When I was 15 in the mid 90's I bought a Lincoln 250a MIG welder for $600 and an old 300a Lincoln TIG for $300.
When I was 15 in the mid 70s, I learned on a (set of) Lincoln SA-200s. I think dad and grandpa had 8 of them. Rebuilt a few over the years. Super reliable, easy to work on. Back in the late 70s and early 80s MIG seemed super exotic / expensive to me, and was far too light for the water well industry. 1/4” wall or thicker was the norm for well casing, and we normally fabricated with 1/2” or larger.
Grandpa had one of those Lincoln tombstones in the shop, but I hated it.
Dad was always trying to cut time, and eventually bought a pair of Miller Big 40s to run casing using .045” or sometimes 5/64” flux core wire. Two guys would start on opposite sides the casing from each other and weld toward each other. This was faster, but meant very hot days under the hood in the desert, because changing rod (and the inevitable smoke break for most (not me)) was eliminated.
I bailed on well drilling and went into tech in 1986, so nearly 40 years now. While it’s been lucrative, I’ll just say that my opinion these days is that computers were a mistake.
Call me old-fashioned (or just old), but I’m on the side of single process machines.
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@Bump It Offroad we run a pair of Miller 252s, and they’re very reliable, though they’re starting to show their age.
In my tiny personal shop, I have a 1982 vintage Millermatic 35. (I think I have $700 in it. I think I picked it up on marketplace for $400, and replaced a few cracked insulators and bought a new gun for it.) Does everything I want, but I would like to learn TIG. Might get an old aerowave 300, or a syncrowave (if I don’t want to deal with the hassle of a EOL platform) when I get the urge. idk.