Quote:
Originally Posted by Irace86.2.0
TIG is what is used with chromoly cages, and many people use TIG to do mild steel cages. Having done both TIG and MIG, putting a MIG gun into tight spaces is not fun. Same for TIG, but the torch is smaller and easier to reach tight spaces, but it does require attacking the weld from both sides with the filler rod and torch. The heat is easier to manage, and the welds are better quality, but the time is night and day different, which is why I think they went with MIG for this, as it is for function over a show car, and it is so over-powered, chromoly is not needed.
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Chromoly is a totally different beast then mild steel. I don't work with many welded chromoly parts, just machined shafts out of 4140 that we have case hardened. TIG on mild steel is a waste of time unless you are working with thin tubing, and even then it's kind of a waste. You TIG for a few reasons, a big one being heat control. Chromoly is sensitive to heating and cooling so you TIG it.
Edit: Really any high carbon metal you want to be careful of heating and cooling when you are bringing it within its phase transition temperature or you start ending up with bad grain structures.