Abstract: There is described an improved process for the production of tri-metallic contact rivets, in the course of which a cylindrical slug is formed with increased diameter under constant plastic deformation (upsetting) from three wire segments, and on this slug a head is then formed on one end by transformation.

Abstract: A process for the production of bi-metallic contact rivets with especially thin precious metal layers.

Abstract: A laminar contact material having one layer of silver or a non-oxidizable silver alloy and another layer of silver intimately mixed with an oxide of cadmium and/or other oxidizable metal is made by cladding the non-oxidizable layer with a silver alloy of the oxidizable metal in the "as cast" condition by continuous hot rolling, and thereafter exposing the compound material at elevated temperature to an atmosphere rich in oxygen.

Abstract: A double-contact rivet is formed from wire portions cut from wire supplies. The wire portions are aligned so that outer portions of electric contact material are located on either side of a central portion of support material, and the two outer portions are cold-welded to the central portion. One end of the body so formed is punched to provide a contact head while the bead formed by the cold-welding at the other end is pressed to a substantially flat ring form and hardened by rapid cooling. The hardened ring bead is cleanly cut from the remainder of the rivet.

Abstract: A process for making a solderable composite body containing silver cadmium oxide comprising forming an assembly having an intermediate layer of a silver copper alloy located between a layer of a silver cadmium alloy and a layer of silver of silver alloy, welding the layers together, and subsequently oxidizing the cadmium.