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When laser cutting machines process metals, the most widely used materials are stainless steel and carbon steel. Compared with metals with high reflectivity such as aluminum alloy and brass, these two metals have better light absorption, so laser cutting It is more and more widely used.
What are the differences between a powerful laser cutting machine when processing stainless steel and carbon steel? What material is most suitable for cutting with a laser cutting machine? Come to battle~
When using a laser cutting machine to process stainless steel, because stainless steel contains 10%-20% of chromium, iron and chromium are prone to exothermic reaction with oxygen during cutting. The chromium oxide has the characteristic of preventing oxygen from entering the molten material. The amount of oxygen entering the melting layer is reduced, the melting layer is incompletely oxidized, the reaction is reduced, and the cutting speed is reduced.
When using a laser cutter to process carbon steel, oxygen is usually used as an auxiliary gas. More than 99% of the cutting of low carbon steel is iron. The oxidation reaction of iron will also generate a lot of heat. Using oxygen as an auxiliary can reduce the laser energy In addition, the low melting point viscosity of the oxide reduces the adhesion to the surrounding steel plate. Such slag can also be easily blown away by oxygen, leaving a smooth section with no residue.
When laser cutting mirror stainless steel, in order to prevent the sheet from being severely burned, a laser film is required. Although it is protected by a film, there will still be a slight burn on the edge. At this time, it is necessary to strictly control the laser cutting process parameters during the processing to maintain the good corrosion resistance of such materials. The most important process parameters that affect the quality of stainless steel cutting are cutting speed, laser power, oxygen pressure and focus.
As the power of the cutting machine increases, the laser cutting machine can process thicker and thicker carbon steel. When cutting thicker low-carbon steel, a larger diameter nozzle and low-pressure oxygen pressure are required to prevent cutting problems. Burn out the edge of the incision.
Compared with low carbon steel, stainless steel cutting requires higher laser power and oxygen pressure. Although stainless steel cutting achieves a satisfactory cutting effect, it is difficult to obtain a completely slag-free kerf. Using inert gas as auxiliary gas to cut stainless steel can obtain oxidation-free trimming, which can be directly used for welding, but its cutting speed is about 10% lower than that of oxygen as auxiliary gas.
Compared with traditional processing methods, laser cutting machines have higher processing efficiency and can achieve mass production. Therefore, they are more and more widely used in the processing of stainless steel and carbon steel. Both metals are suitable for laser cutting processing, but the processing is present. Efficiency and processing quality require constant exploration and adjustment to make the equipment reach the best condition.