Laser processing is increasingly being established as a key technology in modern industry due to its high precision, repeatability, and potential for automation. Fiber lasers, because of their robustness and flexibility, are being used more frequently, particularly in remote laser processing. In this study, a robot-controlled system with a 400 W fiber laser and a scanning head with a feed rate of 30 m/s was employed. The influence of laser power and feed rate on the shape and microstructure of the processed surfaces was analyzed, with particular emphasis on the transitions between the regimes of cleaning, remelting, marking, evaporation, and the associated engraving. The results showed that by adjusting the process parameters, it is possible to quickly switch between different processing regimes without the need to change equipment. It was found that the material response is strongly influenced by its physical properties, with reflectivity and thermal conductivity identified as the most significant factors, which was especially pronounced in the case of copper. Multiple passes at higher feed rates yielded results comparable to single passes at lower feed rates.
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