tig can weld anything that will conduct and melt, metals that is, never tried brass, use a torch for that.
If you stick with a MIG and get the bottle with a steady hand it will look great. Flux core is good only to slap a couple items togther heavy steel. But you can do it. going from a stick to a Mig makes you think you can weld anything, but going from a mig to a tig will make you thiink you died and gone to Nirvana.
Stick = big pieces of metal
Mig = slightly smaller to sheet metal 22 ga stuff
Gas = all the above
tig = paper thin to what can you toss at me within reason. And yes I can weld that pipe to Nuclear Certification level. But then I don't have that talent to do that, so I will stilck with Mig or Tig and sheetmetal repair.
Luckly I live one town over from Troy, Ohio so my Licoln is over in Troy as of tonight getting fixed by a guy that works for Hobart. And then I will have it back, I really need to pickup ectra parts for it and hope it stays togther it has servered me well, 3 914s, a couple boats, tractors, vans and just make this or that. 5 years it finally blew, not bad considering the amount of welding I do, it was by far my most used power tool.
Oh it is a 110V model but I run it off a 220 circuit 50 amps, and split the leags to make it 110, never had it bog down once. but I don't even think of running it off an extension cord.