by Gunnibronco » Thu Aug 14, 2014 11:32 am
You can always turn the machine down. We use a 250amp 220v MIG welder at the body shop. We set it to heat level 1, 2 or 3 when doing sheetmetal. Set the welder up with .023 wire for bodywork & .030 for heavier work. If you do stitch welds across a panel, you will warp it, its almost impossible not to. Welding 1" at a time helps.
TIG puts less heat in the metal, but they are expensive & take lots of practice to get right.
180 amps will weld shock hoops & other structural stuff. When I was shopping for a welder, the owner of our welding shop said I should go a little bigger than necessary, because I'm not certified/trained structural welder. He recommended 210 amps, because it has more than enough power to do 1/4".
Just don't buy a 110v model, it will do the sheet metal, but frustrate you doing anything thick. There are lots of used 110v welders on Craigslist for a reason. When I was looking, there were lots of Lincoln & Miller 180s available used, but not many 210's. I'd shy away from a cheap welder (Just because I think you get what you pay for). A new 180 Hobart (made by Miller, but less expensive) are about $700, if I remember. I doubt you'll get the same reliability out of a $200 welder.
Then practice, practice, practice.
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