| 摘要 |
<p>A bimetal resistance welding electrode has a dispersion strengthened copper tip (15) and a high conductivity copper shank (17). It is made by forming a tip member in two successive upsetting operations to produce a tip member having a coating of high conductivity copper (67 in the finally extruded electrode) covering substantially all of one end thereof. A solid, high conductivity copper, cylindrical billet is formed and brazed (at 19) to the tip member at its coated end to form an extrusion blank. The extrusion blank is back-extruded with the high conductivity copper material being worked substantially, while only partially back extruding the tip portion of the extrusion blank.</p> |
