氮氩气体保护TIG焊接电弧数值分析

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50%N2 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.并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,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.

Numerical analysis of N2-Ar protecting tungsten inert gas welding arc

N_2-Ar protecting tungsten inert gas(TIG) welding arc was chosen as the studied object.A mathematic model was developed according to the theory of magnetic fluid dynamics.TIG welding arc was numerically analyzed based on this 2D,static and axisymmetric model with ANSYS software and the temperature and velocity profiles of the 50%N_2 Ar protecting arc have been simulated.And the difference of the temperature,pressure and velocity of the arc between 50%N_2 Ar protecting arc and Ar protecting arc has been obtained.The results show that the temperature,pressure and velocity of the arc could rise adding N_2 as protesting gas and higher energy density arc can be got.