GMAW is generally done with what polarity?

• A. direct current electrode positive (DC+)
• B. direct current electrode negative (DC-)
• C. alternating current (AC)
• D. pulsed DC

Answer: (A)

In GMAW, you want the arc to deliver ample heat into the weld area for good fusion and penetration, while keeping a stable, controllable arc with a smooth transfer of molten metal from the wire to the pool. Using direct current with the electrode positive (DCEP, also called DC+) places more heat at the workpiece and supports the common spray (or steady) metal transfer that MIG welding relies on. This setup gives better fusion and bead formation for most solid-wire MIG applications.

Other polarities exist for special cases: electrode negative (DCEN) can be used for different transfer modes with lower heat in the arc, AC is often used for aluminum to manage oxide layers, and pulsed DC is a technique to control heat input. However, for general GMAW practice, the standard is DC positive.