Effect of Residual Hydrogen on Durability of Tungsten Electrodes

Abstract

Spot welding is an important process in industry. High conductive materials such as copper and aluminum need huge current and high pressure in the welding, therefore tungsten and molybdenum materials are used for the electrode. In this study, hydrogen desorption of a unrecrystallized-tungsten, a recrystallized-tungsten, a copper-tungsten and a cerium-tungsten electrodes were measured by the thermal desorption spectroscopy. The welding operations were repeatedly carried out up to 3,000 cycles. As the result, an effect of residual hydrogen on the durability of tungsten electrode was not confirmed.