What tungsten is identified by the grey color band?

The gray color band on tungsten electrodes signifies that it is ceriated tungsten. Ceriated tungsten contains a small amount of cerium oxide, which enhances the electrode's performance, particularly with DC welding applications. This type of tungsten is often favored in situations where low amperage or difficult-to-weld metals are involved, due to its ability to start arcs more easily and provide a stable arc.

Ceriated tungsten is also widely used for welding thin materials or for applications that require precise control of the welding arc. The presence of cerium in the alloy improves the overall performance during welding by contributing to better arc stability and longevity of the electrode.