变极性脉冲熔化极氩弧焊双向高压叠加控制

Dual and High Voltage Reiterative Control of Variable Polarity Pulse Metal Inert Gas

变极性脉冲熔化极氩弧(MIG)焊在其变换电弧极性时电弧是再引燃的物理过程,需要叠加双向高压脉冲以保证电弧可靠再引燃。研究了逆变弧焊电源的逆变结构及二次功率逆变电路的控制模式,设计了叠加双向高压稳弧脉冲的电力电路及其控制模式。试验表明,采用设计的变极性控制系统及双向高压稳弧脉冲叠加控制系统焊接铝合金时,系统运行稳定,完全达到了焊接可靠再引燃电弧的需要。

Variable polarity pulse metal inert gas（MIG）welding is designed to make the arc reignition process being stabile when varying arc polarity.The reiterative dual and high voltage pulse is used to guarantee the arc reignition credibility.The structure of inverter arc welding power supply and the control mode of secondary inversion circuit are researched.The power circuit and control mode of reiterative dual and high voltage stabilization arc pulse are also designed.The experimental results show that the steady welding procedure can be obtained with the reiterative dual and high voltage pulse control mode and the reignition arc is stabilized when welding aluminum alloy.