What polarity is typically used with GMAW?

What polarity is typically used with GMAW?

• A. Reverse
• B. Straight
• C. Negative
• D. Positive

Answer: (A)

GMAW typically uses reverse polarity, where the electrode is positive (electrode positive, base metal negative). This setup concentrates more heat into the workpiece, giving deeper penetration and a stable arc for gas-shielded wire transfer. It also supports smoother deposition and better fusion when using solid wire with shielding gas, which is why reverse polarity is the common choice for MIG welding. Straight polarity (electrode negative) can be used in some specific situations or with certain wires, but it isn’t the standard for the typical GMAW process.

GMAW typically uses reverse polarity, where the electrode is positive (electrode positive, base metal negative). This setup concentrates more heat into the workpiece, giving deeper penetration and a stable arc for gas-shielded wire transfer. It also supports smoother deposition and better fusion when using solid wire with shielding gas, which is why reverse polarity is the common choice for MIG welding. Straight polarity (electrode negative) can be used in some specific situations or with certain wires, but it isn’t the standard for the typical GMAW process.