What's a good intro welder for subframe connectors?

I have a friend down the street who got the newer 125A HF mig. He welds EVERYTHING with it. Made a windmill, fenc/gate, implements for his tractor, etc. Hammer and nail sort of thing. it can go to 1/4 if you do it right. That said, as RRR said, flux is a stronger weld. Also, that HF unit will weld ANYTHING you care about on a uni-body car.