Which color code represents pure tungsten for GTAW electrodes?

Which color code represents pure tungsten for GTAW electrodes?

• A. Green
• B. Yellow
• C. Red
• D. Brown

Answer: (A)

Color coding on GTAW tungsten electrodes shows what the electrode is made of. Green designates pure tungsten with no alloying elements. That purity means the arc behaves in a straightforward way and the electrode doesn’t contribute alloying elements to the weld, which is exactly what you want when you need a clean, uncontaminated arc. The other colors correspond to alloyed tungsten (such as thorium- or cerium/lanthanum-containing varieties) that are used to tailor arc characteristics for specific applications, but they are not pure tungsten. So green is the indicator for pure tungsten.

Color coding on GTAW tungsten electrodes shows what the electrode is made of. Green designates pure tungsten with no alloying elements. That purity means the arc behaves in a straightforward way and the electrode doesn’t contribute alloying elements to the weld, which is exactly what you want when you need a clean, uncontaminated arc. The other colors correspond to alloyed tungsten (such as thorium- or cerium/lanthanum-containing varieties) that are used to tailor arc characteristics for specific applications, but they are not pure tungsten. So green is the indicator for pure tungsten.