MIG堆焊温度场有限元求解及验证

Finite element solution of temperature field of MIG bead weld and its verification

建立MIG堆焊过程的温度场模型,通过移动双椭球热源模型进行计算,考虑温度对材料性能参数以及工件表面散热条件的影响,并运用自适应网格技术,对模型进行数值分析,得到MIG堆焊过程的瞬态温度场和工件背面特征点的热循环曲线.并进行MIG平板堆焊的实际焊接试验,利用热电偶采集对应特征点的试验数据并与模拟结果进行对比比较.结果表明:计算得到的特征点焊接热循环曲线与试验结果基本一致,所建立的MIG堆焊温度场模型是准确的,温度场有限元求解是可行的.

A temperature field model of MIG bead weld was set up and it was used for temperature computations by using the double ellipsoid heat sources.Taking account of the impact of temperature on the material properties and heat dissipation from its surface and using the adaptive grid technology,a numeric analysis of model was performed and the transient temperature field of the welding process as well as the thermal cycle curve for the characteristic points on the back of workpiece were got.Experiment of MIG bead weld was conducted and thermal cycle curves of the corresponding points were got by using thermoelectric couple and its results were compared to those of simulation computation.The results showed that calculated and experimental results were basically the same,and the model of MIG bead weld was accurate and the finite element solution was feasible.