Abstract: Tensile shear test of spot welds and weld-bonded joints of 1.5 mm SUS304 austenitic stainless steel was made to acquire their tensile strength. Fatigue test of spot welds and weld-bonded joints was carried out under different levels of stresses, and two kinds of joint′s load-life curves were obtained. Scanning electron microscopy was used to explore the fatigue failure mechanism. Results showed that the relatively good parameters for weld-bonded joints were welding current 10.0 kA, welding time 80 ms, and welding pressure 0.5 MPa. Under this welding parameters, the tensile strength of spot welds, uncured weld-bonded and cured weld-bonded joints were 12 825.5 N, 10 345.6 N and 10 022.9 N, respectively. Weld-bonded joints had a higher fatigue strength than spot welds. Fatigue failure modes of spot welds and weld-bonded joints were mainly composed of eyebrow failure and interfacial fracture mode. In the process of fatigue failure of weld-bonded joints, the rubber failure occurred first, then fatigue crack initiated from the heat affected zone edge between the inner surface and extended in the direction of thickness and width.
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2017, Vol. 31 
