Plasma is a gas heated to extremely high temperature and highly ionized. It will transfer the arc power to the workpiece. The high heat will melt and blow off the workpiece to form the working state of plasma arc cutting. After the compressed air enters the cutting torch, it is distributed by the gas chamber to form plasma gas and auxiliary gas. The plasma gas arc melts the metal, while the auxiliary gas cools all parts of the cutting torch and blows away the melted metal. The cutting power supply includes two parts: main circuit and control circuit. The electrical principle block diagram is shown in the figure: the main circuit includes contactor, three-phase power transformer with high leakage reactance, three-phase bridge rectifier, high-frequency arc striking coil and protective elements. High leakage reactance leads to steep external characteristics of power supply. The control circuit completes the whole cutting process through the button switch on the cutting torch: pre ventilation – main circuit power supply – high frequency arc striking – cutting process – arc stopping – stop. The power supply of the main circuit is controlled by the contactor; The opening and closing of gas is controlled by solenoid valve; The control circuit controls the high frequency oscillator to ignite the arc, and stops the high frequency after the arc is established. In addition, the control circuit also has the following internal locking functions: 1. The thermal control switch acts and stops working. Cutting fault 1) incomplete cutting: A: the thickness of the plate exceeds the applicable range of the equipment. B: cutting speed is too fast. C: the inclination of the cutting torch is too large. D: the compressed air pressure is too high or too low. E: the grid voltage is too low. 2) unstable plasma arc: A: the cutting torch moves too slowly. B: the two-phase power supply reduces the working voltage. C: the compressed air pressure is too high

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