If you look I use a spool gun wire feeder. Remember aluminum does not change color like steel so you have to be very careful. It's not that hard once you have the welder set, temp and wire speed. I use 100% argon. Your sheet must be clean and use a stainless steel wire brush.
Thanks HQ It's a lot of work I tell you. So hot my consuons gets soaked. Really HQ what do you think? You like it?
Hq it's French for under ware.