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

为了减少焊接产生的残余应力，开发了带拖尾散热器的过程控制焊接。通过数值模拟研究了冷却条件对残余应力降低的影响。然后，通过测量实验定量验证了残余应力的降低效果。在此基础上，从理论和分析两方面推导了控制残余裂纹尖端区域焊缝残余应力的合适密封焊接条件。此外，利用断裂力学参数，阐明了控制焊缝残余应力分布对提高补焊缝结构稳健性的作用。

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.