激光冲击电火花堆焊焊缝表面的有限元模拟

Finite Element Simulation of Laser Shock Processing on the Welding Line Restored by Electro-Spark Overlaying

为了探究激光冲击强化对电火花堆焊表面应力状况的影响,采用有限元分析软件ANSYS模拟电火花堆焊焊接过程,计算得出了焊接残余应力场的分布。在此基础上,利用ANSYS/LS-DYNA软件、进行了激光冲击堆焊焊缝表面的有限元模拟。结果显示:焊缝区域、热影响区域和基体残余应力经激光冲击处理都有明显的改善,焊缝区残余拉应力有效减少或消除。模拟结果与实验结果相吻合,这为有限元软件对焊接修复及激光处理工艺参数的优化提供了可靠的依据。

In order to explore the effect on residual stress of welding line by laser shock processing, finite element analysis software ANSYS was used to simulate the welding process and to calculate the distribution of welding residual stress field. On this basis, then AYSYS/LS-DYNA was used to simulate the laser shock processing on welding line. Results show that residual stress distributions of weld region, heat-affected region and matrix by laser shock processing are clearly improved, and the tensile stress of weld region effectively reduce or eliminate. The simulation results and experimental results are generally consistent, which offers reasons for parameter optimization of welding and laser shock processing by finite element analysis software.