焊接顺序和焊接结构对振捣座残余应力的影响

Influence of welding sequence and welding structure on residual stress of vibration seat

焊接残余应力大小影响整机的性能和使用寿命,研究振捣座的残余应力分布有着重要的工程意义。利用焊接数值模拟手段,对整机振捣座的不同焊接结构和多种焊接顺序进行优化分析,获得振捣座的焊接残余应力分布状况,结合实验手段,验证有限元模型的正确性和有效性。结果表明,采用对称施焊得到的残余拉应力的峰值最小。改变焊接结构形式,加强板在关注位置内侧残余应力分布趋势稳定,而在外侧趋势变化较大,且峰值增大。该研究为优化生产工艺,为后续控制焊接残余应力提供理论依据。

Welding residual stress affects the performance and service life of machine, studying the residual stress distribution of vibration seat has important engineering significance. By welding numerical simulation method,the different welding structures and various welding sequences of vibration seat are optimized and analyzed to obtain the welding residual stress distribution of vibration seat, and the correctness and validity of the finite element model are validated combining with the experimental method. The results show that the minimum peak of residual tensile stress is got by symmetry welding. Changing the welding structure ,the residual stress distribution trend of reinforcing plate on the inside of concern location is stable ,but the trend changes greatly in the outside of concern location and the peak increases. This research provides theoretical basis for optimization of production technology and subsequent control of welding residual stress.