I've recently bought a 200 Square Wave Tig machine. My experience is limited with tig. I seem to be able weld mild steel OK, but 1/8" aluminum I'm trying to weld is a nightmare. I have it set on AC Tig and the other settings as the manual says to do. Buy the way Lincoln, your manual sucks. All I get is a funny fuzzy flame that doesn't melt anything. I cleaned the aluminum with a stainless steel wire wheel before welding. Any help is appreciated.