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MIG, ARC some TIG. Certified for MIG, Aluminum pipe, also MIG full penetration structural. Nasty test, dual shield 3/32 wire, 1 1/2 plate, one edge beveled, horizontal, inclined just enough so the weld will not fall out when making a pass. 3 root passes, 5 cover, wait 20 minutes, another 10 passes or so, let cool, finish welding. Not to mention all the chipping and cleaning after each weld. Did a lot of welding with 7018 and Jet Rod. Never had to be certified for stick, though.

Mostly MIG and Arc myself. Couldn't never get the hang of TIG- just wound up burning up my gloves. I welded from the time I was 18 till I was 24 when I joined the Army. After the Army (2001) while living in N. Ireland I did a little stint doing some MIG welding for a small manufacturer in County Fermanagh. Like riding a bicycle (you never forget) except they had these new fangled hoods that I never had worked with- you could see through the shield when you weren't welding, then when you began to arc it went dark. I didn't realize at first that it had sensors and was reaching up and over something to weld and inadvertantly covered the sensors up- face shield was no longer dark. Scratch head, try again a couple of times. Blistered my eyes pretty good- a thing I had done exactly once when younger and decided never to let it happen again (pain is a good teacher) but that new fangled hood threw me. You live you learn.