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In the carbon steel cutting process, the influence of three auxiliary gases on the cutting process

In the carbon steel cutting process, the influence of three auxiliary gases on the cutting process
When the laser cutting machine cuts carbon steel, it usually uses auxiliary gas to assist the operation. Common auxiliary gases are oxygen, nitrogen and air. What is the difference between these three gases when cutting carbon steel?
In order to understand the influence of each auxiliary gas on the cutting process, it is necessary to clarify the working principle of the auxiliary gas. The advantages of using air cutting in the first place are obvious, and there is no cost. When using air, you only need to consider the electricity cost of the air compressor and the equipment itself, eliminating the high cost of auxiliary gas. The cutting efficiency of thin plates can be compared with nitrogen cutting, which is an economical and efficient cutting method. But air cutting also has obvious shortcomings in the section. First, there will be burrs on the cut surface, which requires secondary processing to clean up, which is not conducive to the entire product production cycle. Second, the cut surface will be black, affecting the quality of the product. Laser processing itself has the advantages of efficiency and quality accuracy, and the disadvantages of air cutting have led many customers to abandon this cutting method.

Secondly, oxygen cutting is used, which is the most common and traditional cutting method. The advantages of the fiber laser cutting machine using oxygen are mainly reflected in the cost of gas. In the processing of sheet metal mainly carbon steel, the auxiliary gas does not need to be replaced frequently, which increases the cutting efficiency and facilitates management. But the disadvantage is that after oxygen cutting, an oxide film will remain on the surface of the cut surface. If this product with an oxide film is directly welded, the oxide film will naturally peel off after a long time, and the product will form a virtual welding, affecting the welding quality.

Finally, nitrogen cutting is used. When oxygen is used as an auxiliary gas, an oxide film will be formed on the cutting surface. Nitrogen can prevent the appearance of the oxide film and form an oxide-free cutting. The surface of non-oxidative cutting is generally white, and can be directly processed by welding, spraying, etc. The strong corrosion resistance also makes its application surface very wide.
In summary, when cutting carbon steel thick plates above 6mm, only oxygen cutting is supported. When cutting below 6mm, if there are clear requirements for cutting quality and accuracy, it is recommended to use nitrogen cutting, which not only has high cutting efficiency, but also can directly carry out the next processing process. When cutting below 6mm, if only cutting is considered or there are no clear process requirements, air cutting is recommended, with zero gas cost.

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