What Jburry said is very true. Thats also why I said what I did where even with a substantial investment in machines, I could not weld thease tiny parts! As good as I am with my TIG machine on aluminum and stainless, I could not weld those little parts. Maybe others could with speciaized equipment, but not me. (I also didn't used to be a weldor. I am one. I have my own shop, and run 2 portable rigs.) The chance of anyone here reading this,...that is NOT specifically in the business of welding that thin of material, is dreaming if they think that they can. Buying a TIG machine will relieve you of a thousand dollars + , and ya still won't be able to accomplish what you want any time soon. I would pay close attention to the guys that are doing what you want to do! In my PROFESSIONAL opinion ,,, soldering in some form or another is about the best a modeler can do.,,,,,damn....I said that already didn't I? [X(]

Edit; BTW, Any machine that you choose will come equipped with the regulators and lines required. The GAS bottle is a seperate investment on your part as is re-filling it. The "consumables" gas, wire, rod, tips , whatever, are NOT included. Thease you will have to buy before you strike an arc! Aluminum for example requires a differant INERT gas than does steel. This gets EXPENSIVE real quick.
Do yourself a favor and call a local welding supply house and ask some questions. I love it when some guy heads to Home-Depot, buys a machine, and after running some wire or burning some rod, actually thinks hes a weldor! Just blows me away!