Tips for avoiding over-burning when laser cutting sheet metal from Gerald Bell's blog

1. Include a cooling point or make use of the ring-cutting feature.
When cutting plates with sharp corners in sheet metal processing, the location where overburning is most likely to occur is frequently at the sharp corners of the plates being worked. Overburning will result in the sharp corners being cut into circular shapes. A cooling point can be added at this point to the sharp corners if necessary. Stopping at the sharp corners and blowing air can help to prevent overburning and other problems. Instead, the circular cutting function can be used to avoid the overburning phenomenon that can occur when there is too much heat generated by slow speed at a sharp corner, as described above.

2. The use of high-powered lasers
In the case of carbon steel, a higher power laser can be used for cutting. The bright surface cutting process can effectively prevent overburning, and the finished product can be cut without burrs and with a bright cutting surface thanks to the bright surface cutting process. Overburning can be prevented to a significant extent by using high power.

3. Nitrogen cutting is used.
When cutting sheet metal with oxygen as an auxiliary gas, it is possible to switch to nitrogen for cutting. By using laser energy to melt the materials, nitrogen cutting can be performed without the material reacting with the sheet metal forming. Because the temperature in the melting point area is relatively low, and because nitrogen is used to cool and protect the reaction, the reaction is stable and uniform, and the cutting quality is excellent in this area. A fine and smooth section, low surface roughness, and the absence of an oxide layer are all characteristics of the section.

4. Increase the amount of air pressure in the room
If you are using a laser cutting machine to process aluminum alloy and stainless steel, the auxiliary gas that is used is nitrogen or air, which means that there will be no edge burning when you are cutting. But because of the high temperature of the material contained within a small hole, the presence of slag clinging to the inside wall will become more frequent. In this case, increasing the pressure of the auxiliary gas can help to reduce the amount of burr and slag hanging.