Laser cutting machines use different auxiliary gases to cut different materials. The thickness of the cutting material is different, the pressure of the auxiliary gas and the required flow rate are different, and the pressure of the auxiliary gas has a direct impact on the result of laser cutting.
The working gas of the laser is used to generate laser light; the protective gas is used to protect the optical devices and drive the shutter. The working gas of the laser is mixed with helium, nitrogen and carbon dioxide gas in a certain ratio. This ratio is predetermined in 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 can change the cutting speed and the surface quality of the slit. It is of great significance to the cutting of special metals. The types of auxiliary gases are oxygen, air, nitrogen and argon.
Air nitrogen is used as a protective gas during cutting to prevent oxidation film formation; argon is used for titanium metal cutting.
Air is suitable for cutting aluminum, non-metal and galvanized steel. To a certain extent, it can reduce the oxide film and save costs. It is generally used when the cutting plate is relatively not thick, and the cutting end face is not too high. It is often used in the product industry.
Nitrogen is an inert gas, which prevents oxidation of the cutting end surface of the product when cutting, and prevents combustion (prone to occur when the sheet is thick). Nitrogen can be selected for products that require high cutting end faces and do not need to be exposed. Such as some decoration industry, aerospace and other special parts;
Oxygen mainly plays a role in supporting combustion. It can make the speed faster and the thickness of the cutting thicker. Oxygen is suitable for thick plate cutting, high-speed cutting and ultra-thin plate cutting. For example, some large carbon steel plates and some thick carbon steel plate structural parts can use oxygen.
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