Bonding Characteristics of Various Metals by DC Pulse Resistance Heat Pressure Welding

Abstract

The characteristics of various metals bonded by DC pulse resistance heat pressure welding using spark plasma sintering (SPS) process are investigated. As the results of the experiments, the SPS process is found to complete heat pressure welding in a much shorter processing time than the conventional hot pressing process because the SPS process supplies the electric resistance energy directly to the specimens. In addition, the following conclusions are obtained: (1) Bonding strengths of 130∼200 MPa between Al-11.5 mass%Si alloy and Al-20.0 mass%Si alloy including SiC particles can be obtained with the application of titanium powder at the interface. (2) For the combinations of similar metal, complete bonding, that is, a bonding ratio of approximately 100%, can be obtained. However, sufficient bonding strength cannot be obtained for the combination of cemented carbide. (3) Dissimilar steels can be bonded with a bonding ratio of more than 70%. (4) A bonding strength is reduced for the combinations of titanium alloy and other metals, because of the formation of some intermetallic compounds at the interface.