脉冲磁场作用下GMAW电弧动态过程分析  

Analysis of the Arc Dynamic Process in GMAW Under the Influence of Pulsed Magnetic Field

作　　者：白韶军[1] 陈树君[1] 刘长辉[1] 王丽鹏[1] 黄鹏飞[1] 

机构地区：[1]北京工业大学机械工程与应用电子技术学院,北京100124

出　　处：《北京工业大学学报》2013年第7期971-975,共5页Journal of Beijing University of Technology

基　　金：国家自然科学基金资助项目(50205001);光机电装备技术北京市重点实验室资助项目(KF2010-02)

摘　　要：针对熔化极气体保护焊短路过渡焊接过程不均匀、电弧稳定性差、飞溅较大且焊缝成形欠佳的缺点,建立了横向脉冲辅助磁场,使其作用于短路过渡焊接过程的熔滴短路时刻,根据短路过渡周期Tc及变异系数CV,优化了辅助磁场MIG/MAG焊接工艺参数.实验表明:当脉冲磁场持续时间ton取值为特定焊接参数下短路时间T1的统计平均值时,短路过渡周期趋于均匀,电弧短路过渡周期Tc及变异系数CV降低,短路过渡液桥加速断开,短路峰值焊接电流降低,从而使短路过渡末期能量积累以及电爆炸飞溅几率降低,并且使熔滴过渡过程稳定.In the gas metal arc welding process with short circuiting transfer mode has un-regularity, poor arc stability, larger spatter, and poor weld form, the horizontal pulsed auxiliary magnetic field in the short circuiting transfer welding process was established. According to short circuiting transfer period To and its coefficient of variation CV, optimize the applied auxiliary magnetic field and the MIG/MAG welding process parameters. The controlled auxiliary magnetic field can reduce both of the arc short circuiting transfer period To, and the coefficient of variation CV. When the statistical average of the pulsed magnetic field duration ton take value for the specific welding parameters short circuiting time T1 , making short circuiting transfer period tends to be uniform. The experiments show that make the applied magnetic field strength appropriate arc short circuiting transfer period To and the coefficient of variation CV lower, it can accelerate the disconnection of the short circuiting transfer liquid bridge, reduce the short circuiting peak welding current, thereby reducing the energy accumulation at the end of the short circuiting transfer, so as to reduce the electrical explosion spatter loss rate of the process and keep the metal transfer stable.

关 键 词：脉冲磁场 熔化极气体保护焊 高速摄像 短路过渡 电弧稳定性 

分 类 号：TG403[金属学及工艺—焊接]