I tried tig welding for my first time today. It was on aluminum and that made things difficult, but I did manage to lay a good bead, as well as shock myself quite badly. The machine was a Miller Synchrowave 250, which can do everything. DC, AC (square wave and sine wave), MIG, TIG, ARC, etc... It's got so many dials and buttons, though. I don't think I could ever figure out what they all do. Anyways, it's pretty fancy and would be the only welder you'd ever need. I don't know what it costs and I don't think I'll want to know.