Cooling system problems:

Cooling air or cooling water is not turned on or does not meet the requirements. During laser cutting, the nozzle needs to be cooled enough to prevent overheating.

When cutting thick plates, if the nozzle cooler is not opened or the cooling effect is not good, it will also cause the nozzle to heat up.

Laser path problem:

The laser focusing path may be shifted, causing part of the laser to shine on the nozzle, which causes the nozzle to overheat.

The laser optical path is not coaxial, which may also cause the laser beam to deviate from the predetermined path, indirectly affecting the nozzle temperature.

Nozzle and lens contamination or blockage:

The nozzle aperture is partially blocked or polluted, which will affect the cooling effect and the transmission of the laser beam, resulting in the nozzle heating.

If the protective lens (upper protection, medium protection lens) is polluted by oil, water and dust, it will cause light path refraction, and some laser may hit the nozzle.

Improper setting of operating parameters:

The cutting focus is set too high, which may cause the laser beam to diverge before reaching the workpiece, and part of the energy directly acts on the nozzle.

Poorly set perforation parameters may also lead to nozzle blockage or overheating.

Workpiece and material factors:

The workpiece layout is too dense, and when the plate overheats, it affects the ambient temperature, including the temperature near the nozzle.

When cutting some materials (such as carbon steel), the material oxidizes during the cutting process, generating a lot of heat, and may also indirectly cause the nozzle to heat.

Nozzle material problem:

Improper material selection or poor quality of the nozzle may not be able to withstand high temperature or high pressure working environments, resulting in heating.