Several reasons for uneven marking effect of fiber laser marking machine!

Laser processing is a new type of non-contact processing, chemical pollution-free, and wear-free new marking processing mode. However, there are sometimes some common problems in the application of laser marking machines, such as uneven marking effect of laser marking machines. The following is an analysis of the reasons why the fiber laser marking machine has uneven marking effect:

1.Thermal lens phenomenon When the laser passes through the optical lens (refraction, reflection), it will cause the lens to heat up and produce slight deformation. This deformation will increase the focus of the laser and shorten the focal length. If the machine is fixed and the distance is adjusted to the focus, after the laser is turned on for a period of time, the laser energy density acting on the material will change due to the thermal lens phenomenon, resulting in uneven marking effect.

2. The machine level is not adjusted properly, that is, the laser galvanometer lens or field lens is not parallel to the processing table.

Because the two are not level, the distance from the laser beam to the processing object after passing through the field lens will be inconsistent, and the energy of the laser falling on the processing object will have inconsistent energy density, which will show uneven effects on the material.

3. Material reasons, such as inconsistent film thickness on the surface of the material or changes in physical and chemical properties

The material is sensitive to laser energy. Usually, under the same material, the laser energy reaches the material damage threshold. When the material coating thickness is different, or some other physical and chemical treatment processes are not uniform, it will also cause uneven effects after laser marking.