Which end is used for AC and DCEP?

• A. Pointed end
• B. Balled end
• C. Flat end
• D. Curved end

Answer: (B)

In TIG welding, electrode tip shape is chosen to suit the polarity. For AC and DCEP (electrode positive), a balled end is used because the rounded tip spreads heat over a larger area and resists rapid erosion from the alternating current and positive polarity. This helps keep the arc stable and reduces tip wear, making starts and maintaining the arc easier under these conditions. A pointed end concentrates heat and is typically used for other polarities, while flat or curved ends aren’t standard for AC or DCEP.