The red color code on a tungsten electrode indicates which composition?

The red color code on a tungsten electrode indicates which composition?

• A. 2% Thoriated
• B. 2% Lanthanated
• C. Percentage tungsten coating
• D. Pure tungsten

Answer: (A)

Color coding on tungsten electrodes communicates their composition. The red-coded tungsten is a 2% thoriated electrode, meaning it’s doped with about 2% thorium oxide. That thorium boosts electron emission from the tip, which makes arc starting easier and helps keep a stable arc, especially for DC welding on steel and stainless. Keep in mind thorium is mildly radioactive, so use proper ventilation and handling precautions; many welders today opt for non-radioactive alternatives like lanthanated or ceria-based electrodes.

Color coding on tungsten electrodes communicates their composition. The red-coded tungsten is a 2% thoriated electrode, meaning it’s doped with about 2% thorium oxide. That thorium boosts electron emission from the tip, which makes arc starting easier and helps keep a stable arc, especially for DC welding on steel and stainless. Keep in mind thorium is mildly radioactive, so use proper ventilation and handling precautions; many welders today opt for non-radioactive alternatives like lanthanated or ceria-based electrodes.