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Laser rust removal is to use the high energy and high concentration of the laser to irradiate the workpiece to be processed, so that the substrate surface attachments (dirt, oxide scale, rust, organic coating, etc.) absorb the laser energy, melt, vaporize and volatilize , A rust removal method that makes the oil stains, rust spots or coatings on the surface evaporate or peel off instantly, so as to achieve the purpose of purifying the surface of the substrate. Does not damage the substrate.