What type of power supply is commonly used for FCAW?

The commonly used power supply for Flux-Cored Arc Welding (FCAW) is constant voltage. This type of power supply maintains a consistent voltage throughout the welding process, which is crucial for ensuring a stable arc and consistent weld quality. In FCAW, the welding wire acts as both the electrode and the filler material, and the nature of the process benefits from the characteristics of a constant voltage source.

In constant voltage systems, as the electrode melts and the arc length changes, the current will automatically adjust to maintain the set voltage. This feature is particularly advantageous in FCAW, as it accommodates variations in the distance between the contact tip and the workpiece during the welding operation.

This contrasts with other types of power supplies, such as constant current, which are typically used for processes like Shielded Metal Arc Welding (SMAW). In constant current systems, the current remains constant while the voltage is allowed to vary. This is less suitable for FCAW, where a stable arc length is fundamental to achieving sound welds. Hence, constant voltage is the preferred choice for FCAW applications.