Apr. 16, 2021
When laser cutting machine processes metal, the most widely used materials are stainless steel and carbon steel. Compared with aluminum alloy, brass and other highly reflective metals, these two metals have better light absorption, so laser cutting is more widely used.
What are the differences between stainless steel and carbon steel processed by powerful laser cutting machine? What material is most suitable for laser cutting machine?
The cutting process is very different
When using laser cutting machine to process stainless steel, because stainless steel contains 10% - 20% chromium, iron and chromium are easy to have exothermic reaction with oxygen during cutting. The chromium oxide has the characteristics of preventing oxygen from entering the molten material, which reduces the amount of oxygen entering the molten layer, incomplete oxidation of the molten layer, reduces the reaction, and reduces the cutting speed.
When using laser cutting machine to process carbon steel, oxygen is usually used as auxiliary gas. More than 99% of low carbon steel cutting is iron. The oxidation reaction of iron will also produce a lot of heat. Using oxygen as auxiliary can reduce the requirement of laser energy, and the melting point viscosity of oxide is low, so that the adhesion to the surrounding steel plate is also low. Such slag is also easy to be oxidized by oxygen Blow open, leaving a smooth section without residue.
Different material processing skills
When laser cutting mirror stainless steel, it is necessary to stick laser film to prevent serious scald. Although there is membrane protection, there will be a little scald on the edge. At this time, it is necessary to strictly control the laser cutting process parameters in the processing process to maintain the good corrosion resistance of such materials. The most important process parameters affecting the cutting quality of stainless steel are cutting speed, laser power, oxygen pressure and focus.
With the improvement of cutting machine power, laser cutting machine can process thicker and thicker carbon steel. When cutting thicker low carbon steel plate, larger diameter nozzle and low pressure oxygen pressure are needed, which can prevent the edge of the cut from burning.
Compared with low carbon steel, stainless steel cutting needs higher laser power and oxygen pressure. Although stainless steel cutting achieves satisfactory cutting effect, it is difficult to obtain completely slag free cutting seam. Using inert gas as auxiliary gas to cut stainless steel can obtain non oxidation cutting edge, which can be directly used for welding, but its cutting speed is reduced by about 10% compared with oxygen as auxiliary gas.
Compared with the traditional processing method, laser cutting machine has higher processing efficiency and can realize mass production, so it is more widely used in the processing of stainless steel and carbon steel. Both kinds of metals are suitable for laser cutting, but the processing efficiency and processing quality need to be constantly adjusted to make the equipment reach the best state.