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Mig is by far the easiest, and most cost effective to get in to.You will need to get a real mig with the gas setup, the flux core welders are cheap, but don't make as clean a weld, plus with the gas, you can weld light aluminum ( although you will need a different gas bottle and a few other goodies )
Best to go with a decent used name brand unit that you can get parts for easily, those harbor freight etc type units could leave you high and dry.
You may want to check out some welder manufacturer sites, a lot of good information, and most of it more useful than the 2" thick text book you get with the class.
I took welding classes 20 some odd years ago and learned gas and arc, but quite frankly, those classes aren't setup for a hobbyist trying to learn how to do basic operations, they are setup with the assumption that they are teaching you to be a production welder , and spend an insane amount of time on things you'll likely never need. If you are halfway decent about learning from reading, you might just want to get some equipment and some scrap metal and see how far you can get on your own ( DO pay close attention to all safety precautions ).
I recently, FINALLY got my own mig setup and I wonder why I waited so long. It is a real joy to work with, and much less artistic skill needed than with the other types and working overhead with it is a real treat.
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-------Robert, '93 940t, '90 240 wagon, '84 240 diesel (she's sick) , '80 245 diesel, '86 740 GLE turbo diesel, '92 Ford F350 diesel dually
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