What color is produced when 1.5% Lanthana is added to a welding electrode?

When 1.5% lanthana is added to a welding electrode, it produces a gold color. Lanthanum is a part of the rare earth elements, and its incorporation into tungsten electrodes enhances certain properties beneficial for gas tungsten arc welding (GTAW). The gold color results from the specific formulation and composition of the electrode due to the lanthanum oxide coating. This particular color is not just a visual characteristic; it also indicates that the electrode has been designed for specific performance traits, such as improved arc stability and increased longevity.

In the context of welding, different alloying elements can impart various colors to the electrodes, which helps welders identify the type of electrode being used at a glance. This color coding aids in selecting the correct electrode for various applications and materials, enhancing efficiency and effectiveness in the welding process.