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electrons form electric arc, deep weld is also called deep penetration, direct current electrode negative refers to negative electrode, direct current electrode negative refers to positive welded part, positive welded part becomes very hot, negative welded part works at lower temperature, direct current electrode negative flows in one direction, direct current electrode negative facilitates deep weld, negative welded part attracts positive gas ions, positive welded part receives a deep weld, cleaning means oxide removal, direct current electrode positive refers to positive electrode, direct current electrode positive refers to negative welded part, alternating current is changing polarity, 3 current types are direct current electrode positive, 3 current types are alternating current, 3 current types are direct current electrode negative, negative welded part receives a shallow weld, positive electrode becomes very hot, electrons attracts positive electrode, negative electrode works at lower temperature, direct current electrode positive facilitates oxide removal, direct current electrode positive is also called reverse polarity, changing polarity enables both deep penetration, changing polarity enables both cleaning, direct current electrode positive flows in one direction, direct current electrode negative is also called straight polarity, positive gas ions cause cleaning, electrons attracts positive welded part, negative electrode attracts positive gas ions, negative electrode emits electrons