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A welder might choose to use constant voltage as a power source primarily because it helps to minimize spatter and improve arc stability. In welding processes like MIG (Metal Inert Gas) welding, constant voltage systems provide a steady voltage throughout the welding arc, which leads to a more stable arc. This stability is crucial for maintaining a consistent arc length and penetration, which directly impacts the quality of the weld.

When the welding arc is stable, the chances of erratic arc behavior that could lead to increased spatter are significantly reduced. This is particularly advantageous in productions where quality and cleanliness of the weld are important. Additionally, stable arcs mean that the welder can focus more on manipulation of the torch or gun rather than on maintaining the arc itself, thus contributing to a smoother and more efficient welding process.

While other factors such as speed and aesthetics are important in various applications, the primary appeal of constant voltage lies in its ability to create a controlled and consistent arc, leading to cleaner welds with less spatter.