Before knowing how to choose the auxiliary gas of laser cutting machine, we should first understand the use of auxiliary gas and the role of auxiliary gas. As follows:
1. The melted and gasified material is blown off the cut.
2. Inert auxiliary gas can prevent incision oxidation.
3.The active auxiliary gas can add heat to the cutting process.
4.Prevent material sputtered from the kerf from contaminating the focusing lens.
5.The plasma on the surface of the material is removed, and the absorption of the material to the laser beam is improved.
6. cool that area adjacent to the cut to reduce the size of the heat affected zone.
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Laser cutting machines use different auxiliary gases to cut different materials. The different thickness of the cutting material, the pressure of the auxiliary gas and flow requirements are not the same, auxiliary gas pressure on the laser cutting results have a direct impact.Laser cutting machine can use the auxiliary gas mainly oxygen, nitrogen, air and argon these kinds, the following for different auxiliary gas to introduce its use and characteristics. Oxygen is mainly used in laser cutting machine to cut carbon steel. The oxygen reaction heat is utilized to increase the cutting efficiency, and the generated oxide film can increase the light beam spectrum absorption factor of the reflecting material. The end of the incision is black or dark yellow.Applicable to rolled steel, rolled steel for welding structure, carbon steel for mechanical structure, high tension plate, tool plate, stainless steel, electroplated steel plate, copper, copper alloy and so on. Nitrogen Some metals can form an oxide film on the cutting surface by using oxygen when cutting, and non-oxidation cutting can be carried out by using nitrogen to prevent the oxide film from appearing. The non-oxidation cutting surface has the characteristics of direct welding and smearing, strong corrosion resistance and the like. The end face of the incision is whitish.The main applicable plates are stainless steel, plating plate, brass, aluminum, aluminum alloy and so on.
Air Air can be supplied directly by the air compressor, so the price is very cheap compared with other gases. There is about 20% oxygen in the air, and a trace of oxide film will appear on the cutting surface, but it can be used as a measure to prevent the coating from falling off. The end of the incision is yellow. The main applicable materials are aluminum, aluminum alloy, stainless copper, brass, plating plate, non-metallic and so on.Argon argon is an inert gas, used to prevent oxidation and nitriding in laser cutting machine cutting, also used in welding, compared with other processing gases, the price is higher, the corresponding increase in cost. The end face of the incision is whitish. The main applicable materials are titanium, titanium alloy and the like.
