Is there any fact in this example welding scenario.; long welded seam for rear quarter replacement, utilizing TIG welding over MIG welding due to the MIG weld exhibiting more show though upon finishing , due to the MIG welds hardness vs adjacent metal /shrinking /expanding ?
No, there is no fact.
At the end of the weld, it depends on who is running the welder. Someone who doesn't know what they are doing can warp any panel with any welder.
As for pinholes in MIG welds, again, that is the person running the MIG, not the process's fault.
If anything, the MIG is faster which should produce less distortion.
I just picked up a Multimatic 220, so, I can do both processes.
