Gas tungsten and plasma arc welding electrode having a carbide emitter end

摘要

An improved welding electrode with a high current capacity that is non- consumable for use in gas tungsten arc welding and in plasma arc welding in which the electron emission capability of the electrode is increased and enhanced by the material composition of the electrode, and in particular of the emitter end. The emitter end consists of the use of tungsten carbide as a base metal for the activating elements thorium or zirconium. The invention also considers the use of refractory carbides such as tantalum carbide, zirconium carbide or molybdenum carbide in the emitter end. Also configurations are disclosed which permit the use of high electron emissions material with the shank portion of the electrode consisting of materials of high electrical and thermal conducting properties such as copper, molybdenum, or tungsten. The electrode provides for superior welding current for improving GTA or PA arc welding resulting in superior welding capability and controllability for welding processes.