Influence of power density and frequency of the process of laser marking of steel products

The study is about the process of laser marking by melting products made of carbon structural steel 15Cr2 with wide application in industry. A fibre laser operating in the near-infrared region was used to perform the experiments. A raster marking method was used by varying the power density of the laser radiation and the frequency of pulses repetition. For each marked area, the contrast is determined by measuring the saturation of the marked area and the background by the greyscale. Graphs of the dependence of the contrast on the power density for three marking speeds and on the contrast on the frequency for two marking speeds are analysed. The work intervals for the power density and frequency for this steel and fibre laser, are determined.