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I have a BOC 250R MIG welder and need to change polarity on it for flux cored wires is it as easy as swapping the leads on it or is there another option.

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Yes, swapping leads will reverse the polarity....

heatman101

Posted on Sep 14, 2010

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If you are using flux core wire you need to switch the polarity of the machine. With flux core wire, your ground clamp becomes positive (lead) and your gun the ground. All you need to do is switch the cables above the feed rolls.

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If this was useful to you, please vote. Thanks.

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