高張力鋼すみ肉溶接継手の疲れ強さの改善

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A new electrode called LBF62 was developed for improvement of toe geometry of fillet welded joint in 80kg/(mm)^2 high strength steel. Fatigue tests were conducted on specimens with fillet welded joint made by a new type of electrode, LBF62,and by the present type, LB62F, and the effect of improvement of toe geometry on fatigue strength was investigated. Ina ddition, the fatigue limits of specimens were estimated by using the test results in the previous reports, in which the effect of toe geometry on fatigue strength was discussed. The following conclusions were obtained : (1) Mean values of toe radius and flank angle measured in the specimen with fillet welded joint made by the new type of electrode were 4.4mm and 32°, respectively. The value of toe radius was 4 times that measured in the specimen made by the present type of electrode and the value of flank angle was 20°smaller than that measured in the specimen made by the present type of electrode. (2) Fatigue limits of the specimen with fillet welded joint made by the new electrode were 13.0 and 21.1kg/(mm)^2 for the stress ratio of 0.6 and -1,respectively. On the other hand, fatigue limits of the specimen made by the present type of electrode were 10.7 and 15.4kg/(mm)^2 for the stress ratio of 0.6 and -1,respectively. Accordingly, the improvement of toe geometry by using the new type of electrode was very effective on the fatigue strength of fillet welded joint in high strength steel. (3) Grinding of toe surface affected the fatigue limit scarcely but nearly doubled the crack initiation life in the specimen made by the new electrode. (4) Estimated fatigue limits were in good agreement with the experimental values.
1975-02-05

高張力鋼すみ肉溶接継手の疲れ強さの改善

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