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How to avoid burr in metal laser cutting?

Many professionals who work with laser cutting will know why the burr on the material comes out when working with the cut. But... What is burr? If we base ourselves on the Spanish dictionary definition, it is a "Portion of leftover material that protrudes irregularly on the edges or surface of any object; like the mortar that forms a highlight on the bricks when they are laid on site".

In our case, the burr is part of the material that is adhered to the edge of the piece during laser cutting and there are several ways to prevent it from coming out, but it is necessary to take into account some factors that are directly related to "the burr".

Today, metal fiber laser cutting machines are programmed to automatically control various laser parameters, such as beam power and profile. There are also other settings that can affect the quality of the cut and the technician or machine operator can configure it manually:

  1. Alignment of the beam by means of the alignment system.
  2. Focal Length
  3. Nozzle centering.
  4. Nozzle distance.
  5. Cutting speed.
  6. Laser frequency.

Most of these parameters are programmed automatically, there are three that should be adjusted to improve the cutting quality and thus avoid burr: gas pressure, focal length and cutting speed.

As far as the gas is concerned, whether it is nitrogen or oxygen that we are going to use, we have to make sure that it is as pure as possible. Oxygen must have a minimum purity of 99.95% and nitrogen must have a minimum purity of 99.999.

  • Speed: Not necessarily going slower gives better results. Many times, as the cutting speed decreases, the temperature induced to the groove increases, causing vapors that disturb the flow of the gas, and does not allow the waste to be extracted, which will adhere to the part.
  • Gas piping system: make sure that the cylinders are as close as possible to the machine so that we do not lose pressure.
  • The environment: The gas reacts differently depending on the environmental conditions. Temperature, humidity, and especially changes can affect cutting quality.
  • Focal length: Depending on the material to be cut, the focal length may be 0 (laser focus on the surface of the material). It can be negative (below the surface). Or positive (focus above the surface of the material). 

We leave you now with a video of one of the metal laser cutting machines of the HSG range cutting a stainless steel sheet in the shape of Barcelona's silhouette, to rest your eyes a little after all this information!

For more information, you can contact our technical department, which will give you more details about the range of metal laser cutting machines.

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