Laser has its best effects on metal on which it’s easier to achieved diversified results.
Fiber sources are the best and most innovative laser technology for laser marking metal. They’re ideal for precision laser marking, micro-processing and cutting any metal or alloy and painted metals with surface treatments (e.g. anodized aluminum).
They can be used in both standard and MOPA (i.e. with variable pulse) versions. The latter is particularly effective in terms of versatility and quality.
There are various processes that can be applied to metals, including surface laser marking, deep laser engraving, and annealing
This process allows markings that are only a few millimeters deep. Compared to laser engraving, less energy converges to the laser beam. This process is faster since it does not need to dig deep. Once in contact with the material, the laser marking melts it at the surface, thus modifying its roughness.
Unlike marking, which creates grooves, laser engraving makes the material evaporate in a few milliseconds, creating permanent markings. Moreover, engraving is more resistant. Therefore, it is particularly recommended when the laser marking suffers post-process stress (such as sandblasting for die-castings).
Annealing occurs when the marking oxidizes the surface of metals, heating them locally. Usually, the oxide layer is black, but it can have different shades, depending on the temperature of the heated layer. During the darkening process, the material’s surface is kept uniform because marking does not entail the removal of material, but just its heating. Heat reaches a depth ranging between 20 and 30 µm.