【摘要】 在铝合金变极性穿孔焊接的工艺中,维弧对变极性电弧的行为有着重要影响。在反极性时间内,主电流会通过维弧电源经过喷嘴形成自由电弧,产生双弧现象,增大喷嘴的烧损,影响反极性电流对工件的阴极清理作用,甚至会产生主、维弧相干涉的现象。通过改善变极性电流的波形可以达到在焊接过程中引燃主电弧后,关断维弧,彻底解决主、维弧相干涉的问题。更多还原

【Abstract】 In variable plasma arc welding of aluminum, the behavior of variable polarity plasma arc is effected by pilot arc. In DCEP time, through the pilot source and the nozzle, large part of main current forms free arc not the plasma arc, so double arc happens, the nozzle is burn away and cathodic cleaning becomes symmetrical. In DCEP time, the interference of main arc and pilot arc happens sometimes. With new wave form of the main current, the pilot arc can be turned off after the main arc is ignited, so the arc interference is avoided and double arc will not happen.更多还原