Industry Solutions

Best Solution for Cutting Copper and Brass

Author: Penta Laser Release time: 2020-06-18 Views: 840

Best Solution for Cutting Copper and Brass

Copper, brass, bronze, silver, and gold are highly reflective of infrared light in their solid state.Their low absorption of infrared laser light makes these metals challenging to cut. Laser cutting of mild steel and stainless steel has a long history and has been one of the primary applications for CO2 lasers. However CO2 lasers have not traditionally offered a good solution for cutting highly reflective materials.

Fiber lasers have an emission wavelength of around 1.07 µm, compared to 10.6 µm for traditional CO2 alternatives. Not only is the 1.07 µm laser light reflected less, and therefore absorbed more easily, but the shorter wavelength can be focused into a spot that is around 1/10th of the diameter of a CO2 beam. This provides a dramatically higher power density, making metal penetration easier. At such high power density levels, metals such as copper and brass quickly go through a phase change into molten state, therefore the laser beam rapidly overcomes the reflectivity barrier of such metals to initiate an efficient cutting process.

Small focus spots and extremely high power density (more than 100 MW/cm2) is made possible by:
Relatively short wavelength
High beam quality
Economical availability of high peak power fiber lasers
 

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