[widebody911]

I can weld 1/4 with my 1100v MIG, .030 wire and C25 gas. You need to pay attention to make sure you're getting penetration, and be prepared to grind and re-weld if you don't get it the first time.

As an aside, I experimented with welding aluminum this weeked, and also with using straight argon with steel. The aluminum test was a disaster - I either need to change the liner (which I have in my possesion, just didn't feel like changing it) or get a spool gun. The experiement with the argon went better - I got a much flatter, cleaner weld than with C25; I was cautioned that I wouldn't get good penetration, but with the .030 wire I could blow holes in 1/8" stock. The cost difference is negligble according to the guy at the welding store; I think I'm switching over.