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

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.