未熔透熔池液面三维形态的数值模拟

Numerical Simulation of 3D Liquid Surface Shape for Partial Penetrated Weld Pool

对脉冲TIG焊未熔透型熔池在脉冲峰 -基转换期间熔池三维形态变化行为进行了定性的分析 ,并从力和能量角度建立了未熔透熔池液面形态的数学模型。采用SurfaceEvolver软件进行了数值模拟 ,并利用实际试验结果对该模型进行了修正 ,修正过的未熔透型熔池模型为今后定量、系统地模拟多种条件下未熔透型熔池中各液面的形态规律 ,以此建立熔池上液面的特征量与熔深的对应关系 ,这种特征量和对应关系为今后的熔透控制的实现奠定了基础。

The qualitative analysis was carried out on the behavior of the partial penetrated weld pool with welding current changing from pulsed peak value to base value during pulsed TIG welding. The mathematical model of the liquid surface shape of the pool was developed. The numerical simulation process based on this model is finished by Surface Evolver, a FEM simulation software. Both the simulation results and the model are then modified with experimental results. The modified model lays the foundations for performing systematical and qualitative simulation on the liquid surface morphology of the pool under various conditions, and for obtaining the relationship between the feature value of upper liquid surface and the depth of the pool.