A constant current power supply is needed for?

A constant current power supply is needed for?

• A. GTAW
• B. GMAW
• C. FCAW
• D. SAW

Answer: (A)

GTAW relies on precise control of heat input, and the current directly governs the amount of heat in the weld area. The tungsten electrode is non-consumable, so keeping the welding current steady despite small changes in arc length or voltage helps maintain a stable arc and consistent penetration. A constant current power supply provides that steady amperage, making it ideal for TIG welding. In contrast, the other processes typically use a constant voltage setup because their arc behavior is more effectively stabilized by maintaining a relatively constant arc voltage as the wire feed and other factors vary.

GTAW relies on precise control of heat input, and the current directly governs the amount of heat in the weld area. The tungsten electrode is non-consumable, so keeping the welding current steady despite small changes in arc length or voltage helps maintain a stable arc and consistent penetration. A constant current power supply provides that steady amperage, making it ideal for TIG welding. In contrast, the other processes typically use a constant voltage setup because their arc behavior is more effectively stabilized by maintaining a relatively constant arc voltage as the wire feed and other factors vary.