When the fiber laser cutting machine is cutting, i’ts very important to select the different cutting gasesaccording to the material of the cutting plate. Therefore the choice of gas and pressure has a great impact on the quality of fiber laser cutting machines.

What are the auxiliary gases used in fiber laser cutting machines?

Auxiliary gases used in fiber cutting machines are mainly including oxygen, nitrogen and air. Using Nitrogen  to cut copper, aluminum, and stainless steel. Hoevery carbon steel needs to cut with oxygen generally. When using air cutting, there a 10 kW air compressor is required, and a 7.5 KW dryer and a tertiary filter are required too.

Effect of gas and pressure on cutting quality

1) The cutting gas helps to dissipate heat and assist combustion, and blows off the melt to obtain a better quality cut section.

2) When the pressure of the cutting gas is insufficient, the following effects will affect on the cutting quality. The melting will occur during cutting, and the cutting speed cannot meet the production efficiency.

3) When the pressure of the cutting gas is too high,  the cutting surface will be rough, and the slit will be wide; at the same time, will melt the cut section partially, and  cannot form a good cutting section.

The effect of the pressure of the cutting gas on the perforation

1) When the gas pressure is too low, the laser does not easily penetrate the cut sheet, and the punching time increases, resulting in low productivity.

2) When the gas pressure is too high, the penetration point is melted to form a large melting point, which affects the quality of the cutting.

3) When laser drilling, punching of the thin plate is applicalbe to the a higher gas pressure generally . And the punching of thick plate adopts the specific punching method . Thereby eliminating the disadvantage of the low air pressure to protect the lens.

4) When the laser cutting machine cuts ordinary carbon steel, the thicker the material, the lower the pressure of the cutting gas. When cutting stainless steel, the cutting gas pressure increases relatively with the thickness of the material.

In short, you needs to adjust the cutting gas and pressure according to the actual situation . In specific applications, also need to select the different cutting parameters according to the specific conditions.