论文部分内容阅读
基于磁流体动力学理论建立GTAW电弧的二维稳态轴对称模型,通过FLUENT14.5软件对不同电流和不同氩气流量下的电弧特性进行数值模拟,模拟得到不同焊接电流条件下电弧的温度场、速度场、压力场、电流密度和工件表面的总热流量。结果表明:当电流增加时,电弧区能量升高,电弧的参数均会增大;氩气流量的增加,电弧等离子体的最高温度先升高后降低。为获得更高的温度场,有一个合适的气体流量范围,电弧压力有小幅增加,但氩气流量的改变对其他参数的影响不大,可见在电弧区电磁力占主导因素。
Based on the theory of magnetohydrodynamics, a two-dimensional steady-state axisymmetric model of GTAW arc was established. By using FLUENT14.5 software, the arc characteristics under different current and argon flow were numerically simulated, and the temperature field of arc under different welding current , Velocity field, pressure field, current density, and total heat flux on the workpiece surface. The results show that when the current increases, the energy of arc zone increases and the parameters of arc increase. When the flow rate of argon increases, the maximum temperature of arc plasma first increases and then decreases. In order to obtain a higher temperature field, there is a suitable gas flow range with a slight increase of arc pressure. However, the change of argon flow has little effect on other parameters. It can be seen that the electromagnetic force in the arc zone is the dominant factor.