COATED STAINLESS-STEEL/COPPER WELD FOR ELECTROPLATING CATHODE

摘要

A copper welding rod is used in an arc-welding operationto form a bead that joins a copper starter sheet and a stainlesssteel hanger bar. The amperage level of the arc-weldingequipment is set to generate heat at the weld site which is abovethe melting point of copper and below the melting point ofstainless steel. This results in a welded joint between thecopper bead and the hanger bar and a brazed joint between thecopper bead and the starter sheet. Since brazing produces littleor no fusion, the area of contact between the two dissimilarmetals is limited to the interface between them, whichsignificantly reduces the damaging effects of galvanic corrosion.Another improvement lies in the application of a corrosion-resistant metallic coating on the joint between the hanger barand the starter sheet using a high velocity oxygen fuel flamespray technique.