Improvement of Fatigue Strength of Fillet Welded Joint for 80 kg/mm^2 High Strength Steel

概要

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A new electrode called LBF62 was developed to improve the toe geometry of fillet welded joint for 80 kg/mm^2 high strentgh steel. Fatigue tests were conducted on specimens with fillet welded joint made by a new type of electrode, LBF62, and the conventional type, LB62F, to investigate the effect of improvement of toe geometry on fatigue strenght. Fatigue limits of the specimen with fillet welded joint made by the new electrode were 13.0 and 21.1 kg/mm^2 for the stress ratio of 0.6 and -1, respectively. On the other hand, fatigue limits of the specimen made by the conventional type of electrode were 10.7 and 15.4 kg/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 for improving the fatigue strength of fillet welded joint for 80 kg/mm^2 high strength steel. In addition, the fatigue limits of specimens were estimated by applying the test results mentioned in the previous reports, in which the effect of toe geometry of fatigue strength was discussed, and estimated fatigue limits were in good agreement with the experimental values.
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