How Does a Laser Marking Machine Work? Guide to Industrial Laser Marking Technology
Laser marking machines are industrial production technologies used to create permanent marks on the surface of materials such as metal, plastic, glass, and ceramic. These machines use high-intensity laser beams to create microscopic changes on the material surface. Processes such as serial numbers, QR codes, DataMatrix, logos, and technical labeling can be carried out quickly and permanently with laser marking technology.
Basic Principle of Laser Marking Technology
What is laser marking?
Laser marking is the process in which a high-energy laser beam is focused onto a surface to create a controlled change in the physical or chemical structure of the material. This change creates contrast on the surface and enables a permanent mark to be obtained.
How is the laser beam generated?
In laser marking machines, the laser source generates concentrated energy at a specific wavelength. This energy is focused onto a very small point through optical systems.
Laser marking process
The marking process consists of three basic steps: energy generation, directing the laser beam, and marking on the surface.
What is a galvo system?
The galvo system consists of optical mirrors that enable the laser beam to move quickly across the surface. This system allows high-speed marking.
How is laser focusing performed?
The laser beam is directed to a very small focal point with special lenses. At this point, the energy density increases and the marking process takes place.
Interaction between laser and material
When the laser beam comes into contact with the material, it can create heat or a photochemical reaction. This causes color change or engraving on the surface.
Types of marking
- Surface contrast marking
- Deep engraving
- Oxidation marking
- Coating removal
Laser marking in industrial production
In the automotive, electronics, medical, and aerospace industries, laser marking is used for part traceability.
Why is laser marking permanent?
Because the laser process physically changes the material surface, the marks are generally not removable.
Advantages of laser marking machines
- Does not require consumables
- Operates at high speed
- Creates permanent marks
- Can be integrated with automation systems
Industrial Use of Laser Marking Systems
On which materials can laser marking be performed?
Laser marking can be performed on metal, plastic, glass, ceramic, and some organic materials.
Fiber laser technology
Fiber laser systems offer especially high performance on metal surfaces.
CO2 laser technology
CO2 laser systems are used on plastic, wood, and packaging materials.
UV laser technology
UV laser systems are suitable for sensitive plastics and electronic components.
In-line laser marking
In production lines, laser systems can work integrated with PLC.
Automation integration
Modern laser marking systems can exchange data with MES and ERP software.
DataMatrix and QR code marking
2D code marking is widely used for part tracking in industrial production.
Camera verification systems
The readability of codes after marking can be checked with a camera system.
Laser marking safety
Industrial laser systems should be designed in compliance with CE and laser safety standards.
How is the right laser marking system selected?
Criteria such as material type, production speed, and marking depth are important in selecting the right system.
Is laser marking permanent?
Yes, laser marking is generally permanent.
Can laser marking be done on metal?
Yes, fiber laser systems are suitable for metal.
Is laser marking possible on plastic surfaces?
Yes, it can be done by using the appropriate laser type.
Is laser marking fast?
Yes, marking can be done within seconds.
What is the cost of laser marking?
Since there are no consumables, it is economical in the long term.
Can it be used in in-line production?
Yes, it can be integrated with automation systems.
Can a QR code be made with laser?
Yes, a QR code can be created with laser marking.
Is deep engraving possible?
Yes, it can be done with high-power lasers.
Is laser marking safe?
It is safe with appropriate safety measures.
Are sample tests necessary?
Yes, they are recommended to determine the best parameter.
