Abstract
In this paper, the influence of variation of nugget diameter and spot welding location on fatigue life of the spot-welded joints was investigated. The relationship between nominal structural stress, which is used as fatigue life estimation parameter, and influence factors of fatigue life on single spot-welded joints under eccentric tensile shear and triple spot-welded joints under peel load was quantitatively clarified, and fatigue tests of these specimens were conducted. Following the increase of the distance of eccentricity of spot welding location from the center line of tensile shear specimen, the influence factors of fatigue life became highly sensitive. The sensitivity of peel specimen was larger than one of tensile shear specimen.
