Why does the cutting edge turn black when processing with high-power fiber laser cutting machine?

Laser cutting and processing of sheet metal parts will generate a large amount of heat. Under normal circumstances, the high heat generated by cutting will diffuse into the slits of the sheet metal being processed.

However, if the heat is not diffused in time and the heat is not cooled down in time, edge burning will occur. During the cutting process of the fiber laser cutting machine, due to the small space for heat diffusion in the workpiece, the heat is too concentrated, causing overburning, slag hanging, etc.

In addition, in thick plate cutting, the cutting speed is relatively slow. The accumulation of molten metal and heat accumulation on the cutting surface of the material produced during the process will cause turbulent auxiliary air flow, excessive heat input, and may also cause burnt edges and blackening. 

Solutions for edge burnt processing with fiber laser cutting machines

1.Adjust cutting parameters: appropriately reduce or increase cutting speed or increase or decrease cutting power to reduce heat accumulation and overburning.

2.Change the auxiliary gas: During the cutting process, you can try to change the auxiliary gas, such as changing from oxygen to nitrogen, to reduce heat generation.

3.Use coolant: Adding coolant to the cutting area can help dissipate heat quickly and prevent overburning.

4.Keep the workbench clean: Make sure the workbench is clean and tidy to avoid dust, impurities, etc. from affecting the cutting effect and causing heat accumulation.

5.Avoid long-term continuous cutting: Long-term continuous cutting will lead to heat accumulation. Intermittent cutting can be used to allow enough time for laser cutting to dissipate heat, which also plays a role in maintaining the service life of the laser.