In this blog we will go deeper into the difference fiber laser and CO2 laser for the laser engraving of metals. Because we regularly get the question with which laser you can engrave or mark metals? In principle, this is only with a fiber laser. It has a wavelength that is 10 times smaller than the CO2 and is therefore suitable for engraving most metals. Aluminum, steel, stainless steel, titanium, gold, silver, brass and other alloys that consist of these materials can be laser-etched directly with a fiber.
However, if you treat the metals you can to a certain extent “laser” a metal with a CO2 laser. The metal itself will not actually change color or structure, but the applied surface layer can be removed. Examples of this are lacquered and anodised materials. Aluminum is available in many anodized colors. It is possible to remove the anodizing layer, but the released aluminum will not become shiny but dull gray.
The photos clearly show the result of engraving with a fiber laser or with a CO2 laser. The CO2 can make a clear anodising layer a bit dark, but not much, but paint or anodizing layers can be removed well. A fiber laser can provide finer details (higher resolution), making lines thinner and it is also possible to apply data matrix and QR codes. A fiber laser is also faster. For this example, the fiber laser takes about 80 seconds while the CO2 laser takes about 20 minutes.
In short, you can not engrave metal with CO2, but you can remove surface layers of metals. If the details have to be small and time for the marking is critical, then MetaQuip recommends testing a fiber laser. MetaQuip offers fiber lasers as stand-alone machines but also customer-specific solutions, from source to complete mechanization. We look with you for a suitable machine that fits your problem, for us the challenge and for you a solution.
Difference fiber laser and CO2 laser on painted aluminum
Difference fiber laser and CO2 laser on bright aluminum - result CO2 laser
Difference fiber laser and CO2 laser on bright aluminum - fiber laser result