耐候性鋼の点溶接部の性質について

概要

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This paper, following the previous report that dealt with the method of selecting the heat-treatment conditions of spot welds in anti-corrosive high tensile steels, gives details of the weldability assessment of these steels. The ductility ratio of these steels is about 50% as welded. But it can be improved by tempering to about 70%. Under combinations of these steels and low carbon steels, it can be improved to about 80% by tempering. The objective of this study was to check the reliability of the welded joint of these steels in SHIN KANSEN electric railcars structures. Therefore, a strict test had to be carried out on the joint. A new machine has been developed to test the fatigue strength of spot welds in these steels. The testing data show that the efiect of heat-treatment on the improvement of ductility of spot welds and the relationships between the fatigue strength of spot welds and the welding conditions can be easily analyzed. Meanwhile, the crack initiating mechanism of spot welds in fatigue failure has been clarified. The experimental work has shown that a clean scale-free surface and high electrode force are essential for the uniform tempering of spot welds.
社団法人溶接学会の論文
1971-01-25