NUMERICAL SIMULATION OF PENETRATION PROCESS BASED ON THE VARIATION OF HEAT TRANSFER CONDITION

In this paper, the process of dynamic heat output in a welding pool and the variation of the penetration caused by the section change of the workpiece are analyzed using numerical simulation technique of thermal field. It is concluded that the variation of temperature gradient in HAZ along the length and width direction reflects the heat output of the welding pool, and that the output of the welding pool has a homogenous relationship to the pool penetration.

基于散热条件变化的弧焊熔透成形过程的数值模拟

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。