What color band identifies 2% thoriated tungsten?

The color band that identifies 2% thoriated tungsten is the red band. In tungsten electrodes used for gas tungsten arc welding (GTAW), different color bands indicate the percentage of the alloying elements present in the tungsten. Specifically, the red band signifies that the tungsten contains 2% thorium, which is beneficial for improving arc stability and providing a higher melting point compared to pure tungsten.

This characteristic is important for weld quality and performance, as thorium enhances electron emission, making it easier to start and maintain the arc. The presence of the red band on the electrode serves as an immediate visual cue for welders to select the appropriate tungsten for their specific welding application. Understanding these color coding conventions is essential for ensuring that the right electrode is used, which can lead to better weld quality and efficiency.