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Plasma Cutting Machine Application FAQs approach
Plasma arc cutting machine directly affects the stability of the cutting quality, instability of the plasma arc, can cause uneven cut, product defects such as tumors, the control system will lead to reduced life related components, printheads, frequent replacement of the electrode. For this phenomenon, analyze and propose solutions:
A. Pressure is too low
Plasma cutting machine work, such as working pressure is far below the required specification pressure, which means that the ejection velocity plasma arc weakened, input air flow is less than the predetermined value, then can not form high-energy, high-speed plasma arc, resulting in poor quality of cut, cut impervious, cut buildup phenomenon. Insufficient air pressure causes are: lack of input air compressor, air regulator valve regulator cutting machine is too low, the solenoid valve has oil, gas path is not smooth and so on.
The workaround is to use the former to observe compressor output pressure display, if not met, adjust the pressure or compressor overhaul. If the input has reached the required pressure, check the air filter regulator adjusted correctly, gauge display can meet the cutting requirements. Otherwise deal with air filter regulator routine maintenance to ensure that the input air is dry, no oil. If you enter the air quality is poor, it will cause the solenoid valve to generate oil, valve open difficulties valve port can not be fully opened. In addition, the torch printhead pressure is too low, the need to replace the solenoid valve; pneumatic smaller cross-section can also cause pressure is too low, according to the specification requirements replace the trachea.
B. Pressure is too high
If the input air pressure far exceeds 0.45MPa, in the form of plasma-arc, excessive concentration of air being blown arc column, so that the arc column energy dispersion, weakening the strength of the plasma arc cutting. Caused by excessive pressure causes: improper input air regulator, air filter regulator is too high or the air filter regulator failure.
The workaround is to check whether the right to adjust the pressure air compressor, air compressor and air filter regulator whether the pressure imbalance. Boot, such as a rotary air filter regulator switch, gauge unchanged, indicating that the air filter regulator failure, need of replacement.
C. Burning torch printhead and electrode
Due to improper installation printheads, such as threaded not tighten the device to adjust the gear properly, need water cooled torch at work, did not seek to pass into the flow of cooling water and frequent arcing will cause premature failure of the printhead.
The solution is cutting the workpiece in accordance with the technical requirements of the gear equipment properly adjusted, check the torch printhead is installed securely imprison, need cooling water through the cooling water circulation printhead should advance together. Cutting, adjust the thickness of the workpiece between the torch and the workpiece distance.
D. AC input voltage is too low
The use of plasma cutting machine has a large field of electricity facilities, cutting internal main circuit component failures, etc., causes the input AC voltage is too low.
The workaround is to check plasma cutting machines connected to the grid have sufficient carrying capacity, power cord specifications meet the requirements. Plasma cutting machine installation location should be away from electrical equipment and often have large electrical interference. Use, should be cleaned regularly cutting machine dust and dirt on the component, check the wiring if there is aging phenomena.
E. Ground poor contact with the workpiece
Grounding is an essential preparation before cutting work. Unused dedicated ground tool, the workpiece surface insulation aging and long-term use of such serious ground, the ground will cause poor contact with the workpiece.
The use of specialized tools to be ground, and check the ground insulation effect surface contact with the workpiece, to avoid aging ground.
F. Not automatically broken arc sparker
Plasma cutting machine work, the first plasma arc ignition, the high-frequency oscillator excitation electrodes and the inner wall of the gas printhead, a high frequency discharge, the gas is partially ionized form small arc, this small arc by the compressed air effect, from the printhead to ignite a plasma arc, which is the main task sparker. Under normal circumstances, the working hours sparker only 0.5 ~ 1s, not automatically break arc causes the control circuit board components generally offset, a discharge electrode gap sparker inappropriate.
Should always check the spark generator discharge electrode, so that the surface remains flat, adjust the spark generator discharge electrode gap (0.8 ~ 1.2mm), if necessary, replace control board.
G. Other
In addition to these reasons, the cutting speed is too slow, cutting torch and the workpiece verticality, as well as the operator of the plasma cutting machine familiarity, operational level, etc., all affect the stability of the plasma arc, users should note that in these areas .
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