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New Omnipro 220 digital welder issue

Moon Star

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Having some difficulty stick welding with my new Omnipro 220. Not getting a continuous arc. Arcs for about 3 seconds and no more arc. After a few times the welder shuts off. I'm welding 3/8" mild C-channel steel. I've tried both 3/32 and 5/32 7018 rods. Surface areas have ground to clean metal. I've varied the amps from 120 to 175 attempting to maintain a continuous arc. Approx 3 seconds of arc is all I get no matter the setting. Power to the welder is supplied by a new 10000 watt 220v generator with 50amp service with a built in digital volt meter. Starting to wonder if I got a defective welder?

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