In-process Control of Distribution of Weld Residual Stress and Improvement of Structural Soundness

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In-process control welding with a trailing heat-sink for reducing welding-induced residual stress was developed. The effect of cooling conditions on the reduction of residual stress was investigated by numerical simulation. After that, the reduction of residual stress was verified quantitatively by measurement experiment. Furthermore, appropriate seal welding conditions for controlling weld residual stress at the remaining crack tip regionwas theoretically and analytically derived. In addition, using the fracture mechanics parameter, the usefulness of control of weld residual stress distribution for improving the structural soundness at repair weld was clarified.