新しい割れ指数 P_H によるルート割れの解析

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Based upon the idea that hydrogen cold cracking in a steel weld occurs only when the local hydrogen concentration at the instant of crack initiation exceeds a critical value which depends on HAZ ductility and local stress, a new cracking parameter P_H was proposed in the author's previous report to predict the critical preheating temperature to avoid root cracking in the slit-type oblique-Y (Tekken) cracking test. In the present paper, an improved and generalized formula of cracking parameter is proposed with which the values of critical preheating temperature and critical restraint stress can be predicted for root cracking in any groove shape and eccentrically located weld. The predicted values are shown to agree satisfactorily with experimental ones. Since the new parameter is based on the stress concentration ratio and the accumulated local hydrogen at the highly stressed zone close to the root of a weld, the proposed prediction procedure seems to be effective also in most of the cold cracking problems in steel welding and will be described in the following reports. Moreover, a new formula is proposed to predict the critical restraint stress for root cracking in the oblique-Y groove Tekken test. It differs considerably from other formulae already proposed by other researchers on Implant test data. This may suggest that the Implant test data are not necessarily satisfactory for prediction of welding conditions in actual welding fabrication.
社団法人溶接学会の論文
1980-11-05

新しい割れ指数 P_H によるルート割れの解析

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