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Why does the plasma arc cutting machine have to wait until the gas in the tube is released before cutting again when breaking the old arc?
1. Generally speaking, the air plasma cutting machine has frequent failures. Check the internal electrode of the cutting torch and adjust the electrode gap appropriately.

2. Then the compressed air pressure should be between 0.4 and 0.6 MPa, and the air moisture should be less.

3. If the pressure is too large or too small, it will automatically break the arc and stop working to protect the cutting torch from being burned out. It is necessary to adjust the rear air pressure adjustment knob to make it reach the appropriate pressure. It can work normally.

Extended data:

Maintenance of plasma arc cutting machine

Air pressure is too low.

When the plasma cutting machine is working, if the working air pressure is much lower than the air pressure required in the manual, it means that the jet speed of the plasma arc is weakened and the input air flow rate is less than the specified value. At this time, the plasma arc with high energy and high speed cannot be formed, resulting in poor incision quality, impenetrability and tumor accumulation.

The reasons of insufficient air pressure are: insufficient air intake of air compressor, too low pressure adjustment of air regulating valve of cutting machine, oil pollution in solenoid valve and unsmooth air passage. The solution is to observe the output pressure display of the air compressor before use. If it does not meet the requirements, adjust the pressure or repair the air compressor.

If the input air pressure meets the requirements, check whether the adjustment of the air filtration pressure reducing valve is correct and whether the pressure gauge can meet the cutting requirements.

Otherwise, the air filter pressure reducing valve should be maintained daily to ensure that the input air is dry and free of oil pollution. If the input air quality is poor, it will cause oil pollution in the solenoid valve, and the valve core will be difficult to open and the valve port will not be fully opened. In addition, the torch nozzle air pressure is too low, and the solenoid valve needs to be replaced; Reducing the cross section of the air passage will also cause the air pressure to be too low, so the air pipe can be replaced according to the requirements of the manual.

2. The air pressure is too high

If the input air pressure far exceeds 0.45MPa, after the plasma arc is formed, too much air will blow away the concentrated arc column, disperse the energy of the arc column and weaken the cutting strength of the plasma arc. The reasons for high air pressure are: improper air intake adjustment, excessive adjustment of air filter pressure reducing valve or failure of air filter pressure reducing valve.

The solution is to check whether the pressure of air compressor is properly adjusted and whether the pressure of air compressor and air filter pressure reducing valve is unbalanced. After starting, if the regulating switch of the air filter pressure reducing valve is turned, the gauge pressure does not change, indicating that the air filter pressure reducing valve is faulty and needs to be replaced. Input AC voltage is too low

There are large-scale power facilities in the use site of plasma cutting machine, and the failure of main circuit components inside the cutting machine will make the input AC voltage too low.

The solution is to check whether the power grid connected to the plasma cutting machine has enough current carrying capacity and whether the specifications of the power cord meet the requirements. The installation position of plasma cutting machine should be far away from large electrical equipment and places with frequent electrical interference. During use, it is necessary to regularly clean the dust in the cutting machine and the dirt on the components to check whether the wires are aging.

3. The nozzle and electrode of the welding torch are burnt out.

Due to improper installation of the nozzle, such as the screw thread is not tightened, the gear of the equipment is not adjusted well, the cutting torch that needs water cooling does not introduce flowing cooling water as required, and the nozzle is often hit, which will cause premature damage. ?

4. The grounding wire is in poor contact with the workpiece.

Grounding is an essential preparation before cutting. Without special grounding tools, the surface of the workpiece is insulated, and long-term use of seriously aging grounding wire will make the grounding wire and the workpiece have poor contact. Special grounding tools should be used, and check whether there is insulation that affects the contact between the ground wire and the workpiece surface, so as to avoid using aged ground wire.

5. The spark generator cannot automatically disconnect the arc.

When the plasma cutting machine works, the plasma arc should be ignited at first, and the gas between the electrode and the inner wall of the nozzle is excited by a high-frequency oscillator to generate high-frequency discharge, so that the gas is partially ionized to form a small arc, and the plasma arc is ignited by the compressed air. This is the main task of the spark generator.

Baidu encyclopedia-cutting machine

Baidu encyclopedia-plasma arc cutting machine