When laser cutting and processing sheet metal parts, a large amount of heat will be generated, and the heat is not diffused in time, resulting in edge burning. During the processing of small holes by metal laser cutting machine, the outer side of the hole can be cooled, while the small hole part inside the single hole is too concentrated due to the small space where the heat can be diffused, resulting in over-burning and slag hanging.

In addition, in the process of thick plate cutting, the molten metal accumulated on the material surface and the heat accumulation generated during the perforation will cause the auxiliary air flow to be disordered and the heat input to be too much, which will lead to overburning and cause the phenomenon of edge burning.

So how to solve the problem of edge burning and slagging?

The solution to overburning during laser cutting of carbon steel holes: in carbon steel cutting with oxygen as auxiliary gas, the key to solving the problem is how to suppress the generation of oxidation reaction heat. The method of auxiliary oxygen during perforation and lagging switch to auxiliary air or nitrogen for cutting can be adopted. This method can process small holes with an upper limit of 1/6 thick plate.

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

Solution for laser cutting of aluminum alloy and stainless steel: in the processing of such materials, the auxiliary gas used is nitrogen, and burning will not occur in the cutting. However, due to the high temperature of the material inside the small hole, slagging on the inside will be more frequent.

The solution to this problem is to increase the pressure of auxiliary gas, and set the condition as pulse condition with high peak output and low frequency. When the auxiliary gas is used with air, as with nitrogen, it will not burn, but it is easy to have slags at the bottom. The conditions need to be set to pulse conditions with high auxiliary gas pressure, high peak output and low frequency.

About HGTECH: HGTECH is the pioneer and leader of laser industrial application in China, and the authoritative provider of global laser processing solutions. We have comprehensively arranged laser intelligent machine, measurement and automation production lines, and smart factory construction to provide overall solutions for intelligent manufacturing.