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Plasma cutting cutting specification
Source: | Author:pmt22d4f9 | Publish time: 2018-12-12 | 5 Views | Share:

Various plasma arc cutting process parameters directly affect the stability of the cutting process, cutting quality and effect. The main cutting specifications are briefly described as follows:
No-load voltage and arc column voltage
The plasma cutting power supply must have a sufficiently high no-load voltage to facilitate arc ignition and stable combustion of the plasma arc. 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 the arc column can significantly increase the power of the plasma arc, thereby increasing the cutting speed and cutting a larger thickness of the metal sheet. The arc column voltage is often achieved by adjusting the gas flow rate and increasing the electrode internal shrinkage, but the arc column voltage cannot exceed 65% of the no-load voltage, otherwise the plasma arc will be unstable.
Cutting current
Increasing the cutting current also increases the power of the plasma arc, but it is limited by the maximum allowable current, otherwise the plasma arc column becomes thicker, the slit width increases, and the electrode life decreases.
Gas flow
Increasing the gas flow rate can increase the arc column voltage and enhance the compression of the arc column, so that the plasma arc energy is more concentrated and the ejection force is stronger, thereby improving the cutting speed and quality. However, if the gas flow rate is too large, the arc column will be shortened, and the loss of heat will increase, so that the cutting ability is weakened until the cutting process is not performed normally.
Electrode shrinkage
The so-called shrinkage refers to the distance from the electrode to the end face of the cutting tip. The proper distance can make the arc get good compression in the cutting nozzle, and obtain a plasma arc with concentrated energy and high temperature for effective cutting. If the distance is too large or too small, the electrode will be severely burnt, the cutting nozzle will burn out and the cutting ability will be reduced. The amount of shrinkage is generally 8-11mm.
Cutting height
The height of the cutting tip refers to the distance from the end face of the cutting tip to the surface of the workpiece being cut. This distance is generally 4 to 10 mm. It has the same amount of shrinkage as the electrode, and the distance should be appropriate to fully utilize the cutting efficiency of the plasma arc, otherwise the cutting efficiency and the cutting quality will be lowered or the cutting nozzle will be burned out.
Cutting speed
The above various factors directly affect the compression effect of the plasma arc, that is, the temperature and energy density of the plasma arc, and the high temperature and high energy of the plasma arc determine the cutting speed, so the above various factors are related to the cutting speed. Under the premise of ensuring the cutting quality, the cutting speed should be increased as much as possible. This not only increases productivity, but also reduces the amount of deformation of the cut parts and the heat affected area of the slotted area. If the cutting speed is not suitable, the effect is reversed, and the slag is increased, and the cutting quality is lowered.
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