溶接低温割れへの力学的パラメータ F_I の適用に関する実験的検討

概要

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Stress field parameter F_I. which controls the stress level in the vicinity of the root of first-pass weld and the notch of the Implant specimen has been proposed by the authors as a controlling parameter for weld hydrogen cracking. The previous papers reveal that the correlation between Implant test results and RRC/TRC test results of 80kg/(mm)^2 high strength steel (HT80) can be explained with fair accuracy by using the stress field parameter F_I. In the present paper, adresses applicability of the stress field parameter F_I to cover not only HT80 steel but also 50kg/(mm)^2 high strength steer (HT50). Moreover, it proposes the applicability of the parameter F_I for the another H type crack test. The F_I parameter newly proposed in the present paper proved applicable for considering the correlation between the deep notch Implant test and the RRC/TRC test for not only HT80 steel but also HT50 steel under the same conditions in the testing of both the remaining hydrogen content H_<R100> and the HAZ microstructure. The F_I-parameter is affected by the various geometrical factors of the root weld. The F_I-value calculated by using the average geometrical parameter can be applied to consider the correlation anong the various cracking tests.
社団法人溶接学会の論文
1982-02-05