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Deep laser marking on metals is made through a deep penetration process in the component we are processing. The result is very similar to mechanical engraving. However, in this case, the material is removed layer by layer, so as to create corner radii of a few millimetres, which wouldn’t be possible to make with mechanical methods. Moreover, the laser can mark special materials that are difficult to process.
Annealing occurs when the marking oxidises the surface of ferrous metals (iron, steel, stainless steel) and titanium 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 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.
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