基于散热条件变化的弧焊熔透成形过程的数值模拟

Numerical Simulation of Penetration Process Based on Heat Transfer Condition Variation of Workpiece in the Arc Welding

利用有限元热场数值模拟技术 ,对焊接过程中变截面与非变截面焊件的温度场进行了模拟计算 ,定量地得到了由于焊件变截面散热条件变化 ,导致熔池动态热输出及熔透变化的过程 ,通过两种焊件计算结果的对比分析 ,得出可通过焊件热影响区长度方向的温度梯度和宽度方向的温度梯度的变化来反映熔池热输出变化及热输出变化与熔透变化具有一定对应关系的结论 ,为进一步实现基于能量平衡的熔透控制建立了一定的理论基础。

The temperature field of workpieces on the change of section and the non change of section was simulated with the finite difference approach in the arc welding.The process of dynamic heat output of the molten pool and the penetration variation were quantitatively analyzed.Moreover, by contrasting the results of numerical simulation on two kinds of workpieces,some conclusions were induced that the variation of heat output of pool and the penetration had homologous relation with the temperature gradient of length direction and width direction of HAZ and thus the penetration control on the energy equilibrium was based on these statements.