摘要
以直流正极性氩氮混合工作气体等离子焊接电弧为研究对象,依据磁流体动力学理论构建电弧的数学模型,运用有限元分析软件ANSYS建立了三维稳态下轴对称的、氩氮混合工作气体的1/2等离子焊接电弧的数学模型,得到了焊接电弧的温度场、电场、电磁场、速度场的形态分布特征。分析了氩氮混合工作气体等离子弧的特性,并与纯氩气时的等离子弧的温度场及阳极热流密度分布进行了对比。结果表明,采用混合离子气时,等离子电弧的弧心最高温度相对于纯氩气时有所提高,另外弧柱区的高温区向阳极偏移,阳极的热流密度相对增加。
Aimed at Ar-N2 plasma welding arc, a mathematic model was established according to the theory of magnetic fluid dynamics. PA welding arc was numerically analyzed by the 3D, static and axisymmetric model with ANSYS software. The temperature, electromagnetic force and velocity profiles of the Ar-N2 protecting arc have been simulated. The characteristic of the Ar-N2 protecting plasma welding arc was analyzed and compared with the Ar protecting plasma arc. The results show that with the mixed plasma gas the maximum temperature of the arc is higher than that of the Ar plasma arc. And the maximum temperature area leans to the anode.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2008年第8期17-20,共4页
Transactions of The China Welding Institution
基金
国家自然基金资助项目(50475126)
