【摘要】 在薄板铝合金变极性脉冲MIG中,两个电极材料均为冷阴极材料,电极发射电子困难,当极性发生变换时,尤其是在小电流过零时更容易出现电弧熄灭现象。针对此问题,设计了一种全桥式高压脉冲稳弧电路,可提供双向高压稳弧脉冲,在电弧过零时直流高压电源通过IGBT开关管施加一个瞬间的高压脉冲,能可靠再引燃电弧,使变极性脉冲MIG的焊接过程不会出现断弧现象,保证了焊接过程稳定。更多还原

【Abstract】 During the variable polarity pulsed MIG welding process of thin sheet of aluminum alloy,both the electrodes are cold cathode,the arc is easy to distinguish when polarity varies especially the current crosses zero.So a full bridge high voltage arc stabilized circuit is developed.A transient high voltage pulse is generated by DC high voltage power supply when the current crosses zero,the arc is stabilized by re-ignition and the arc-halting is avoided.The steady welding procedure can be obtained.更多还原