either of those welders i mentioned will be just fine for that application. they both use flux cored wire as well so if you dont want to spend money on gas for mig, then you can just use self sheilding wire and weld it with that. the only problem is that you will have to clean off the residue before you paint it or anything and the weld wont be as clean as mig. but anyways, to answer your question, both the machines will work and the lincoln is around 450 whereas the miller is 550-600. both will need gas for mig welding.