応力除去焼なましわれ防止方法の検討 : HT80 鋼の応力除去焼なましに関する研究(第 2 報)

概要

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The mechanism as to why stress-relief craking originates has been investigated from the standpoint of the residual stress. The results were obtained as follows : (1) The stress-relief cracking which occurs at the toes of the back side is closely related with the residual stress perpendicular to the weld line. Cracks arise when the residual stress exceeds 50kg/(mm)^2,whereas they do not appear at all under less than 50kg/(mm)^2. (2) In order to prevent the stress-relief cracking, it is advisable to select groove shapes and depositing methods with less than 50kg/(mm)^2 of the residual stress. (3) Whether or not the stress-relief cracking is caused is decided by the relation between the fracture stress of welded joints at the elevated temperature and the residual stress to the weld line after the stress-relieving.
社団法人溶接学会の論文
1977-12-05