Abstract
As a part of investigation on the fatigue strength of multi-spot welded joints arranged in perpendicular to load direction, plane stress distributions of single- and multi-spot welded joints were studied. The purposes are to make clear effects of specimen width and/or lap length on stress distribution of single-spot welded joint and of spot space and/or lap length on that of multi-spot welded joint. Moreover, it was intended to find out a relationship between plane stress distributions of single- and multi-spot welded joints.First, qualitative studies of stress distribution on line (the X-axis in Fig. 1) including nugget front where fatigue crack may generate were carried out. Second, based on the above qualitative studies, quantitative studies of stress distribution by means of finite element method were carried out. Main conclusions obtained in this investigation are as follows:(1) Effects of specimen width and/or lap length on stress distribution of single-spot welded joint were made clear.(2) Effects of spot space and/or lap length on stress distribution of multi-spot welded joint were made clear.(3) Effects of specimen width on stress distribution of single-spot welded joint and of spot space of the same length on that of multi-spot welded joint are equivalent, as long as ratio of specimen width of single-spot welded joint or of spot space of multi-spot welded joint to nugget diameter is not extremely small.(4) If the stress distribution (σy on the X-axis) of single-spot welded joint with sufficiently large specimen width is known, it is possible to estimate. approximately stress distributions of single- and multi-spot welded joints with different specimen widths or spot spaces but with the same lap length.(5) Moreover, if an applied load that either maximum stress of single-spot welded joint with some specimen width and lap length or of multi-spot welded joint with some spot space and lap length becomes a specific stress value is known, it is possible to estimate, by using the graph shown in Fig.12 (This figure shows the relationships between specimen width or spot space and load ratios, using lap length as parameter), a similar load for single-spot welded joint with any specimen width and lap length or for multi-spot welded joint with any spot space and lap length.
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