PRODUCTION OF COMPOSITE ELECTRODE TIP FOR RESISTANCE WELDING

摘要

PURPOSE:To obtain an electrode tip having a long life at a low cost with good workability by packing dispersion strengthened copper alloy and pure copper or copper alloy powder in the form of lamination into a metallic mold, subjecting the powders to compression molding and molding the same to the electrode by cold working after hot forging. CONSTITUTION:The dispersion strengthened copper alloy powder and the pure copper powder are packed into the metallic mold for powder molding and are molded under the prescribed pressure to obtain a preform A1 for the compression-molded electrode tip consisting of the two layers of the dispersion strengthened copper ally part 1 and the pure copper part 2. This preform A1 is heated and is then subjected to the hot forging under pressurization by using a forging die and a punch having a spherical part in the front end part in such a manner that the spherical part side consists of the dispersion strengthened copper alloy part 1 to obtain a forging A2. This forging A2 is subjected to cold forging to form a water cooled end part in the pure copper part 2, by which the electrode tip A is obtd. The composite electrode tip for resistance welding having a long life is thereby obtd. with the good workability.