Which term describes electrode negative polarity in GTAW?

Which term describes electrode negative polarity in GTAW?

• A. Direct Current Reverse Polarity
• B. Direct Current Electrode Negative
• C. Alternating Current High Frequency
• D. Direct Current Electrode Positive

Answer: (B)

Polarity in GTAW determines which terminal is negative and where most heat goes. The term for electrode negative polarity is Direct Current Electrode Negative. With this setup, the electrode is negative and the workpiece is positive, so most heat is delivered to the workpiece, giving deeper penetration and less wear on the tungsten. The opposite polarity, Direct Current Electrode Positive, puts more heat into the electrode and produces shallower penetration with faster tungsten wear. Alternating current high frequency refers to using AC with a high-frequency signal to stabilize the arc, not to a specific polarity. Direct Current Reverse Polarity would describe the opposite of electrode negative (electrode positive).

Polarity in GTAW determines which terminal is negative and where most heat goes. The term for electrode negative polarity is Direct Current Electrode Negative. With this setup, the electrode is negative and the workpiece is positive, so most heat is delivered to the workpiece, giving deeper penetration and less wear on the tungsten. The opposite polarity, Direct Current Electrode Positive, puts more heat into the electrode and produces shallower penetration with faster tungsten wear. Alternating current high frequency refers to using AC with a high-frequency signal to stabilize the arc, not to a specific polarity. Direct Current Reverse Polarity would describe the opposite of electrode negative (electrode positive).