What type of power source does FCAW typically use?

• A. Constant voltage (CV)
• B. Constant current (CC)
• C. Pulsed DC
• D. AC only

Answer: (A)

Flux-Cored Arc Welding relies on keeping the arc voltage essentially constant while the electrode is continuously fed. A constant-voltage power source is ideal because, as you feed more wire and adjust your travel, the arc length can vary. The CV supply holds the arc voltage steady, so the current naturally changes with the wire feed and position, producing a stable arc, consistent penetration, and a smooth bead. Using a constant-current source would fight against this stability, causing the arc and penetration to wander as the wire feed and arc length change. Pulsed DC may be used in some setups to control heat and spatter, but it’s not the standard configuration for FCAW. DC is also the typical polarity for FCAW rather than AC-only.