すみ肉溶接継手の止端の研削及びワイヤピーニングによる疲れ強さ向上(第 1 報)

概要

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Various mechanical methods of improving the fatigue strength were investigated by using the base metal and cruciform fillet welded joint specimens fabricated from 40kg/(mm)^2-80kg/(mm)^2 steels, and the results were summarized as follows. The fatigue strength of cruciform fillet welded joints fabricated from various steels were almost the same, and their 2×(10)^6 cycles pulsating tension fatigue strength were 11.3-12.4kg/(mm)^2. In comparison of the 2×(10)^6 cycles pulsating tension fatigue strength of 80kg/(mm)^2 steel cruciform fillet welded joints, the toe ground one was 1.5 times, the peened one was 2.06 times, and the toe ground and peened one was 2.58 times (both effects of grinding and peening were found to be nearly added) as many as as welded one. The effect of improving the fatigue strength is considered to originate chiefly from the compressive residual stress induced by peening. These methods of improving the fatigue strength were more effective in alternating tension and compression than in pulsating tension. Also, in 40kg/(mm)^2 steel cruciform fillet welded joint, the peening treatment was effective to some extent.
社団法人溶接学会の論文
1980-02-05