Metal marking with a CO2 laser
Plain metal can only be marked with a CO2 laser engraving machine if you use a marking solution as well. It needs to be applied to the workpiece before laser processing begins. It needs to dry completely as well, as it is then burned into the material during the laser process. Once it has finished, the excess marking paste must be washed off. (In our example, we used stainless steel)
A laser marking spray is also essential when cleaning sensitive or expensive materials, such as watch markings. It is worth noting that marking solutions are classified as hazardous materials, so always make sure you are being safe! Protect yourself and your employees!
Without a marking solution, the CO2 laser source, with a wavelength of 10.6µm, is not really suitable for metal marking. A much higher laser power is required for metal to react. The process must be very slow as well, resulting in the material being subjected to a very high level of energy, which can potentially deform or ruin your product if not done correctly.