I only recommend MIG wire when TIG welding for someone just beginning. It helps you control your heat. And helps with learning to feed the rod quickly. But once you get things going, regular rod is preferable. I remember running out of small rod and one of my really good welders used something like .090 rod to weld 18 gauge and did not have any warpage issues. But he knew how to control is heat. See he is using bigger rod the the material thickness, so it's easier to burn through the sheetmetal then melt the fill rod.
It is all about fit up and putting the least amount of heat in the panel and then learning how to fix what heat you do put in the panel. Once you get the TIG figured out, you will never do sheetmetal work with a MIG unless you have to. Some times you have to use the MIG if you can't get behind a panel.
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