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Abstract
The laser marking process by melting samples of C110W carbon tool steel was studied. The experiments were performed with a fiber laser and a CuBr laser. A field of squares is marked in a raster method for different values of the overlap coefficient and power density. The contrast of the marking is determined on each marked square. From the obtained experimental data, graphs of the dependence of the contrast on the overlap coefficient for three power densities were drawn. The obtained results for the two lasers are compared and the influence of the wavelength is indirectly analysed. The working intervals of the overlap coefficient for the studied power densities for the two lasers at which the optimal contrast in the processing zone is obtained are determined.
Highlights
Laser marking is a modern technology that is increasingly used in modern production in electronics, electrical engineering, mechanical engineering, medicine, and others
The wide penetration of laser marking technology in industrial production is primarily due to its special characteristics, such as non-contact during the process, which allows processing both ultra-hard materials for mechanical engineering and brittle and thin materials for microelectronics
The overlap coefficient kov of the laser radiation pulses is a complex factor that gives a relationship between the marking speed on the one hand and the frequency of pulse repetition and laser power density through the diameter of the working spot on the other hand
Summary
Laser marking is a modern technology that is increasingly used in modern production in electronics, electrical engineering, mechanical engineering, medicine, and others. The present study focuses on the analysis and the relationship between two technological factors, the overlap coefficient and the scan overlap coefficient, on the quality of the marking and in particular on the contrast in the processing area. Their influence has a direct impact on the linear density of the pulses entering at the processing area, as well as on the linear energy density and the effective energy for the realization of the specific technological process
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