【摘要】 建立了等离子弧焊静止电弧的三维有限元数学模型,考虑等离子气、保护气的作用,利用ANSYS有限元分析软件对电弧的温度场、速度场、压力以及阳极工件表面的电流密度等进行了数值模拟,并与TIG焊进行了比较。结果表明,由于喷嘴的约束作用,等离子弧焊与TIG焊相比,电弧温度显著提高,焊接电流为150A时电弧最高温度达到30000K。等离子弧焊的另一个显著特点是等离子体流速和电弧压力显著增大。通过计算马赫数、有效粘度和动力粘度之比,认为等离子体电弧处于层流不可压缩状态。更多还原

【Abstract】 Three dimensions finite element mathematical model for the PAW arc was established by considering the effect of plasma gas and shielding gas. The temperature and velocity of the arc were simulated using ANSYS FEA software, as well as the distributions of arc pressure and current density at the anode surface.Compared with the TIG welding arc, the simulated results show that the temperature of the PAW arc is remarkably enhanced. The highest temperature is 30,000K at a current of 150A. The other distinct character of the PAW arc is that the arc velocity and pressure is much higher. The PAW arc can be dealt in a laminar incompressible state judged by the Mach number and the ratio of effective viscosity and dynamic viscosity.更多还原