5 Reasons That Why Burrs Appear During Laser Cutting

When laser cutting and processing some metal sheets, burrs are prone to occur, which can affect the accuracy of the processed workpiece and the smoothness of the material surface, and even reduce product quality, causing inconvenience to subsequent acceptance work. What exactly causes laser cutting to produce burrs? How to solve it?

The deviation of the laser beam focal point generated by the laser cutting machine results in energy not only being concentrated on the workpiece, but also incomplete vaporization of the workpiece, which increases the amount of slag and makes it difficult to blow out, making it more prone to burrs.

Solution: Adjust the position of the laser beam focus and adjust it to the normal state according to its offset position.

The output power of the laser cutting machine is insufficient to effectively vaporize the metal, resulting in excessive slag and burrs.

Solution: Check if the laser cutting machine is working properly. If there is any abnormality, it needs to be repaired and maintained in a timely manner. If normal, check if the output value is correct.

The cutting line speed of the laser cutting machine is too slow, which damages the surface quality of the cutting surface and produces burrs.

Solution: Adjust and increase the cutting line speed in a timely manner to reach the normal value.

Insufficient auxiliary gas pressure and low gas purity of the laser cutting machine can cause insufficient slag blowing force, resulting in poor slag discharge and burrs on the workpiece. In laser cutting, the role of auxiliary gas is to blow out the slag in the cutting groove on the surface of the workpiece. Therefore, the gas pressure should be sufficient and appropriate. When the pressure is too low, it is easy to cause adhesion due to incomplete blowing, and when the pressure is too high, it can cause melting and larger cross-sectional patterns. When the auxiliary gas is impure, it will cause a decrease in the operating speed of the laser head on the surface of the workpiece, that is, the auxiliary gas cannot produce sufficient chemical reaction with the workpiece material 100%, resulting in a slower cutting rate, rough cuts, and even inability to cut through.

Solution : The pressure setting is related to the substrate, and the appropriate pressure can be found through sample testing.

For example, the optimal pressure for cutting carbon steel plates with oxygen (auxiliary gas) (for reference only)

When the thickness of medium thick carbon steel plates increases from 6mm to 10mm, the corresponding pressure range of auxiliary gas - oxygen (for reference only):

Cutting pressure when nitrogen (auxiliary gas) cuts stainless steel plate (thickness increased from 1mm to 6mm)

The laser cutting machine works for too long, which makes the equipment unstable and can also lead to the generation of burrs.

Solution: Turn off the laser cutting machine, restart and move it after a period of time to give it sufficient rest.