[inaforty]

I think you could possibly use a MIG weld to do both jobs. However you will not get a clean splatter free type weld like a TIG weld in stainless. Keep in mind that setting up a MIG weld to do both materials you will have 2 different types of gas mixes and 2 different wires (I'm pretty sure on this).

I think that the MIG process is actually easier with aluminum because the filler material is feed in mechanically (but I could be wrong).

I used my MIG welder for stainless last spring. I had to change the wire and gas mix to weld stainless. The work came out pretty good with good penetration but not very pretty with splatter. I made a support for the roof top dingy davit for the Rosborough.

I don't weld for a living but have a brother in law that is a high purity, X ray quality pipe welder/fitter.