Fiber laser cutting machine is a high-precision processing equipment with fiber laser generator as the core, which can accurately cut metal sheets such as aluminum, aluminum alloy, brass, etc.



 

* Aluminum and aluminum alloys

1. Cutting process: 

When the thickness of aluminum alloy is less than 6mm, high-purity and high-pressure nitrogen gas is usually used as an auxiliary gas to obtain a clean cut. For thick plates (6mm or more), oxygen is sometimes used for cutting. When oxygen cuts aluminum, an exothermic reaction occurs, which helps to improve cutting ability, but the incision becomes rough, blackened, and forms an aluminum oxide layer.  


2. Aluminum is a highly reflective metal that poses a challenge for fiber laser cutting machines:

   High reflectivity: Aluminum has a high wavelength reflectivity for fiber lasers, which means that a large amount of laser energy will be reflected instead of absorbed for cutting. This poses a challenge to the output stability and protective lens of the laser.
 

   High thermal conductivity: Heat will quickly dissipate from the cutting area, requiring higher power density to initiate and maintain the cutting process.
 

   Low melting point and high viscosity: The molten aluminum liquid has a high viscosity and is not easily blown away, which can easily form slag on the back.

3. Cutting quality:

With good equipment performance and optimized parameters, relatively smooth sections can be cut, but it is difficult to completely avoid slag hanging and usually requires subsequent processing.



 

* Brass

The cutting difficulty of brass is similar to or even higher than that of aluminum.

1. Cutting process:

Nitrogen must be used as an auxiliary gas to prevent oxidation and more complex chemical reactions.


2. Features and Challenges:
 

   Extremely high reflectivity: Brass has a higher reflectivity for fiber lasers than aluminum, posing a greater threat to lasers. Modern high-end lasers are usually equipped with an "anti reflection" function to cope.
 

   High thermal conductivity: Heat will quickly dissipate from the cutting area, requiring higher power density to initiate and maintain the cutting process, similar to aluminum.
 

   The influence of zinc element: Zinc in brass has a low boiling point (about 900 ° C) and is prone to evaporation at high temperatures during laser cutting, resulting in the production of more smoke and zinc vapor above the cutting surface, which affects the cutting quality and environment.