Arc starting method of Plasma cutting machine

Cutting generally refers to the cutting of metal. A plasma cutting machine is a cutting method that uses a very thin and high-temperature plasma arc to quickly melt the local metal and then blow the molten metal away with an airflow. The X-axis adopts a high-precision linear circular guide rail, and the Y-axis adopts a high-precision linear guide rail, which has less running resistance. The straightness error of the two rails of the X-axis is guaranteed to be less than ±0.05mm, and the vertical error of the X-axis and Y-axis is not more than ±0.05mm. The running trolley adopts a lightweight structure. Under the action of air pressure, voltage, and magnetic field, the columnar free arc (which can be compressed into a plasma arc, the conductive section of the plasma arc has a small energy concentration. The gas in the arc column can almost reach the ion state. The arc temperature can be as high as 15000℃-30000 ℃. It can quickly melt metal and other objects. 

The plasma cutting machine has two arc starting methods:

1. Contact arcing

2. Transfer arc starting

Contact arc

Plasma cutting machine contact type: the nozzle insulated from the pole needle is attached to the workpiece (connected to the positive end of the cutting power supply), and then high-frequency and high-voltage current is applied to the electrode needle (tungsten needle) connected to the negative end of the power supply so that the pole needle emits an electric arc. The plasma arc is formed under the action of voltage, air pressure, and magnetic field. The plasma arc is maintained to burn stably through a large current, and then the nozzle is slightly raised (to avoid damage to the nozzle by the hot workpiece), and the cutting method is most suitable for a small current (low power)Plasma cutting machine.

Transfer arc

Plasma cutting machine transfer arc type (dimensional arc type): connect the positive end of the power supply to the nozzle through a certain resistance and a relay switch, so that an arc is formed between the pole needle and the nozzle (due to the resistance current limit, the arc is small), and then the nozzle is close On the workpiece that is directly connected to the positive end of the power supply, an arc with greater energy is formed between the pole needle and the workpiece. After the arc is compressed, a plasma arc is formed, the connection between the nozzle and the positive end of the power supply is disconnected and cutting begins. The transfer arc cutting method can prevent the arc from deviating from the center of the nozzle under the action of air pressure and damaging the nozzle. This method is suitable for high-power Plasma cutting machines.

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