Fatigue Properties of Steel-aluminum Alloy Joint Fabricated by Dissimilar Joining Method DSW

Abstract

Tensile shear tests and fatigue tests were performed for dissimilar joints of steels and aluminum alloys fabricated by Dimple Spot Welding (DSW), which is a novel method for dissimilar metal joining. In the tensile shear tests, two failure modes of DSW joints were observed, and the tensile shear strength was affected by the strength of base metals. In fatigue tests, failure mode was fretting fatigue, and the fatigue life was not simply determined by the strength of base metals. The both tensile shear strength and fatigue strength were higher in the DSW joint compared with the Self-Pierce Riveting joint.