NEW TECHNOLOGY IN RESISTANCE WELDING ELECTRODE MATERIALS
Welding , DS Copper , electrodes
A dispersion strengthened (DS) copper is described wherein the strengthening is achieved by a uniform distribution of angstrom size particles of AUO., throughout the copper matrix.Some properties relevant to the per-formance in resistance welding are given and compared with conven-tional precipitation-hardened copper alloys.A cold forging technique was devel-oped to obtain an isotropic equiaxed grain structure in DS copper. Elec-trodes made by this process were comparatively tested against RWMA Standard Class II electrodes in two different welding tests.Cold forged DS copper electrodes had less wear after 15,000 welds than did the Class II electrodes after 2500 welds. Mushrooming characteristics also showed a dramatic improvement over Class II electrodes. On galvanized steel, Class II electrodes exhibited a strong tendency toward sticking to the work and pitting of the welding face. DS copper electrodes did not stick to the work and did not show as much pitting.In short tests dome nose electrodes showed significantly less wear and mushrooming compared to pointed nose electrodes in case of DS copper.