How to choose auxiliary gas for laser cutting machine equipment?

How to choose auxiliary gas for laser cutting machine equipment?
Laser cutting machines should be equipped with auxiliary gases, mainly oxygen, nitrogen and air, during use. When the fiber laser cutting machine processes the work, it irradiates with the laser focus, the irradiation area is instantly melted and vaporized, and then the spot irradiation position is moved by the numerical control device to realize automatic cutting.

1. Compressed air.
Air is suitable for cutting aluminum and galvanized steel sheets, which can reduce the oxide film to some extent and save costs. It is commonly used when the cutting plate is not relatively thick and the cutting end face is not too high.
2, nitrogen.
Nitrogen is an inert gas that prevents the cut end face of the product from oxidizing during cutting and prevents combustion (thick sheets are more likely to occur. Products that require a high cut end face and are exposed without processing. You can choose nitrogen for.
3. Oxygen.
Oxygen primarily serves to support combustion, increasing the speed during cutting and increasing the thickness of the cutting. Oxygen is suitable for thick plate cutting, high speed cutting, and thin plate cutting. For example, oxygen can be used in some large carbon steel sheets and some thick carbon steel structures.
Increasing the gas pressure will increase the cutting speed, but if you continue to increase the gas pressure after reaching the set value, the cutting speed will decrease. When the auxiliary gas pressure is high, the reason why the cutting speed decreases is that the wind speed is high and the cooling effect of the working area is high, and the intermittent shock wave existing in the airflow interferes with the cooling of the laser working area. It may be.
When the pressure and temperature of the airflow become non-uniform, the density of the airflow field changes. Such a density gradient results in a change in the index of refraction of the field, thereby narrowing the focus of the beam energy and causing refocusing or beam divergence. This interference affects melting efficiency and can change the modal structure, which can reduce cutting quality if the beam diverges too much. Making the light spot too large can even cause serious consequences that cannot be cut effectively.
Application of auxiliary gas:
1. Compressed air: Widely used for processing some sheet metal chassis, cabinets, cabinets and other products.
2, Nitrogen: Part of the decoration industry, processing of aerospace and other parts.

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