Abstract
In this paper, the amount of variation in the fatigue life due to variations in the spot welding location and the nugget diameter of three spot-welded joints subjected to bending loading was determined quantitatively by sensitivity analysis. As a result, the effect on fatigue life due to variations in spot welding location was found to approximately the same as that of the nugget diameter. Further, the amount of change in fatigue strength due to the thickness for the tensile shear joints with nugget diameter5√t include components due to changes in nugget diameter. Both components have been separated by a sensitivity analysis. The ratio of the sheet thickness component and the nugget diameter component was 7:3. These analytical results were confirmed by the fatigue test.
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