基于金属蒸汽和外加磁场的MIG电弧模拟

Simulation of MIG arc based on metal vapor and external magnetic field

熔化极惰性气体保护焊中,高温电弧使焊丝部分蒸发成蒸汽,基于磁流体动力学模拟了金属蒸汽和外加纵向磁场下的MIG电弧。结果表明:金属蒸汽改变了电弧温度分布和温度梯度,温度峰值降幅达23.6%;外加纵向磁场强度每增加0.01 T,金属蒸汽在工件表面的覆盖半径减小约12.9%,外加磁场可控制低碳钢焊接烟尘中含量最多的铁蒸汽分布。

In the process of MIG welding,the high temperature of the arc causes the welding wire to partially evaporate to form metal vapor. This paper simulated the MIG arc considering the metal vapor and the external longitudinal magnetic field based on magnetohydrodynamics. The results show that the metal vapor changes the temperature distribution and temperature gradient of the arc,and the peak temperature decreases by up to 23.6%. When the intensity of the applied longitudinal magnetic field increases by 0.01 T,the coverage radius of the metal vapor on the surface of the workpiece decreases by about 12.9%. The external magnetic field can influence the distribution of iron vapor,the main component in the welding fume of low carbon steel.