What is the correct pole for GTAW?

• A. Negative (DCEN)
• B. Positive (DCEP)
• C. Neutral
• D. Alternating

Answer: (A)

In GTAW, polarity controls how heat is distributed between the electrode and the workpiece. Using direct current with the electrode negative concentrates most of the heat in the workpiece, giving deeper penetration while keeping the tungsten electrode cooler and extending its life. This setup—DC with the electrode negative—is the standard choice for welding steels and stainless steels with a non-consumable tungsten electrode. If you used the electrode positive, more heat would go into the electrode, increasing tungsten wear and reducing penetration. Neutral polarity isn’t a distinct GTAW setting, and alternating current is typically used for aluminum to help oxide cleaning and balance heat. So the best choice for GTAW in most situations is negative (DCEN).