固定电弧等离子弧焊接热传导的数值计算

Numerical Simulation of Heat Transfer Based on PHOENICS During Stationary Plasma Arc Welding Process

针对固定电弧等离子弧焊接过程建立了二维稳态热传导模型 ,在模型中考虑了工件表面与周围环境换热及辐射散热对整个焊接热过程的影响 ,并且将焊接电流在流经工件时产生的焦耳热作为热能方程的源项进行计算。针对所建立的模型 ,采用大型商业软件PHOENICS(Parabolichyperbolicorellipticnumericalintegrationcodeseries)对工件中的温度场以及电流密度的分布进行了计算。采用该软件对焊接热过程进行数值模拟 ,可以很方便地对求解变量和边界条件进行操作 ,显著提高了效率。比较结果显示 。

A two-dimensional steady numerical model is developed for the heat transfer in stationary plasma arc welding process. The model considers the radiant heat loss and the heat exchange between the workpiece surface and the ambience, and takes the Joule heat, resulted from the welding current flowing through the workpiece, as the source term of the energy equation. Based on the developed model, the large commercial software PHOENICS is employed to simulate the temperature and current density distribution in the workpiece. Using the software, it's conveniently and highly active to operate the independent variables and the boundary conditions. The comparisons show that the simulated results agree well with the experimentally measured results.