Which tungsten preparation would be selected for welding with EWTh-2?

Which tungsten preparation would be selected for welding with EWTh-2?

• A. Conical
• B. Flat
• C. Balled
• D. Rounded

Answer: (A)

A pointed, conical tip is preferred for EWTh-2 in DC GTAW because a sharp point concentrates the current and arc at a small area. This focuses heat where you want it, gives a stable, easily controllable arc, and minimizes electrode wear under high DC current. The other shapes are more suited to different conditions: a balled tip is common for AC welding (to help arc stability with alternating polarity), while flat or rounded ends spread the current over a larger area and reduce arc control for high-current DC welding with thoriated tungsten.

A pointed, conical tip is preferred for EWTh-2 in DC GTAW because a sharp point concentrates the current and arc at a small area. This focuses heat where you want it, gives a stable, easily controllable arc, and minimizes electrode wear under high DC current. The other shapes are more suited to different conditions: a balled tip is common for AC welding (to help arc stability with alternating polarity), while flat or rounded ends spread the current over a larger area and reduce arc control for high-current DC welding with thoriated tungsten.