In addition to blowing away the slag in the coaxial slit, the auxiliary gas used in the laser cutting machine can also cool the surface of the processed object, reduce the heat affected zone, cool the focus lens, and prevent the smoke from entering the lens base to pollute the lens and cause the lens to overheat; In addition, some cutting gases can also protect the base metal. The auxiliary gases that can be used by the laser cutting machine mainly include oxygen, nitrogen, air and argon. Let's introduce the different auxiliary gases:

1. Air: ① used as cutting gas; ② Used as cooling optical fiber laser cutting head; ③ It is used as dust removal inside the optical path (to protect the lens and extend the service time of the lens);

2. Common oxygen: the purity of the gas (combustion-supporting) used for cutting carbon steel is 99.5%;

3. Pure nitrogen: 99.9% purity of gas (cooling) used for cutting stainless steel (cutting carbon steel at 3/4 speed);

4. High purity nitrogen: as the gas used in laser, purity: 99.999%;

5. High purity helium: as the gas used in laser, purity: 99.999%;

6. High purity carbon dioxide: as the gas used in laser, purity: 99.999%.

According to different materials and cutting requirements, different cutting auxiliary gases are used to achieve good cutting quality.