Tungsten electrodes are used in arc welding with inert gas and tungsten (TIG). Tungsten is used at very high temperatures as it resists melting and degrades very little (if working in a controlled atmosphere with inert gases as is usually the case).
The type WC-20 Gray consists of 98% tungsten and 2% cerium oxide and is completely radiation-free. WC-20 is a standard electrode for all DC applications. The welding current during AC welding should not exceed about 100 A
The electrodes are made by sintering powders and subsequent forging.