Plasma cutting with different working gases can cut a variety of oxygen cutting difficult to cut metal, especially for non-ferrous metals (stainless steel, aluminum, copper, titanium, nickel) cutting effect; its main advantage is to cut metal with a small thickness At the time, industrial use plasma cutting with different working gases can cut a variety of oxygen cutting difficult to cut metal, especially for non-ferrous metals (stainless steel "target=_blank> stainless steel, aluminum, copper, titanium, nickel) cutting effect; The main advantage is that when cutting a metal with a small thickness, the plasma cutting speed is fast, especially when cutting a normal carbon steel sheet, the speed can reach 5-6 times of the oxygen cutting method, the cutting surface is smooth, the heat deformation is small, and there is almost no heat. Affected area. Channel Drain Shower,Tile Insert Square Channel Drain,Anti Odor Stainless Steel Shower Drains,Tile Insert Adjustable Shower Kaiping City Jinqiang Hardware Products Co.,Ltd , https://www.kimpowerdrain.com
Plasma cutting machines are widely used in automobiles, locomotives, pressure vessels, chemical machinery, nuclear industry, general machinery, engineering machinery, steel structures and other industries.
Working gas plasma cutting has been developed to the present, the working gas (working gas is the conductive medium of the plasma arc, but also the heat carrier, while also eliminating the molten metal in the slit) on the cutting characteristics of the plasma arc and the cutting quality and speed There are obvious effects. Commonly used plasma arc working gases are argon, hydrogen, nitrogen, oxygen, air, water vapor, and certain mixed gases.
Cutting specifications Various plasma arc cutting process parameters directly affect the stability, cutting quality and effect of the cutting process. The main cutting specifications are briefly described as follows:
1. No-load voltage and arc column voltage: The plasma cutting power supply must have a high enough 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 not 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.
2. Cutting current: Increasing the cutting current can also increase the power of the 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 decrease.
3. Gas flow rate: Increasing the gas flow rate can not only increase the arc column voltage, but also 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.
4. 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 a 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.
5. Cutting tip height: The cutting tip height 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.
6. Cutting speed: The above various factors directly affect the compression effect of the plasma arc, which is the temperature and energy density of the plasma arc. 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 sticking slag is increased, and the cutting quality is lowered.
Security
1. Avoid direct visual arc cutting during plasma arc cutting. Wear professional protective glasses to avoid burns on the glasses by arc.
2. A large amount of toxic gas is generated during the plasma arc cutting process, and a multi-layered dust mask is required.
3. Towels, gloves, foot sheaths and other protective equipment should be worn during the plasma arc cutting process to prevent the burning of the skin by Mars.
4. In the process of plasma arc cutting, the high frequency and electromagnetic radiation generated by the high frequency oscillator will cause damage to the body. Some long-term practitioners may even have symptoms of infertility. Although the medical profession and the industry are inconclusive, it still needs protection. jobs.
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