The auxiliary gas suitable for the material to be cut must be added during the cutting process of the laser cutting machine. In addition to blowing away the slag in the slit, the coaxial gas can also cool the surface of the processed object, reduce the heat affected zone, cool the focus lens, and prevent smoke and dust from entering the lens base to pollute the lens and cause overheating of the lens. REDSAIL laser reminds you that selecting the type of auxiliary gas will have a certain impact on the cutting performance, including cutting speed and cutting thickness, so you should pay special attention to the selection of auxiliary gas.
The characteristics, uses and application scope of different auxiliary gases are as follows:
（1）O2
It is mainly used for cutting carbon steel with laser cutting machine. The O2 reaction heat can not only improve the cutting efficiency in large format, but also increase the spectral absorption factor of the reflective material. The end face of the incision is black or dark yellow. REDSAIL laser reminds you that auxiliary gas O2 cutting is mainly applicable to rolled steel, rolled steel for welding structure, carbon steel for mechanical structure, high tension plate, tool plate, stainless steel, galvanized steel plate, copper and copper alloy, etc.
（2）N2
Some metals are cut with O2, which will form oxide film on the cutting surface, while N2 can avoid the appearance of oxide film and conduct non oxidation cutting. The non oxidation cutting mask has the characteristics of direct welding and coating, strong corrosion resistance, etc. The end face of the incision is white. REDSAIL laser reminds you that the auxiliary gas N2 cutting is mainly applicable to stainless steel, galvanized steel plate, brass, aluminum and aluminum alloy.
(3) Air
As air can be directly supplied by air compressor, it is very cheap compared with other gases. Although the air contains about 20% O2, the cutting efficiency is far less than O2, and the cutting capacity is similar to N2. A small amount of oxide film will appear on the cutting surface, but it can be used as a measure to prevent the coating layer from falling off. The end face of the incision is yellow. REDSAIL laser reminds you that auxiliary gas air cutting is mainly applicable to aluminum, aluminum alloy, stainless steel, brass, electroplating steel and non-metal materials.
（4）Ar
Ar is an inert gas, which is used to prevent oxidation and nitridation in laser cutting, and can also be used in welding. Compared with other process gases, the price is higher, which will increase the cost accordingly. The end face of the incision is white. REDSAIL laser reminds you that the auxiliary gas Ar cutting is mainly applicable to titanium and titanium alloys.
