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Plasma Cutting Machine Works

Apr 13, 2018

Plasma cutting machine works:


Plasma is a gas that is heated to a very high temperature and is highly ionized. It transfers the arc power to the workpiece. The high heat causes the workpiece to melt and blow away, creating a plasma arc cutting operation.

After the compressed air enters the torch, the air chamber distributes two paths, namely plasma gas and auxiliary gas. The plasma gas arc acts as a molten metal, and the auxiliary gas cools the various parts of the torch and blows away the molten metal.

The cutting power source includes two parts: a main circuit and a control circuit. The electrical principle includes: a main circuit including a contactor, a three-phase power transformer with high leakage resistance, a three-phase bridge rectifier, a high-frequency pilot coil and a protection element. The high leakage inductance leads to a sharp external power source. The control circuit completes the entire cutting process by means of a button switch on the torch:

Pre-ventilation - main circuit power supply - high-frequency arc ignition - cutting process - interest arc - stop.

The power supply of the main circuit is controlled by the contactor; the shortness of the gas is controlled by the solenoid valve; the control circuit controls the high-frequency oscillator to ignite the arc and stops the high frequency after the arc is established.