80kg/(mm)^2 級高張力鋼の被覆アーク溶接における変形と残留応力

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This paper deals with a basic reseach on the characteristics of welding distortion and residual stress of HT80 high strength steel. Single-Vee groove welds have been made in rectangular plates of the steel by covered arc welding, and a series of measurements have been made of the thermal cycles and mechanical strains at some points of the base metal during the welding and cooling as well as the various types of distortions and the macro- and micro-residual stresses in the welded plates. Some points of interest revealed are as follows : 1) The transient mechanical strains in both longitudinal and transverse directions, which are correlative to the welding stresses, can be explained well by the temperature distribution in the plate at every moment during the welding and cooling. 2) A part of fan-like elastic deformation of the base metal plate on each side of the weld line that occurs due to the thermal stress during the welding remains after the cooling in addition to the conventional contraction occurring in the weld zone, whence the transverse shrinkage distributes archwise along the weld line and the longitudinal shrinkage is larger in the outside of plate than in the weld zone. 3) The micro-initial stress of base metal distributes irregularly, and so do the macro- and micro-residual stresses in the welded plate except in and near the weld zone, though the longitudinal macro- and micro-residual stresses caused by the welding process alone have the normal pattern such as tension in the weld zone and compression in the other. 4) The longitudinal plastic contraction occurs in the weld zone of about 40mm width, where the temperature rises above about 300℃ in the welding, and its comparatively small magnitude results in much smaller tensile residual stress therein than the yield point of base metal.
社団法人溶接学会の論文
1974-11-05

80kg/(mm)^2 級高張力鋼の被覆アーク溶接における変形と残留応力

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