增量型PID恒流恒压控制的Plasma-MIG复合电弧焊接

Plasma-MIG hybrid arc welding with PID increment constant current or voltage control algorithm

Plasma-MIG复合电弧焊接对电源的外特性输出及焊接过程控制有着很高的要求,以VC++软件开发工具为平台,推导了适合于Plasma-MIG复合电弧焊接的增量型PID控制算法,实现了对复合电弧焊接过程控制及电源外特性的要求.结果表明,增量型PID恒流恒压控制能够满足Plasma-MIG对电源外特性的输出要求.Plasma电弧和MIG电弧并不是相互独立的,两者以共享的电磁空间、导电气氛和焊丝为媒介建立起耦合关系.Plasma-MIG复合电弧焊接过程中,增量型PID控制下的Plasma电弧能够自发的调节自身电参数,来稳定电弧空间的电流密度,使得焊接过程中无飞溅.采用控制后,Plasma-MIG复合电弧焊焊接过程焊缝铺展好,焊接过程稳定,焊缝成形好.

Output characteristics of the power supply and welding process control are important factors for plasma-MIG hybrid arc welding.PID increment control algorithm suitable for Plasma-MIG hybrid arc welding was developed based on VC++ language in this paper,which optimized the output characteristics of the power supply and welding process control.The results show that the plasma arc and MIG arc were coupled with each other by sharing the electro-magnetic space,gas and filler metal.Plasma arc controlled by PID increment control algorithm was capable of stabilizing the current density through the arc due to its self-adjusting function,without sputtering in the welding process.High stability,molten metal with excellent liquidity and weld with smooth surface were realized by plasma-MIG hybrid arc welding with PID increment control algorithm.