ELECTRODE TIP FOR SPOT WELDING

摘要

PURPOSE:To provide a titled electrode tip which extends the electrode life during spot welding of a galvanized steel sheet in particular by incorporating titanium oxide into a copper-base electrode thereby suppressing positively softening of the tip and the decrease in current density and making the surface alloy layer uniform. CONSTITUTION:Fine particles of titanium oxide TiO2 are dispersed and incorporated into a copper-based electrode. The hardness of the tip is increased and the softening thereof is prevented by TiO2 and the decrease in current density is suppressed by the fine distribution. The surface alloy layer formed with the material to be welded is made uniform and the local wear of the electrode is prevented as far as possible. The electrode life is thus extended even in spot welding of particularly a galvanized steel sheet with which the local consumption of the electrode is significant, by which the dot quality is improved and the interval for replacement is considerably prolonged.