Patent ID: 9108267
Filing Date: 2015-08-18
Classification: B23K

Abstract:
1. A pulse electric-current bonding method for bonding first and second metal materials whose bonding surfaces have a directional component parallel to a pressure-application direction, comprising: fabricating a pressure surface of the first metal material having a first shape for receiving a pressure therethrough, to have a directional component parallel to the pressure-application direction and a directional component perpendicular to the pressure-application direction; fabricating a pair of cores which have an electrical conductivity less than an electrical conductivity of the first and second metal materials, wherein at least one of the cores has a first surface along the pressure surface and a second surface perpendicular to the pressure-application direction; assembling the first metal material, the second metal material and the pair of cores, together with an electrically-conductive elastic member having a contact surface perpendicular to the pressure-application direction, wherein the electrically-conductive elastic member is placed between the pair of cores to allow the contact surface to come into contact with the second surface to provide a space for displacement of the at least one of the cores within the first shape of the first material and to transmit a pressure to the pressure surface of the first material in a direction perpendicular to the pressure-application direction; fixing the second metal material in a direction perpendicular to the pressure-application direction; preparing a pulse electric-current bonding unit which comprises: applying the pulse voltage between the paired electrodes by the voltage source, while applying the pressure to at least one of the paired electrodes by the pressure-applying device, to bond the first metal material and the second metal material together.