A mig set up will do all of that and is relatively easy to learn. Get one with the gas shielding capability. You can weld thin material better with a gas shield as opposed to the flux core wire.

Oxy-Acetalene can also do both plus, you can braze with it. Helpful in making leak free joints when attaching plumbing fittings to the processor drum. Not as easy to learn as mig welding though.