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Originally Posted by 79T/A
I'm don't have any of the expertise that a lot of other members here have (In fact, I think a few of them do it for a living), but I'd have to say it really depends on the thickness of the metal you are planning to use. To the best of my knowledge, a tig welder is for thinner steel and aluminum (Body work). Arc welders, or stick welders, when used properly, lay down the strongest beads but mostly when used on flat planes (Don't weld as well upside down). The mig is pretty much the ideal all-around solution and the easiest to use (In my limited experience).
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im one of those who more or less weld for a living. i served my pipefitter apprenticeship for 5yrs, nearly all of which was welding. if you know what youre doing, you can weld with anything upside down. ive done both stick and TIG upside down, and am certified in both. how else would you get the bottom of the pipe welded? not many people know how to stick, since its best for thick, heavy duty metal, and it take alot more skill then just squeezing the trigger of a mig gun.
a mig would be the best all around, since set up properly, you can do both sheet metal and heavy metal, such as frames. you can do any trailer you want with a mig gun. my preferance would be to stick weld it, since thats how i did most of my training. a mig can also do aluminum, you just need aluminum wire, and make sure its spotlessly clean and pre-heated.
tig takes ALOT of practice and patiance. it can be used for any kind of metal, including stainless, but needs to be properly set up, ie: right volts, gas, filler wire, etc.