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为了研究交变纵向磁场作用下MIG焊接电弧的物理特性,提高焊接质量,分析了交变纵向磁场作用下电弧带电粒子的受力情况和运动状态,并利用高速摄像手段研究了交变纵向磁场对电弧形态的影响。结果表明,无外加交变纵向磁场时,自由电弧稳定燃烧,电弧轴线与焊丝轴线相重合;当加入交变纵向磁场时,电弧围绕焊丝轴线做逆时针和顺时针交替变化的旋转运动,电弧轴线偏离焊丝轴线;随着励磁电流的增加,电弧的旋转半径增大,电弧偏离焊丝轴线的角度增大,电弧烁亮区域面积减小;当励磁电流为30 A时,电弧的最大偏转角度为45°,此时电弧燃烧变得不稳定,甚至息弧,焊接过程不稳定。
In order to study the physical properties of MIG welding arc under alternating longitudinal magnetic field and improve the welding quality, the force and movement state of the charged particles under alternating longitudinal magnetic field are analyzed. The effect of alternating longitudinal magnetic field pairs Effect of arc shape. The results show that when there is no alternating longitudinal magnetic field, the free arc will burn steadily, and the arc axis coincides with the axis of the welding wire. When the alternating longitudinal magnetic field is added, the arc will rotate counterclockwise and clockwise alternately around the axis of the welding wire. With the increase of magnetizing current, the radius of rotation of the arc increases, the angle of the arc deviates from the axis of the welding wire increases, and the area of the arc shining area decreases. When the excitation current is 30 A, the maximum deflection angle of the arc is 45 ° , Then the arc burning becomes unstable, even arc, the welding process is not stable.