The laser cutting machine uses different auxiliary gases to cut different materials. The pressure and flow rate of auxiliary gas vary with the thickness of cutting material. The pressure of auxiliary gas directly affects the result of laser cutting. The working gas of the laser is used to generate the laser. The shielding gas is used to protect the optical device and drive the shutter. The working gas of the laser is mixed with helium, nitrogen and carbon dioxide in a certain proportion, which is predetermined by the factory to ensure the best performance; The auxiliary gas can not only blow away the slag in time, but also cool the workpiece and clean the lens. The use of different auxiliary gases will change the cutting speed and the surface quality of the slit, which is of great significance for the cutting of special metals. The types of auxiliary gases are oxygen, air, nitrogen and argon. When cutting, air and nitrogen can be used as protective gas to prevent the formation of oxide film; Argon is used for titanium cutting.
● Compressed air
Air is suitable for cutting aluminum, non-metallic and galvanized steel. To some extent, it can reduce the oxide film and save the cost. It is usually used when the cutting plate is relatively not thick and the cutting end face is not too high. It is widely used in some sheet metal cabinets and other industries.
● Nitrogen
Nitrogen is an inert gas, which can prevent the oxidation of the cutting end face of the product during cutting and prevent burning (burning is easy to occur when the sheet is thick). Nitrogen can be selected for products that require higher cutting end faces and do not require exposure. Such as some special parts for decoration industry, aerospace, etc.
● Oxygen
Oxygen is mainly used to support combustion. It can increase the cutting thickness and cutting speed. Oxygen is mainly used for thick plate cutting, high-speed cutting and ultra-thin plate cutting. For some larger carbon steel plates and some thicker carbon steel plate structural parts, oxygen can be used.