The Properties of Spot Welds in Anti-Corrosive High Tensile Steels
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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.<BR>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.<BR>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.<BR>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.<BR>Meanwhile, the crack initiating mechanism of spot welds in fatigue failure has been clarified.<BR>The experimental work has shown that a clean scale-free surface and high electrode force are essential for the uniform tempering of spot welds.
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