What is the color classification for Thoriated Tungsten?

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

Answer: (C)

Color coding on tungsten electrodes identifies the alloying elements added to improve performance. Thoriated tungsten is identified by the red color because thorium oxide is added to boost electron emission and allow higher current with a stable arc, making it especially suitable for DC welding. That’s why red is the correct classification for thoriated tungsten. Other colors correspond to different tungsten types, which are used for different welding needs. For safety, remember thorium is radioactive, so many shops now prefer non-radioactive alternatives when possible.