Effect of Auxiliary Gas on Metal Laser Cutting Quality
The auxiliary gas can not only blow away the slag in time but also play the role of cooling the workpiece and cleaning the lens. Different auxiliary gases can be used to change the cutting speed and the surface quality of the kerf. It is of great significance for the cutting of special metals.
Selection of auxiliary gas
Generally, compressed air is suitable for the cutting of aluminum, non-metallic and galvanized steel sheets, which can reduce the oxide film and save costs to some extent. It is used when the cutting plate is not very thick, and the requirements of cutting end face is not too high, such as some sheet metal chassis, cabinets, and other product industries.
Nitrogen is an inert gas that prevents oxidation of the cut end face of the product during cutting and prevents combustion (it is easy to occur when the sheet is thick. Nitrogen can be selected for products that require high cutting end faces and are not treated. For example, some decorative industries, aviation special parts such as aerospace;
Oxygen mainly acts as a combustion aid, which allows the laser cutting machine to increase its speed during cutting and thicken the cutting thickness. Oxygen is suitable for thick plate cutting, high speed cutting and very thin plate cutting, such as some large carbon steel plates and some thick carbon steel structural parts, can use oxygen.
Effect of auxiliary gas purity on metal laser cutting quality
The purity of nitrogen affects the quality of the cut. Water will cause damage to the laser, so the gas level should be at least 4.5.
Practice has shown that A 2% reduction in oxygen purity reduces the cutting speed by 50% and results in significantly worse cut quality.
Effect of auxiliary gas pressure on metal laser cutting quality
1) When the pressure of the cutting gas is too high, the cutting surface is rough and the slit is wide; meanwhile, the cut section is partially melted, and a good cutting section cannot be formed.
2) When the pressure of the cutting gas is insufficient, the melt is generated during cutting, and the cutting speed cannot satisfy the production efficiency.
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