what does polarity do

by Michael Timm
(Stillman Valley, IL)

On my Millermatic 115 you can reverse the polarity what is this feature used for


bare wire mig requires dcep (reverse polarity) but some flux core wires require dcen ( straight polarity). you can look up the maker of the flux core wire and find a data sheet that lists the correct polarity....its a big deal too.

flux core that is designed to weld on dcen will run like crap on the wrong polarity

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