What type of welding machine is used for GMAW?

In Gas Metal Arc Welding (GMAW), also known as MIG welding, a constant voltage welding machine is essential. This type of machine maintains a steady voltage level throughout the welding process, which is crucial for ensuring a stable arc length and consistent arc characteristics. The process relies on the feeding of filler material through the welding gun at a constant speed while the electrical voltage remains steady, allowing for smooth metal transfer from the electrode to the workpiece.

Constant voltage operation in GMAW contributes to the process's versatility, enabling the welder to adjust the welding speed or travel speed without adversely affecting the arc stability. As the arc length changes with the movement of the welding gun, the welding machine automatically compensates, providing a consistent performance crucial for achieving high-quality welds. This makes constant voltage the most efficient and effective choice for GMAW compared to other options.