Abstract
In this paper, the influence of spot welding location on fatigue strength of two spot welded joints under tensile shear was investigated. The nominal structural stresses σ_<ns> which is a fatigue life evaluation parameter of spot welded structure were calculated and the fatigue test of two spot welded specimen were conducted. The main results were as follows. The nominal structural stress of parallel two spot welded joints is smaller than one of joints with two spot welds arranged in series. The information obtained was verified by the experimental results of fatigue test. The rate of fatigue life was calculated using the nominal structural stress showed a better trend compared with fatigue test result. Fatigue life of series two spot welded joints is not greatly affected by variation of spot welding location. However, fatigue life of parallel two spot welded joints received up to 35% at the maximum the effect of variation of spot welding location.
