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How to choose auxiliary gas for laser cutting equipment?

Views:3     Author:heyu     Publish Time: 2020-05-16      Origin:Leapion fiber laser cutting machine

  The laser cutting machine needs to be equipped with auxiliary gas, mainly oxygen, nitrogen and air. When the optical fiber laser cutting machine processes the workpiece, it will be illuminated by the laser focal spot, and the irradiated area will be melted and gasified in an instant. Then, the position of the spot will be moved through the numerical control equipment system to realize automatic cutting.

  1. Compressed air.

  Air is suitable for cutting aluminum plate and galvanized steel plate. To some extent, it can reduce oxide film and save cost. Generally, it is used when the cutting plate is not relatively thick and the requirements for the cutting end face are not too high.

  2. Nitrogen.

  Nitrogen belongs to inert gas, which can prevent oxidation of product cutting end surface and combustion (easy to occur when the plate is thick). Nitrogen can be selected for products with high requirements for cutting end face and exposed without treatment.

  3. Oxygen.

  Oxygen mainly plays a combustion supporting role. It can increase the speed and thickness of cutting. Oxygen is suitable for thick plate cutting, high-speed cutting and thin plate cutting, such as some larger carbon steel plates and some thicker carbon steel plate structural parts, oxygen can be used.

  Increasing the gas pressure can improve the cutting speed, but after reaching a set value, increasing the gas pressure will cause the cutting speed to decrease. Under the high auxiliary gas pressure, the reason for the decrease of cutting speed can be attributed to not only the enhancement of cooling effect of high air flow velocity and hanging area, but also the interference of intermittent shock wave in the air flow on cooling of laser area.

  The uneven pressure and temperature in the air flow will cause the change of air field density. Such a density gradient results in the change of refractive index in the field, which can dry up the focus of beam energy and cause refocusing or beam divergence. This kind of interference will affect the melting efficiency, sometimes it may change the mode structure, resulting in the cutting quality degradation, if the beam divergence is too much. So that the spot is too large, even can not effectively cut the serious consequences.

  Application of auxiliary gas:

  1. Compressed air: it is widely used in the processing of some products such as sheet metal case cabinet and cabinet.

  2. Nitrogen: processing some decoration industry, aerospace and other parts;

  Laser cutting machines use different auxiliary gases to cut different materials. The pressure and required flow of the auxiliary gas vary with the thickness of the cut material.

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