Laser engraving of metal involves using a laser to melt or burn a metal surface to create grooves and patterns. For the laser to work effectively, the surface must be clean, smooth, and able to absorb the laser energy. Here are the key steps to prepare a metal surface for laser engraving.
The first step is to clean the metal thoroughly, removing any dirt, oil, grease, or other contaminants from the metal. Apply the cleaner with a lint-free cloth and wipe away any debris. For some stubborn dirt or grease, scrub the metal surface with an abrasive pad, then rinse and dry the metal thoroughly.
Any scratches, dents, or imperfections on the metal surface will affect the effect of the laser engraved material. You can lightly sand the metal with fine sandpaper to create an even and smooth surface. Then wipe off the dust with a tacky cloth.
Application of laser engraved coating layers
For metals with high reflectivity, such as stainless steel, spraying a laser engraving coating helps improve engraving results. The coating creates a matte black finish on the surface of the metal, which absorbs more laser energy than the surface of the metal in its normal state. If desired, you can also remove the coating with acetone after engraving.
With proper surface treatment, such as cleaning, sanding, spray coating, etc., you can obtain high-quality laser engraving effects on metal.