By joining metal and plastic, we combine the advantages of two completely different materials. For such joints, it is necessary to ensure adequate bonding strength, which is why laser microstructuring of metal parts has recently been intensively researched. This process increases the contact surface area between the two materials and aims to achieve a self-locking joining mechanism on the microscale.
The thesis presents an experimental analysis of the influence of various laser parameters on the processed surface. By adjusting pulse duration, frequency, scanning speed, and the number of passes, sample matrices of laser-treated surfaces were produced.
The analysis showed a good correlation between total depth and burr height, as well as between the outer and inner width of the laser groove. Increasing the scanning speed has a distinctly negative effect on the total depth. Increasing the number of passes may cause surface damage to the material. Good results were generally obtained at lower speeds and with a single pass. Two measurements stand out. In the measurement with a laser pulse duration of 100 ns, one pass at a speed of 200 mm/s, and frequencies ranging from 60 to 140 kHz, we achieved an average total depth of 50 μm, an average inner width of 38 μm, and an average burr height of 18 μm. In the measurement with a laser pulse duration of 350 ns, a frequency of 30 kHz, a scanning speed of 400 mm/s, and a number of passes from one to five, we achieved an average total depth of 59 μm, an average inner width of 45 μm, and an average burr height of 19 μm.
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