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5 reasons for uneven laser marking effect

by:Leadtech Coding     2021-10-28

Nowadays, fiber laser marking machines are used in all major industries, and it can be applied in a wide range of industries.

However, when using a fiber laser marking machine, the marking effect may be uneven. What is the cause of this?

First of all, use deviation to mark the content of a specific range

Because each focusing lens has a corresponding focus depth range, and the method of defocusing will easily lead to a large range The mark pattern, so the edge is at the critical depth of the focus depth or exceeds the focus depth, which is more likely to cause unevenness of the effect.

Therefore, the method of off-focus marking needs to consider the issue of laser energy.

Secondly, the laser output spot is blocked, that is, the laser beam passes through the galvanometer and field lens, and the spot is missing.

Because the laser output head, fixing fixture, and galvanometer are not adjusted, some spots will be blocked when the laser passes through the galvanometer.

After being focused by the field lens, the light spot on the frequency doubler is non-circular, which may cause uneven effects.

There is still such a situation: that is, the galvanometer deflecting lens is damaged, and when the laser beam passes through the damaged area of u200bu200bthe lens, it cannot be reflected out well.

Therefore, the laser energy in the damaged area of u200bu200bthe laser beam and the lens is inconsistent with the undamaged area of u200bu200bthe lens, and the laser energy acting on the material is also different, which makes the marking effect uneven.

Third, thermal lens phenomenon

When the laser passes through the optical lens (refraction, reflection), the lens will generate heat and slightly deform.

This deformation causes the laser focus to rise and the focal length to become shorter.

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 effects.

Fourth, the machine level is not adjusted properly, that is, the laser vibrator lens or the field lens is not parallel to the processing table

Because the two are not horizontal, so The length of the laser beam passing through the field lens and reaching the workpiece is not uniform.

The laser energy falling on the workpiece will have an inconsistent energy density and will show uneven effects on the material.

Fifth, the reasons for the material, such as inconsistent film thickness or inconsistent physical and chemical properties of the material surface

The material is very sensitive to laser energy.

Usually, under the same material, it is certain that the laser energy reaches the material damage threshold.

When the thickness of the material coating is different, or some other physical and chemical treatment processes are not uniform enough, the effect after laser marking will also be uneven.

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