Which color indicates that 2% Lanthana has been added to a welding electrode?

The correct identification of the color indicating that 2% Lanthana has been added to a welding electrode is blue. In the context of welding electrodes, the addition of various oxides, including Lanthanum Oxide (Lanthana), is used to enhance the performance of the electrode. The coloring system is a standardized method to quickly identify the composition of the tungsten electrodes.

For example, blue signifies the presence of 2% Lanthana, which is known for providing excellent arc stability and a longer lifespan for the electrode. This makes it particularly suitable for welding applications requiring high precision. The quick references to these colors help welders and technicians ensure they are using the correct electrode for the specific welding task at hand, optimizing both safety and effectiveness in welding processes.