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Why is a welding machine AC or AC-DC?

AC ac-dc Machine welding
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Why is a welding machine AC or AC-DC?

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(top) A welding machine takes high voltage low amperage from the wall or electrical panel and converts it into low voltage high amperage welding current. The lowest cost machines are typically AC or alternating current machines. DC machines have a smoother output and certain types of electrodes such as the E7018 types of electrodes function better on direct current (DC electrode positive).

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