Effect of different auxiliary gases on laser cutting

Laser cutting machines use different auxiliary gases to cut different materials. The thickness of the cutting material is different, and the pressure and flow of the auxiliary gas are different. 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 shielding 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, which 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, which is of great significance for the cutting of special metals. The types of auxiliary gas are oxygen, air, nitrogen, and argon. Air and nitrogen can be used as protective gas during cutting to prevent the occurrence of oxidation film; argon is used for titanium metal cutting.

● Compressed air

 Air is suitable for cutting aluminium, 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 widely used in some sheet metal cabinets and other industries.

● Nitrogen

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 higher cutting end faces and do not need to be exposed. Such as some decoration industry, aerospace and other special parts.

● 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 very thin plate cutting. For some larger carbon steel plate and some thicker carbon steel plate structural parts, oxygen can be used.

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