Feb 16, 2020
When it comes to what kind of gas the fiber laser cutting machine uses, we must first understand why the fiber laser cutting machine needs auxiliary gas.
In addition to blowing off the slag in the coaxial slit, the auxiliary gas of the fiber laser cutting machine can also cool the surface of the processing object, reduce the heat affected zone, cool the focusing lens, and prevent smoke and dust from entering the lens to contaminate the lens. In addition, some cutting gases can also protect the base material. The choice of gas pressure and type has a greater impact on the cutting process. Choosing the type of auxiliary gas will have a certain effect on the performance of the cutting machine, including cutting speed and cutting thickness.
Since the auxiliary gas plays such an important role in the operation of the fiber laser cutting machine, it is especially important to choose which auxiliary gas.
There are mainly three commonly used laser cutting auxiliary gases, oxygen, nitrogen and air, and oxygen and nitrogen as conventional cutting gases.
Oxygen is mainly used for carbon steel cutting and perforation of stainless steel and aluminum plates. It mainly oxidizes with the cutting metal and emits a lot of oxidation heat. In addition, a certain pressure of gas will blow away the oxide and slag, forming a cut in the metal. Since the oxidation reaction during the cutting process generates a lot of heat, the cutting does not require too much power. The disadvantage is that the cutting speed of the thin plate is slow, and it is easy to overburn when cutting sharp corners.
Nitrogen is mainly used for cutting stainless steel and aluminum plates. If the laser power is large enough, the cutting speed of nitrogen for carbon steel plates will be greatly increased. The role of nitrogen in the cutting process is to prevent the oxidation reaction and use its high pressure to blow away the molten material, so you can get a brighter section effect, of course, the effect of sharp corners will be better. The disadvantages are high gas cost and slow cutting speed of thick plates.
The air itself exists in the air. I only need an air compressor to compress it into an air storage tank, and then use it after filtering, cooling and drying. The main costs are electricity and equipment maintenance. The main component of air is a mixture of about 80% nitrogen and 20% oxygen, so air can make up for the deficiency of oxygen and nitrogen to a certain extent.
These auxiliary gases have different effects, and the required costs are also different. Therefore, you should evaluate and select the appropriate gas according to your needs.