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The earlier and more affordable square wave machines are the way to go. They give control with the square wave with the arc stability of a good heavy transformer. You can score deals especially at auctions for tooling. I saw a 300 amp Airco sell for $240 recently with a couple of torches, pedal, cooler etc. Stick with a good brand so you can get service, parts and consumables. I have an older Miller Syncrowave 250 that works great for me. Good hunting.......
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