Research on arc stability control system for vacuum arc remelting furnace based on fuzzy-PID

Vacuum arc remelting furnace is an important equipment that smelting rare metal such as titanium and its alloys, the control of arc stability current has a great effect on the quality of ingot. According to the technological characteristics and control requirements of arc stability, a control system was built based on industrial personal computer (IPC), PLC and intelligent controller. The Fuzzy-PID strategy is proposed to control arc stability current, which realized accurate controlling of the current and rapid changes in positive and negative direction of stirring magnetic field. The practical application shows that this system play a good role in stable and precise controlling of arc stability current, stirring metal molten pool evenly and has a significant effect to improve crystallization of ingot.