The characteristics, uses and scope of application of different auxiliary gases are as follows:
(1) Oxygen cutting can play a combustion supporting effect. The oxygen reaction heat in the cutting process can greatly improve the cutting efficiency. The generated oxide film will improve the beam spectral absorption index of the reflective material, so that the laser energy can be used more effectively and speed up the cutting speed of the laser cutting machine. It is mainly suitable for thick plate cutting, such as carbon steel, stainless steel, alloy metal, etc.
(2) Nitrogen when some metals are cut with nitrogen, an oxide film will be formed on the cutting surface, and the use of nitrogen can avoid the appearance of oxide film and conduct oxidation-free cutting. The oxidation-free cutting mask has the characteristics of direct welding and coating, and strong corrosion resistance. The end face of the incision is white. The main applicable plates are stainless steel, electroplated steel plate, brass, aluminum and aluminum alloy, etc.
(3) Air is a kind of mixed gas containing nitrogen, oxygen and other gases. The collection method is relatively simple. It is compressed into the air storage tank with an air compressor and can be extracted after filtration, cooling and drying, which requires less cost. It is mainly used in the processing of metal sheet. Depending on the energy of laser, the metal workpiece is melted, the melt is blown away by high pressure, and the air assisted cutting of the workpiece section will produce oxidation reaction and form metal oxide. It is mainly suitable for cutting carbon steel, aluminum, aluminum alloy, brass, galvanized steel plate and other metal materials.
(4) Argon argon is an inert gas, which is used to prevent oxidation and nitridation in laser cutting machine cutting, and can also be used in welding. Compared with other processing gases, the price is higher, which will increase the cost accordingly. The end face of the incision is white. The main applicable materials are titanium and titanium alloys.
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