As a common processing method in modern manufacturing industry, laser cutting machine breaks the traditional processing method and is widely used in various industries with a new cutting method, especially fiber laser cutting machine
Users who know fiber laser cutting machine should know that it must use auxiliary gas in the cutting process. That is why many people are more concerned about the issue of “gas”.
Today I will share with you the gas used for fiber laser cutting.
Why do we need to add auxiliary gas during processing?
Before figuring out how to choose auxiliary gas, we must first understand why auxiliary gas is used and the role of auxiliary gas. After experience summary: In addition to blowing away the slag in the coaxial slit, the use of auxiliary gas can also cool the surface of the processed object, reduce the heat-affected zone, cool the focusing lens, and prevent smoke from entering the lens seat to contaminate the lens and cause the lens to overheat; in addition, some cutting gases can also protect the parent material. The choice of gas pressure and type has a great influence on the cutting process. The type of auxiliary gas will have a certain impact on the cutting performance, including cutting speed, cutting thickness, etc.
The auxiliary gases that can be used in laser cutting machines mainly include air, nitrogen, oxygen and argon. Below, Huazu Laser will introduce the uses and characteristics of different auxiliary gases.
1. Air
Air can be directly provided by an air compressor, so it is very cheap compared to other gases. Although air contains about 20% oxygen, the cutting efficiency is far less than that of oxygen, and the cutting capacity is similar to that of nitrogen. A trace oxide film will appear on the cutting surface, but it can be used as a measure to prevent the coating layer from falling off. The end face of the cut is yellow.
The main applicable materials are aluminum, aluminum alloy, stainless copper, brass, electroplated steel plate, non-metal, etc. However, when the quality requirements of the cutting product are high, aluminum, aluminum alloy, stainless steel, etc. are not suitable for air because air will oxidize the parent material.
2. Nitrogen
When cutting some metals, oxygen will form an oxide film on the cutting surface. Using nitrogen can prevent the oxide film from appearing without oxidation. As a result, it has the characteristics of being able to be directly welded, applied, and having strong corrosion resistance. The end face of the cut is white.
The main applicable plates are stainless steel, electroplated steel, brass, aluminum, aluminum alloy, etc.
3. Oxygen
Mainly used for laser cutting of carbon steel. While using the heat of oxygen reaction to greatly improve the cutting efficiency, the generated oxide film will increase the beam spectrum absorption factor of the reflective material. The cut end face is black or dark yellow.
Mainly applicable to rolled steel, rolled steel for welding structure, carbon steel for mechanical structure, high tension plate, tool plate, stainless steel, electroplated steel, copper, copper alloy, etc.
4. Argon
Argon is an inert gas. It is used to prevent oxidation and nitridation in laser cutting machine cutting. It is also used in welding. Compared with other processing gases, it is expensive and increases the cost accordingly. The cut end face is white.
The main applicable materials are titanium, titanium alloy, etc.
In the above content, many gases can be used universally. The key is to consider the cutting cost and the requirements for the product. For example, when cutting stainless steel materials, when the quality or surface quality of the product is not very high, such as the cutting product needs to go through painting and other processing procedures, air can be used as the cutting gas, which can reduce a lot of costs. When the cutting product is the final product and there is no subsequent process, it is necessary to use protective gas, such as process products. Therefore, in the process of cutting and blanking, it is necessary to select the gas according to the characteristics of the product.
Post time: Sep-27-2024
