细丝大电流MAG焊接机理  

Mechanism of Thin Wire High Current MAG Welding

作　　者：华爱兵 殷树言[2] 陈树君[2] 白韶军[2] 张晓亮[2] 

机构地区：[1]北京中电华强焊接工程技术有限公司,北京100076 [2]北京工业大学机械工程与应用电子技术学院,北京100124

出　　处：《机械工程学报》2010年第16期142-147,共6页Journal of Mechanical Engineering

摘　　要：借助高速摄像机研究不同保护气氛下(98%Ar+2%O2、T.I.M.E.气体、80%Ar+20%CO2)细丝大电流MAG焊的电弧形态及熔滴过渡特征,并在此基础上通过分析液锥和焊接电弧的受力情况,建立液锥的运动模型,同时指出液锥与焊接电弧的空间位置关系以及这两者的运动相关性。研究结果表明,细丝大电流MAG焊的液锥运动属于自磁旋转,即液锥在电极磁场力和电弧力的作用下偏离焊丝轴线一定角度并绕焊丝轴线高速旋转。液锥偏角的相对大小由电弧烁亮区包覆液锥的面积决定,当电弧烁亮区包覆液锥的面积增大时,液锥偏角反而变小,焊接过程的稳定性增强。驱动电弧高速旋转的力是由液锥磁场提供的,电弧偏角及其旋转角速度分别与液锥偏角和液锥旋转角速度密切相关。With the high speed camera,the characteristics of thin wire MAG welding process with high current density including arc shape and droplet transfer are researched.Through analyzing the force of liquid metal cone and arc,the motion model of liquid metal cone is given.Also the spatial position relationship and the motion correlation of liquid metal cone and arc are pointed out.The result shows that the motion style of the liquid metal cone belongs to self-magnetic rotating which means the liquid metal cone deviates from the wire axis by a certain angle and makes high speed rotation around the wire axis under the actions of electrode magnetic force and arc force.The relative size of deflection angle of liquid metal cone is determined by the area of liquid metal cone enclosed by the arc shining zone.When this area increases,the deflection angle becomes smaller and the stability of welding process is enhanced.The driving force of high speed rotation of arc is supplied by the magnetic filed of liquid metal cone,and the arc deflection angle and arc rotating angular velocity are closely related to the deflection angle and rotating angular velocity of liquid metal cone respectively.

关 键 词：细丝大电流 MAG 焊 电极磁场力 液锥 

分 类 号：TG403.4[金属学及工艺—焊接]