锤击消除焊接接头残余应力的数值模拟

The Numerical Simulation of the Peening Effect on Welding Residual Stress

建立锤击作用的有限元数学模型，利用该模型对白口铸铁焊补时锤击消除焊接残余应力进行实例分析。结果表明，在合适的焊接规范和工艺下，锤击不仅能有效地消除白口铸铁焊缝部位的应力，而且能促进热影响区拉伸残余应力的释放，甚至可以获得一定值的压应力。当在８４０℃～３６０℃温度区间进行锤击时，可以获得最佳效果。

According to the special feature of peening,a finite element model of peening was constructed.Taking the white cast iron weld-reparied for example,the welding residual stress effected by peening was analyzed.It is showed that peening is an effective method to relieve welding residual stress. Under the suitable welding parameters and technique,peening not only eliminated the stress in the bead ,but also improved the relief of the tensil residual stress ,even acquired a certain compress stress, in the heat effected zone(HAZ).Peening in the temperature range of 840℃￣360℃,the best results can be obtained.