【摘要】 以直流TIG焊接电弧为对象,依据磁流体动力学理论构建电弧的数学模型,运用ANSYS有限元分析软件对二维稳态下轴对称的、氮氩混合气体保护的TIG焊接电弧进行了数值分析,得到了φ(N2)50%+Ar混合气体保护下焊接电弧的温度场、速度场的形态分布特征。分析表明,氮氩电弧的最高温度出现在近阳极区域,电流密度、等离子体速度和电弧压力的最大值均出现在近阴极区。同时分析了不同电流、弧长对阳极表面电流密度的分布的影响,随着电流的增大,阳极表面电流密度增大,而随着弧长的增大,电流密度减小。更多还原

【Abstract】 N2-Ar protecting tungsten inert gas(TIG)welding arc is chosen as the studied object. A mathematic model is developed according to the theory of magnetic fluid dynamics. TIG welding arc is numerically analyzed based on this 2D, static and axisymmetric model with ANSYS software and the temperature and velocity profiles of the φ(N2)50%+Ar protecting arc have been simulated. The analysis indicates that the max-temperature of the arc appears near the anode and the max-current density, the max-velocity of the plasma and the max-arc pressure appear near the cathode. The influences of different current and arc length on the distribution of current density on anode are analyzed. The current density increases with the increasing of current and diminishes with the increasing of arc length.更多还原