热沉对焊接残余变形的影响及参数优化分析

Influence of heat sink on welding residual deformation and optimization analysis of parameters of heat sink

关键词:  动态低应力无变形焊接  热沉  数值仿真  优化分析  残余变形

Key words:  dynamically controlled low stress no-distortion(DC-LSND) welding  heat sink  numerical simulation  optimization analysis  residual deformation

摘要:

对常规的熔化极保护气体焊(MAG)和动态控制低应力无变形(dynamicallycontrolled low stress no-distortion,DC-LSND)MAG焊进行了数值仿真,并对实际的DC-LSND焊件进行了测量,数值仿真结果与试验结果吻合良好.以构架侧梁的焊接残余变形为研究对象,利用数值仿真模型并结合优化算法对热沉参数进行了优化分析,得到了相应的最优方案.结果表明,最优参数下DC-LSND MAG焊控制焊接残余变形的效果明显.

Abstract:

The numerical simulations have been done for both the conventional metal active-gas welding(MAG) and the dynamically controlled low stress no-distortion(DC-LSND) MAG welding,and the measurement has been done for the DCLSND experimental weldment as well,it is found that the simulating result is basically consistent with the measured data.Subsequently,the welding residual deformation of the partial side beam of bogie frame was selected as a research object,the optimization analysis of parameters of the heat sink had been done with the numerical simulation combining with optimization algorithm,and the alcording optimum scheme was obtained.The results showed that the control effect of welding residual deformation was obvious by the DC-LSND MAG welding with the optimum parameters.