What type of power supply is primarily used in the GMAW process?

The Gas Metal Arc Welding (GMAW) process primarily utilizes a Constant Voltage power supply. This type of power supply maintains a relatively stable voltage level throughout the welding operation, which is crucial for ensuring a consistent and stable arc.

In GMAW, the electrode is continuously fed into the weld pool while the welder maintains a specific arc length. A Constant Voltage system allows for greater ease of arc stability because as the arc length increases or decreases (due to the movement of the gun or the melting of the electrode), the current adjusts automatically to maintain that preset voltage level. This characteristic is essential for the GMAW process, which relies on this consistency for effective and efficient welding.

Constant Voltage systems are particularly advantageous in GMAW applications because they allow the operator more control over the arc while minimizing issues such as spatter and burn-through, which can occur with other types of power supplies. Thus, the use of a Constant Voltage power supply perfectly aligns with the requirements and dynamics of the GMAW process.