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[Laser Selection according to Material] Metal

This section introduces the optimal laser wavelengths for a variety of materials.


Aluminium

Charcoal Gray Marking for Good Visibility

Suitable Models

3-Axis Hybrid Laser Marker MD-X1000/1500 series

Print Quality
  • - Charcoal gray marking on aluminum surfaces.
  • - High power is used to mark the target with coloration.
Technique
  • - Aluminum has a higher reflectance than iron or stainless steel, so select a laser with a high peak power.
  • - Perform powerful marking at the position where the laser beam is focused with a small beam spot diameter and high energy density.

Marking example

White Contrast Marking

Suitable Models

3-Axis Hybrid Laser Marker MD-X1000/1500 series

Print Quality
  • - Lightly engrave the aluminum surface for a white finish.
Technique
  • - Specify a high power and a fast scan speed. White marking on aluminum can be performed stably and over a wide condition range.
  • - YAG laser markers are commonly used to mark thick characters. YVO4 laser markers are commonly used to mark thin characters.

Marking example


Stainless steel

ANNEALED MARKING ON STAINLESS STEEL

Suitable Models

MD-F3100/5100 Series 3-Axis Fiber Laser Marker
MD-V9900 Series 3-Axis YVO4 Laser Marker

Print Quality
  • - Clear black printing by surface annealing through purposeful laser defocusing.
  • - Printing without causing damage to fi ne metal components, with less than 1 μm surface variation.
Points to Note
  • - By de-focusing the laser, energy density is decreased and black printing can be achieved without damaging the surface of the material.
  • - In some cases, fi ne tuning the pulse frequency (Q-switch) of the laser is needed to minimize damage to the surface of the target.
Benefits of 3-Axis Lasers
  • - The variable focal distance of the MD-F allows for uniform printing on complex shapes, even when purposely de-focusing the laser.
  • - Distortion free printing is achievable on any shape of target with 3-axis control.

ENGRAVED MARKING ON STEEL

Suitable Models

MD-F3100/5100 Series 3-Axis Fiber Laser Marker
MD-V9900 Series 3-Axis YVO4 Laser Marker

Print Quality
  • - Engraved printing on the surface without discoloration.
  • - Deeper marking can be achieved by overlapping characters.
Points to Note
  • - In some cases, a deeper mark can be achieved by overlapping marks that print more quickly rather than one mark that slowly engraves the surface.
  • - Engraving is made easier by setting the Q-switch frequency low, therefore releasing more energy per pulse.
Benefits of 3-Axis Lasers
  • - Large-sized nameplates can be printed with uniform depth.
  • - Distortion free engraving is achievable in a 300 mm x 300 mm area.


Cemented Carbide

Suitable Models

3-Axis Hybrid Laser Marker MD-X1000/1500 series
3-Axis Fiber Laser Marker MD-F3100/5100 series

Print Quality
  • - Black-annealed marking is possible, the same as with iron and stainless steel.
Points to Note
  • - It is especially disadvantageous for cemented carbide tools to be cracked, so a key point is the fine adjustment of the Q-switch frequency.
  • - Depending on the type of cemented carbide, characters may not be marked in black. Instead, they may be marked in white, similar to polishing the surface.
  • - Fiber lasers are optimal when processing time is important. YVO4 lasers are optimal when quality is more important (preventing damage).
Benefits of 3-Axis Lasers
  • - Even on curved surfaces such as drills, it's possible to mark clearly with no distortion.
  • - The focal point can be varied even when using the laser offline, so there is no need to perform adjustments, which supports marking on a wide variety of products.

Black-annealed marking on a cemented carbide tool


Copper

Suitable Models

3-Axis Hybrid Laser Marker MD-X1000/1500 series
Telecentric Green Laser Marker MD-T1000 series

Print Quality
  • - The surface is marked by shallow engraving.
  • - The marked surface becomes whitish.
Points to Note
  • - With a CO2 laser marker, the majority of the laser light is reflected, so it is not possible to perform marking.
  • - Because the reflectance is high, select a laser marker with a high peak power.
  • - It is possible to perform black, carbonized marking with the fundamental wavelength, but this takes time due to the low absorption coefficient.
Benefits of 3-Axis Lasers
  • - Due to the uniform spot across the whole area, faint characters do not occur even for workpieces with high reflectance.
  • - The high peak power enables clear marking on copper.

3-Axis Hybrid Laser Marker MD-X1000/1500 series Telecentric Green Laser Marker MD-T1000 series

2D code marking on a lead frame (copper)


GOLD PLATING

Suitable Models

MD-V9900 Series 3-Axis YVO4 Laser Marker

Print Quality
  • - Engraving as well as light and dark contrast marks are achievable on gold surfaces.
Points to Note
  • - Fine tuning of the pulse frequency (Q-switch) is fundamental due to the high refl ective properties of gold.
  • - Thick plating may require added adjustment of marking variables in order to achieve the desired type of mark.
Benefits of 3-Axis Lasers
  • - Clear printing is achievable, even on curved surfaces with a small diameter.
  • - Precise focal point adjustment allows for uniform marking on highly refl ective targets.

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