新制御圧延(TMCP)型50キロ級高張力鋼溶接継手部の疲労強度とその評価(その3)

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From among the welded joints produced in TMCP-manufactured 50kgf/mm^2-class high tensile steel plates, combinations of the fillet joint boxing the stiffener, etc. to plate surface and the plate-to-plate high-heat-input butt joint located at different proximities to each other were taken up for experimental study of their fatigue strength at the toe of fillet weld and the softened part of butt weld HAZ, respectively, which were overlapped in some instances. Through the experimental study, in which the stiffener boxing was performed first to be followed by plate-to-plate butt welding and vice versa, the following conclusions were obtained. (1) The fatigue strength at the toe of fillet weld boxing the stiffener to plate surface is not affected by the proximity between the toe of fillet weld and that of plate-to-plate butt weld. (2) The fatigue strength at the toe of the stiffener boxing fillet weld is likewise unaffected by the change in sequence of the two welding operations (the stiffener boxing followed by the plate-to-plate butt welding and vice versa). (3) Whether boxing the stiffener to plate surface with the toe of fillet weld overlapping the softened part of plate-to-plate high-heat-input butt weld HAZ or doing same to plain plate surface devoid of such a butt joint, the fatigue strength at the toe of fillet weld remains equal in both instances. Neither is the fatigue strength at the toe of stiffener boxing fillet weld appreciably affected by the softening of HAZ of adjoining plate-to-plate high-heat-input butt joint.
社団法人日本船舶海洋工学会の論文
1991-03-29

新制御圧延(TMCP)型50キロ級高張力鋼溶接継手部の疲労強度とその評価(その3)

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