(1) Contact the torch roller with the workpiece, and adjust the distance between the nozzle and the workpiece plane to 3 ~ 5 mm (when the main machine is cutting, turn the "thickness selection" switch to high grade).
(2) Turn on the torch switch, ignite the plasma arc, and after cutting through the workpiece, move to the cutting direction at a uniform speed. The cutting speed is: on the premise of cutting through, it should be fast rather than slow. Too slow will affect the quality of incision and even break the arc.
(3) After cutting, turn off the torch switch and the plasma arc goes out. At this time, compressed air will be sprayed out in a delay time to cool the torch. After a few seconds, it automatically stopped spraying. Take off the cutting torch and complete the whole cutting process.
2, manual contact cutting
(1) As for the "thickness selection" switch, it is used for cutting thin plates by single machine.
(2) Place the torch nozzle at the starting point of workpiece cutting, turn on the torch switch, ignite the plasma arc, cut through the workpiece, and then move at a constant speed along the longitudinal cutting direction.
(3) After cutting, turn the torch switch on and off. At this time, the compressed air is still spraying, and it will automatically stop spraying after a few seconds. Take off the cutting torch and complete the whole cutting process.
Extended data
Cutting specification
1, no-load voltage and arc column voltage
The plasma cutting power supply must have a high enough no-load voltage to easily ignite the arc and make the plasma arc burn stably. The no-load voltage is generally 120-600V, and the arc column voltage is generally half of the no-load voltage. Increasing the voltage of arc column can obviously improve the power of plasma arc, so it can improve the cutting speed and cut metal plates with greater thickness. By adjusting the gas flow rate and increasing the internal shrinkage of the electrode, the arc column voltage is often not reached, but the arc column voltage cannot exceed 65% of the no-load voltage, otherwise the plasma arc will be unstable.
2. Cutting current
Increasing cutting current can also improve the power of plasma arc, but it is limited by the maximum allowable current, otherwise the plasma arc column will become thicker, the slit width will increase and the electrode life will be reduced.
3. Gas flow rate
Increasing the gas flow can not only increase the arc column voltage, but also enhance the compression effect on the arc column, so that the plasma arc energy is more concentrated and the injection force is stronger, thus improving the cutting speed and quality. However, if the gas flow is too large, the arc column will be shortened, the heat loss will increase, and the cutting ability will be weakened until the cutting process cannot be carried out normally.
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