What gas is used for fiber laser cutting machine, oxygen or nitrogen?

Why add auxiliary gas when fiber laser cutting machine is cutting metal materials? There are four reasons. One is to cause the auxiliary gas to chemically react with the metal material to increase the strength; the second is to help the equipment blow away the slag from the cutting area and clean the kerf; the third is to cool the adjacent area of ​​the kerf to reduce the heat-affected zone. Size; The fourth is to protect the focusing lens and prevent combustion products from contaminating the optical lens. So what are the auxiliary gases commonly used in fiber laser cutting machines? Can air be used as auxiliary gas?

When the fiber laser cutting machine is cutting thin metal plates, three types of gases, nitrogen, oxygen, and air, can be selected as auxiliary gases. Their functions are as follows:

Nitrogen: When cutting colored plates such as stainless steel or aluminum, nitrogen is selected as an auxiliary gas, which can play a role in cooling and protecting the material. When used, the section of the cut metal is brighter and the effect is good.

Oxygen: When cutting carbon steel, oxygen can be used, because oxygen has the function of cooling and accelerating combustion and speeding up cutting. The cutting speed is the fastest of all gases.

Air: In order to save costs, you can use air to cut stainless steel, but there are subtle burrs on the reverse side, just sand it with sandpaper. That is to say, when the fiber laser cutting machine is cutting certain materials, air can be selected as the auxiliary gas. When using air, an air compressor must be selected.

However, laser cutting experts recommend, for example, a 1000-watt fiber laser cutting machine. 1mm carbon steel and stainless steel is best cut with nitrogen or air, the effect will be better. Oxygen will burn the edges, the effect is not ideal.