Causes and treatment methods of edge burning when laser cutting stainless steel

When laser cutting stainless steel sheet metal parts, a lot of heat will be generated. Under normal circumstances, the heat generated by the cutting will be distributed along the slit to the processed sheet metal for sufficient cooling.

When the stainless steel plate is processed by the laser cutting machine, the outer side of the hole can be fully cooled, but the small hole part of the inner side of the single hole has a small space where the heat can be dispersed, and the heat energy is too concentrated, causing overburning, slag and so on. In thick plate cutting, the molten metal accumulated on the surface of the material and the accumulation of heat during perforation will cause disturbance of the auxiliary airflow, excessive heat input, and then cause overburning.

Causes and treatment methods of edge burning when laser cutting stainless steel  Laser Cut Stainless Steel Sheet Metal Parts Fabrication 1

How to deal with burning edge and slag problem

Treatment method for over-burning during laser cutting opening hole cutting: In the cutting with oxygen as the auxiliary gas, the key to solving the problem is how to suppress the occurrence of oxidation reaction heat. The method of assisting oxygen during perforation and switching to assisting air or nitrogen to cut after lag can be used.

Pulse cutting conditions with low frequency and high peak output power have the characteristics of reducing heat output, which helps to optimize cutting conditions. Setting the conditions as a single pulse laser beam, high peak output with high energy intensity, and low frequency conditions can effectively reduce the accumulation of molten metal on the surface of the material during the perforation process and effectively suppress heat output.

Treatment method of laser cutting stainless steel parts: In the processing of such materials, the auxiliary gas used is nitrogen, and there will be no edge burning during cutting. However, because the temperature of the material inside the small hole is very high, a small amount of hanging will appear on the inside. Slag phenomenon. The auxiliary gas used in our company's sheet metal processing is nitrogen, which can achieve the ideal cutting effect.

A useful solution is to increase the pressure of the auxiliary gas and set the conditions to high peak output, low frequency pulse conditions. When nitrogen is used as the auxiliary gas, there will be no over-burning phenomenon, but there will be very little slag at the bottom. The conditions need to be set to high auxiliary gas pressure, high peak output, and low frequency pulse conditions.

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