Nebraska GTAW FFA TIG Welding Practice Exam

What color is tungsten when it is lanthanated?

Blue or gold Green or brown Red or purple White or gray

Correct Answer:

Blue or gold

Explanation:

Color coding on tungsten electrodes identifies the dopant in the tip, which affects arc behavior. Lanthanated tungsten is doped with lanthanum oxide, and many manufacturers mark it with blue or gold on the electrode tip. This distinguishes it from pure tungsten (often green) and from thoriated tungsten (typically red). So, blue or gold is the sign that you’re using lanthanated tungsten. The other color pairings correspond to different alloying or purity levels, not lanthanated.

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