Auxiliary gas of laser cutting machine
When cut different metal materials, laser cutter needs different auxiliary gas. And for different thickness of metals, it needs different air pressure and gas flow. That means to choose right auxiliary gas and gas pressure are directly effect result of laser cutting.
The assist gas can not only blow away the slag on metal material in time, but also cool the it and clean the lens.
The main types of auxiliary are oxygen, air and nitrogen.
O2 air mainly plays a role of combustion support, it can increase the speed of cutting and the thickness of cutting. Oxygen is suitable for thick metal cutting, high speed cutting and extremely thin metal cutting. For example, such as some thicker carbon steel plates, could use oxygen air. When cutting metals of different materials and thickness, choosing the suitable gas can help to shorten the cutting time and improve the cutting effect.
2. Compressed air
Air is suitable for cutting aluminum, non-metallic and galvanized steel plates. To some extent, it can reduce oxide film and save cost. It is generally use to cut plate is not thick, and the requirement for cutting end face is not too high. It is used in some products such as sheet metal case, cabinet, and so on.
Nitrogen is mainly used for cutting stainless steel, aluminum and copper to prevent blackening of the cut surface after oxidation. As a protective gas, nitrogen can remove the slag from the cut section, protect the cutting lens, improve surface quality and prevent decarburization.