![]() This results in a colored mark on the surface of the workpiece without removing the material and is often known as "Color laser marking". The surface of the metal undergoes melting and solidification, which creates an oxide layer over the surface and changes the microstructure of the surface. In this method, there is no removal of the material, which makes it ideal for working with thin surfaces, where maintaining the strength of the workpiece is the main priority.Ī high-power laser is used to heat the surface of the metal and oxidize it without vaporizing the material. The melting and solidification method solves the problem of engraving thin surfaces with varying brightness without damaging or weakening the workpiece. Removing a lot of material renders the part weak and can cause warping when working with thin surfaces.ĭue to this reason, the overlapping method of color engraving is not suitable for engraving thin surfaces. However, as the number of passes increases, material removal also increases. The ability to regulate the number of passes over a point to create a mark with varying brightness makes this method ideal for engraving complex patterns. In this method, the laser head moves over a particular point repeatedly to create a bright color mark on the surface of the metal. The overlapping method of color engraving produces a vivid engraving with good contrast. This method is generally applied for engraving simple geometric shapes such as circles, squares, rings, triangles, etc. In this method, the laser head follows a continuous path that does not intersect or overlap at any point in the engraving.ĭuring this type of engraving, constant laser power and spot size are maintained throughout the engraving to attain a uniform engraving pattern.Īs a result, the engraving produced by this method has uniform brightness and contrast, which makes it unsuitable for complex engravings that require greater depth of contrast.
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