激光诱导焊接温度场的数值模拟

Numerical simulation of temperature field during laser-induced welding

提出了激光诱导的概念,建立了激光诱导物理及热源模型,推导了激光诱导移动点热源加热薄板的准稳定状态方程.利用MARC软件对304不锈钢激光诱导焊接温度场进行了有限元分析.选取建立的激光诱导热源模型,进行二次开发编写子程序,实现激光诱导移动点热源的加载.利用高温热电偶实测激光诱导焊接的温度场热循环曲线,将模拟值与实测值进行对比分析,结果表明,模拟值与实测值吻合良好.

The concept of laser-induced welding was developed and the physical and heat source model for laser-induced welding were established in this paper. The quasi-steady state equations for moving spot heat source during laser-induced welding were built. The finite element analyses were conducted through MARC software for the temperature field during laser-induced welding of 304 stainless steel. The loading of the moving spot heat source in laser-induced welding was realized based on the equations by using secondarily developed subroutine. Meanwhile,the simulated values were compared to the experimental results by measuring the thermal cycling curve of temperature filed in laser-induced welding with high temperature thermocouples. The results show that the simulated values agreed well with the measured ones.