How to Achieve the Desired Effect when Cutting Stainless Steel with A Fiber Laser Machine

Stainless steel is a common metal in life. When processing stainless steel, many operators choose to use laser equipment. The most suitable way to cut stainless steel at present is laser cutting. Laser cutting technology is to irradiate the metal surface with a high-power-density laser beam to melt the irradiated material. At the same time, the coaxial high-speed gas will blow off the molten material to cut the workpiece.

Laser cutting of stainless steel normally produces higher-quality metal workpieces than that of traditional ways. But some users will encounter unsatisfactory cutting effects. This article analyzes the factors and solutions that affect the cutting effect of stainless steel for you. Hope to help you operate a fiber laser cutting machine.
 

Setting of cutting height and selection of cutting head nozzle

When cutting stainless steel, the cutting height is between 0.8mm-1.2mm. If the actual cutting height is not accurate, the operator needs to adjust the machine. Firstly, we need to choose the appropriate nozzle size and model according to the thickness of the stainless steel. Secondly, check whether the nozzle is damaged and whether the roundness is normal before laser cutting stainless steel. Finally, adjust the cutting parameters.

Check the cleanliness of the lens

Check whether the protective lens is clean. And it needs to be water-free, oil-free, and residue-free. Sometimes the protective lens will be fogged due to the weather or the low temperature of the auxiliary gas. Therefore, we must pay attention to cleaning the lens.
 

Prevent the workpiece from slagging

When laser cutting stainless steel, if there is only slag at the corners, corner rounding can be considered first. In terms of parameters, we can lower the focus and increase the pressure.

If the whole workpiece is covered with slag, it is necessary to lower the focus and increase the air pressure. But we should check whether the focus is too low or the air pressure is too high. Because the two factors will lead to delamination and roughness of the section.

If the whole object is covered with granular soft slag, we should increase the cutting speed or reduce the cutting power appropriately.

If slag hangs on the side near the end of cutting stainless steel, we need to check whether the gas supply is insufficient.
 

Plate quality and auxiliary gas

When laser cutting stainless steel, sometimes the section is not bright enough and rough.

If the section of the thin plate is not bright enough, first check the quality of the stainless steel. We need to ensure that the surface of the metal plate is free from rust, paint, and oxidation. Secondly, check the purity of the auxiliary gas to ensure that the oxygen purity is higher than 99.5%. In addition, we should also pay attention to using a small nozzle double-layer 1.0 or 1.2 when cutting sheet metal. And the cutting speed should be above 2m/min. Remember that the cutting air pressure should not be too large.

If the cutting section of the thick plate is rough, we must first ensure the quality of the plate and the purity of the gas. The second is the choice of nozzle. The larger the aperture, the better the section quality. However, the cross-sectional taper will increase with the hole diameter.
 

Conclusion

Compared with the traditional stainless steel cutting method, the fiber laser cutting machine is easier to operate and more efficient in processing. Through the above precautions, we can well avoid quality problems in cutting. It is believed that laser cutting machines will become more and more popular in the metal cutting process.
 
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