Pure Tungsten Electrode: Suitable for welding under alternating current. Yttrium-Tungsten Electrode: Mainly applied in military and aviation industry with narrow arc beam, high compressing strength, highest welding penetration at medium and high current. Composite Electrodes: Their performance can be much improved by adding two or more rare earth oxides which are mutually complementary. The Composite Tungsten Electrode developed by us has been listed in State Developing Plan for new products.