If you plan on welding exotic materials and lots of very thin aluminum they are grate. But if you plane on mostly steel and occasional aluminum I stay away from one. I Really dislike welding steel with these machines they tend to have a hard time staring an arc on steel compared to a sincrowave or other none inverter machines. Plus the dynasties have so much adjustment you really have to know what you are doing to get one setup correctly.
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Brian
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