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The pulse electric current bonding (PECB) process, also called plasmaactivated sintering (PAS) or spark plasma sintering (SPS) by some researchers, has received much attention as one of the most advanced materials bonding processing in recent years. To clarify the characteristics (bonded area, strength, inclusion ratio, electrical resistance and so forth) in the PECB process, the effects of surface roughness were investigated using SUS304 stainless steel with no interlayer materials. The following results were obtained. When the surface was smooth, tensile strength of the joint was high and deformation of the joint was small. But focusing on the bonded area, when the surface was rough, the contact area was heated locally, and the temperature was higher than the average temperature of the joints. As a result, the amount of inclusion was small in the bonded area, and the bond quality was better.

Effect of Surface Roughness on the Joints of Bonded SUS304 Stainless Steel using a Pulse Electric Current Bonding Process