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概要

In this study, the effects of seal welding conditions, such as welding heat input, depth of crack, and plate thickness, on the welding-induced residual stress and the stress intensity factor (SIF) around the remaining crack were investigated by finite element analysis. In addition, the parameter Q/√a (Q: welding heat input, a: depth of crack) was theoretically derived from welding thermal conduction theory as representative of the temperature distribution along the crack direction. As the results, it was clarified that the residual stress at the downside crack tip is governed largely by the parameter Q/√a. Similarly, the SIF depends on the parameter Q/√a. When the range of Q/√a is smaller than approximately 1.5, the residual stress at the downside crack tip becomes compressive and the SIF becomes 0. An appropriate seal welding condition corresponding to crack size helps to ensure higher structural soundness and reliability of seal welds.

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