As a common processing method in modern manufacturing industry, laser cutting machine breaks the traditional processing method and is widely used in all walks of life with a new cutting method, especially fiber laser cutting machine, which has developed "rocket-like" in recent years.
Users who know fiber laser cutting machine should know that it must use auxiliary gas in the cutting process, which is why many people are more concerned about the issue of "gas".
So, today, DA DI CNC editor will take you to talk about why auxiliary gas should be added in the cutting process of fiber laser cutting machine and how users can use auxiliary gas reasonably.
Why 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 choice of auxiliary gas type will have a certain impact on the cutting performance, including cutting speed, cutting thickness, etc.
Characteristics of auxiliary gas
The auxiliary gases that can be used by laser cutting machines are mainly air, nitrogen, oxygen and argon. Below we will introduce the uses and characteristics of different auxiliary gases to you. (For your reference only)
1.Air
Air can be directly provided by an air compressor, so it is very cheap compared to other gases. Although the 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. Therefore, it can be directly welded, coated, and has strong corrosion resistance. The end face of the cut is whitish.
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 end face of the cut 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 plate, 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 end face of the cut is whitish.
The main applicable materials are titanium, titanium alloy, etc.
Selection of auxiliary gas
In the above content, many gases can be used universally. The key is to consider the cutting cost and product requirements. 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 process processing procedures, air can be used as the cutting gas, which can reduce a lot of costs. When the cut product is the final product and there is no subsequent process, a protective gas is required, such as process products. Therefore, in the process of cutting and cutting, the gas must be selected according to the characteristics of the product.
DADI CNC focuses on the research and development, production, sales and technical services of fiber laser cutting machines. It has accumulated many years of experience in the industry. It has a full set of solutions in the direction of cutting applications and continues to conduct in-depth research. If you are interested in our fiber laser cutting machine, please contact us
