焊接参数对GTAW旋转电弧性能影响的数值分析

Effect of welding parameters on GTAW rotational arc performance based on numerical analysis

以旋转GTAW电弧为研究对象,根据磁流体动力学理论,构建旋转GTAW电弧的数学模型。利用有限元分析软件FLUENT对三维旋转电弧的温度场、压力场和速度场进行分析计算,研究焊接参数对旋转电弧性能的影响。得到焊接电流和旋转频率对电弧形态和z轴轴线上电弧物理量影响的曲线图。为验证模拟结果是否符合实际情况,利用高速相机得到不同焊接参数下的电弧形态。在合理的参数范围内,焊接电流增大,电弧偏转变小;旋转频率增大,电弧整体偏转增大,尤其是电弧低温区。

Based on the rotational arc of gas tungsten arc welding,a mathematical model of rotational arc was constructed by using magnetohydrodynamics theory. The temperature field,pressure field,and the velocity field of three-dimensional rotational arc were calculated and analyzed by using finite element analysis software FLUENT. The influence of welding current and rotational frequency on arc shape and arc physical quantity diagram on z axis was obtained. In order to verify the rationality of the simulation results,the arc shape under different welding parameters was photographed by high-speed camera. Under the reasonable parameter range,arc deflection angle decreases with the increase of the welding current. Integral deflection angle of the arc increases with the rotational frequency increasing,especially in low temperature region.