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Laser Cleaning

Author:editor Time:2024-04-16 Hits:

Laser cleaning 

Clean,  homogeneous surfaces - this is the basic prerequisite for successful  and durable welding and bonding. But before joining, parts are often  contaminated, oxidized or equipped with protective layers. This is where  lasers come in: non-contact molds remove contamination, oxidation and  functional layers within seconds. However, this is only possible, for  example, if the functional layer is to be connected or is no longer  required. The principle of operation is as follows: Pulses with high  peak pulse power vaporize extremely thin layers without affecting the  part. Subsequent processes, such as joining, run more uniformly, faster  and are completely reproducible. The joining is clean and the effect is  longer lasting. In addition, the laser-assisted joining preparation can  be seamlessly integrated into industrial series production, as data can  be easily transferred via the interface.


Advantages of laser cleaning 

Very gentle on materials 

In  alternatives to laser cleaning (e.g. sandblasting), the surface of the  part may be damaged, whereas the laser can work without contact and  without residue.


Accurate and repeatable 

The laser enables the removal of functional layers in a controlled manner and with micron-level precision - easily repeatable.


Inexpensive and clean 

With  laser cleaning, there is no need for additional jets and cleaners that  have to undergo complex and expensive treatments. The wear layer will be  removed directly by suction.


High processing speed 

Lasers are characterized by high fluence and fast beat times compared to alternative cleaning methods. 


Non-marring 

Working principle of cleaning with lasers 

Overview of laser cleaning applications 

csm_TRUMPF-process-scheme-laser-cleaning-EN_1d3653f57c.jpg

To clean surfaces by means of lasers, laser marking machines and short-pulse or ultrashort-pulse lasers can be used.

The working principle always remains the same: 


The  focused laser beam removes impurities as well as oxidized or functional  layers interfering with the joining process, pulse by pulse. 

With very high peak pulse powers, the laser vaporizes unwanted layers contactlessly and extremely gently.

In  contrast to CO2 lasers, which still leave a thin layer (e.g. 5 µm  paint) when cleaning, solid-state lasers can treat surfaces in a more  targeted manner. The surface of the workpiece remains thermally  virtually unaffected by the laser pulse, thus preventing deformation or  material damage and changes.

Worn material can be easily and directly extracted by means of an optional suction system integrated in the respective machine.

Through  targeted laser parameterization, the laser can also texturize part  surfaces, ensure better adhesion at the bond and adapt to friction and  shape for joining, as well as mark parts (e.g., codes for tracking).




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