Three auxiliary gases for laser cutting machine XT Laser Vicky
There are usually three auxiliary gases for laser cutting machines: oxygen, air and nitrogen. Different auxiliary gases use to cut different materials. Depending on the thickness of the cutting material, the pressure and flow rate of the auxiliary gas are also the same. And the pressure of the auxiliary gas has a direct effect on the laser cutting effect. The auxiliary gas can blow away the molten slag in time when the laser cutting machine is running. Cool the workpiece and clean the lens. Different auxiliary gases are suitable for cutting metal sheets of different materials and thicknesses.
1. The Oxygen
Oxygen has a strong combustion-supporting effect, so it can accelerate the speed of laser cutting and increase the thickness of the cutting. The Oxygen is suitable for thick plate cutting, high-speed cutting and very thin cutting. For example, some large carbon steel plates and some thick carbon steel structural parts can use oxygen.
2. Nitrogen
When oxygen use for cutting, an oxide film formed to increase the light speed spectrum absorption factor of the reflective material. And the end face of the cut to black or dark yellow. The use of oxygen will prevent the formation of oxide film. The non-oxidized cutting surface has the characteristics of direct welding and painting, strong corrosion-resistance, etc., And the cut end surface is white.
3. Air
The air contains about 20% oxygen, and the air compressor can be used to compress the air without cost. However, the efficiency and quality of air-assisted cutting is far less than that of oxygen. At the same time, a trace oxide film will appear on the cut surface. It uses for cutting metal materials such as aluminum, aluminum alloy, brass, and electroplated steel plate.
Increasing the gas pressure of the laser cutting machine can increase the cutting speed, but after reaching a maximum value, continuing to increase the gas pressure will cause the cutting speed to drop. Under high auxiliary gas pressure, the reason for the decrease in cutting speed can not only attributed to the enhancement of the cooling effect of the laser action area by the high air velocity, but also the interference of the intermittent shock wave existing in the airflow on the laser action area cooling.