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Here's my experience:
In college, I sent significant time building a formula SAE car ... learned MIG and TIG along the way. Was eventually able to TIG an aluminum fuel tank (needs to be leak free). Never a PRO ... PRO's have years of experience ... you will never achieve that level ... deal with it!
After college ... bought a 110V Lincoln MIG (gas) to do sheet metal work on the restoration of a Datsun 1600 ... 110 is good for that ... but nothing structural.
Later in life ... bought a 220V Miller MIG (gas) to build a lotus 7 replica .... my unit has auto voltage adjust for us non-pro's ... this is worth a million $ and is also a good reason to buy new.
Also ... please speak to your local welding store about Argon vs. CO2 vs. an Argon /CO2 blend ... the latter may be the best universal answer.
And ... for get all prior comments about welding stainless ... done properly, it is beyond the non-pro ... needs high skill plus back-purging
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