【摘要】 以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、氩氮混合气体保护的TIG焊接电弧进行了数值分析,得到了30%N2+70%Ar(体积分数)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。通过与纯氩气保护的TIG焊接电弧温度、压力以及等离子体速度等分布的比较,得出了加入氮气作为保护气体时的TIG焊接电弧能量及形态的分布变化。对比结果表明,加入氮气作为保护气体,提高了TIG焊接电弧的电弧温度、等离子体速度和电弧压力,能得到更高能量密度的焊接电弧。更多还原

【Abstract】 N2-Ar protecting tungsten inert gas(TIG) welding arc was chosen as the studying object.A mathematic model was developed according to the theory of magnetic fluid dynamics.TIG welding arc was numerically analyzed based on this 2D,steady and axisymmetric model with ANSYS software and the temperature and velocity profiles of the 30%N2+Ar protecting arc was simulated.And the difference of the temperature,pressure and plasma velocity of the arc between different N2+Ar protecting arc and Ar protecting arc was obtained.The results provide that the temperature,pressure and plasma velocity of the arc can raised if N2 is got in with protecting gas,and much more capacity density arc can be obtained.更多还原