Using direct current electrode positive (DCEP) in GMAW tends to produce cleaning action.

Using direct current electrode positive (DCEP) in GMAW tends to produce cleaning action.

• A. True
• B. False
• C. Only at low currents
• D. Only with certain gases

Answer: (A)

Direct current electrode positive means the workpiece is negative and the electrode is positive, which concentrates more heat into the base metal and stabilizes the arc in a way that helps break down and remove surface oxides and contaminants. As the arc interacts with the oxidized surface, oxides melt or volatilize and are swept into the arc, effectively cleaning the metal surface before the filler metal is deposited. This cleaning action improves weld quality on imperfect surfaces, which is why using DCEP in GMAW tends to produce surface cleaning.

Direct current electrode positive means the workpiece is negative and the electrode is positive, which concentrates more heat into the base metal and stabilizes the arc in a way that helps break down and remove surface oxides and contaminants. As the arc interacts with the oxidized surface, oxides melt or volatilize and are swept into the arc, effectively cleaning the metal surface before the filler metal is deposited. This cleaning action improves weld quality on imperfect surfaces, which is why using DCEP in GMAW tends to produce surface cleaning.