OH! You can overclock those welders for free!! I had one of those welders years ago. Well, a very similar rebadged version of that welder. There were two versions, a big one and a little one (they looked identical, but one had more amps). Turns out the good welder and the lesser model are the exact same welder, and you can easily unlock the extra amps.
I was a broke high school student I couldn't afford the good one, so I had to buy the poverty version. There's a plate that decouples the primary from the secondary which you operate by turning the handwheel. That's how you adjust the amps. There are two sets of holes to mount the transformer, and one set of holes won't let you pull the decoupling plate out all the way. That artificially limits the maximum amps. Just unbolt the transformer then reinstall it on the other set of holes. Congrats. You just gave yourself an extra 30 amps.
I think there's a 150 and a 180. Anyway check the bottom. See if there's an extra set of holes in the sheet metal for the transformer. You might be able to upgrade this welder even further.

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