摘要
间接电弧焊接是一种新型的焊接方法,具有高效、节能、焊接应力和变形小的优点。为了研究间接电弧的电弧参数的分布特点以及这种焊接方法热输入低的根本原因,利用有限元分析软件,建立双钨极间接电弧的三维有限元数学模型,计算得到双钨极间接电弧的温度、等离子体流速、电弧压力以及热流密度分布等特征参数;通过高速摄像拍摄到的电弧形态照片与计算得到的温度云图对比验证模拟结果的可信性。结果表明双钨极间接电弧面对称且向阳极方向偏转,呈上宽下窄的倒钟罩形态,阳极一侧的各项特征参数大于阴极一侧;与惰性气体钨极保护(Tungsten inert gas arc,TIG)焊接和等离子弧焊接相比,双钨极间接电弧被焊接工件不接电极,主要靠热流密度、等离子体流速、电弧压力等参数都比较低的弧柱区端部加热,造成工件焊接热输入低、熔深浅。
Indirect arc welding is a novelty welding method with advantages of high efficiency, energy saving, low welding stress and deformation. In order to study the arc parameters distribution and the root cause of the low heat input of this novelty welding method, three dimensions finite element model for the indirect arc is established by finite element analysis sol, rare. The temperature, velocity and pressure distribution of twin-tungsten indirect arc are obtained. The simulation result is compare with those photos obtained from high-speed camera, and verified the reliability of simulated method. The results show that the twin-tungsten indirect arc deflected to the anode side, the shape of the arc is similarity to inverted bell. The arc parameter of the indirect arc in cathode side is smaller than that of anode side. The parameters of the arc column are much smaller than that of anode surface of TIG welding and plasma arc welding. In the welding process, the work piece doesn＇t connect electrodes and is mainly heated by the end of the arc column area in where the parameters mentioned above are far smaller than cathode region and anode region is the fundamental reason for low welding heat input and welding penetration.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2013年第22期97-102,共6页
Journal of Mechanical Engineering
基金
国家自然科学基金资助项目(51171093)
关键词
计算机模拟
有限元法
电弧
双钨极间接电弧焊接
Computer simulation Finite element method Electric arcs Twin-tungsten indirect arc welding
