fracture might also be in order. I love to shoot barn pigeons-best practice bird going- "Airborne *&^%wagons"- I often find my dead birds (I pick them up as I do my empties-the birds go into the farmer's "Turd Hearse- aka- manure spreader--with those leg barns-must be hold overs from the WW1 messenger pigeons. Now if we only had a legal dove season--