Patent ID: 6146488
Filing Date: 2000-11-14
Classification: B23K,C08L,C09J

Abstract:
A weld bonding method for bonding metal surfaces together with adhesion both by an adhesive and by resistance spot welding through the adhesive, comprising the steps of:preparing the adhesive by admixing a thermosetting epoxy resin, a latent curing agent and 1 to 15 vol % of one or more conductive additives selected from the group consisting of metal, metal oxide, metal carbide, metal nitride, metal boride and metal silicide, said additive being in the form of a powder having a particle size of 10 .mu.m or less, or in the form of fragments or flakes having a thickness of at least 0.5 .mu.m and a particle size of 30 .mu.m or less;applying the adhesive to at least one of the metal surfaces to be bonded;then spreading the applied adhesive;then placing the metal surfaces together with the spread adhesive therebetween;then spot welding the metal surfaces together; and then heating the metal surfaces to cure the adhesive whereby the additive improves conductivity to enhance the strength of the spot welds.