With its special property, the mental W. is suitable for the TIG welding and the other electrode materials alike. To enforce the welding power of W electrode by adding rare-earth oxide in the mental W., the property of W can be improved greatly , with better electrode arc ,more stability of arc column, and less burning loss of electrode . The usual rare-earth annexing agents include the following: cerium oxide, thorium oxide, lanthana , zirconia and yttrium oxide ect.