Resistance welding electrode has core and shell made from two different copper alloys connected by a thin solid solution, typically a micron thick

The electrode consists of a core (2) of a dispersoid copper/aluminum alloy or an alloy of copper containing less than one percent of aluminum, boron, carbon and oxygen as additives, and a shell (3) of a copper-zinc or copper-zinc-zirconium alloy. The core can be positioned axially or eccentrically relative to the shell, which is basically cylindrical in shape with a truncated conical forward end (6) into which the core projects to form an active face (4). The manufacture of the electrode includes a bimetallic drawing stage carried out at a temperature of about 860 to 880 degrees C. The two alloys are connected by a thin solid solution, typically a micron thick. L'invention se rapporte à une électrode de soudage par résistance, caractérisée en ce qu'elle comprend un coeur (2) et une enveloppe (3) formés par deux alliages de cuivre différents, la liaison métallurgique entre le coeur (2) et l'enveloppe (3) étant assurée par une solution solide de faible épaisseur, typiquement de l'ordre du micromètre.