In the cutting process of laser cutting machine, auxiliary gas is essential. We often use oxygen and nitrogen. And the higher the purity of gas, the better the cutting quality. There are also many customers who want to save cost and adopt air cutting. However, there is always water mist on the protective lens during the cutting process, and the cutting quality is poor. Why?

Firstly, you need to know the function of auxiliary gas.

• Blow away the residue and achieve the best cutting effect
• It can effectively achieve the effect of smooth cutting surface, no burr and slag hanging.
• Use gas to blow away the metal slag and protect the lens to avoid the slag sticking on the lens and affecting the cutting quality
• It can react with the material and increase the cutting speed. For example, the combustion supporting effect can be achieved by using oxygen

Although air can be used as auxiliary gas, but because air contains water and oil, if not treated, it will cause lens pollution, cutting head instability, so that cutting effect and quality are not up to standard. Therefore, in the use of air cutting, it is necessary to equip the fiber laser cutting machine with a cold dryer, which can solve this problem well.
The cold dryer can forcibly cool the compressed air below the required dew point temperature, so as to condense a large amount of water vapor and oil mist contained in it into liquid drops, and then discharge the compressed air out of the machine through the gas-liquid separation, so as to dry the compressed air.