Unveiling laser percussion drilling in metals with ultrashort pulses: insights from high-speed synchrotron x-ray imaging on microhole formation and side channel phenomena

Manuel Henn; Lukas Schneller; Daniel Holder; Dennis Haasler; Marc Hummel; Felix Beckmann; Julian Moosmann; Christian Hagenlocher; Thomas Graf

doi:10.1117/12.3003661

12 March 2024 Unveiling laser percussion drilling in metals with ultrashort pulses: insights from high-speed synchrotron x-ray imaging on microhole formation and side channel phenomena

Manuel Henn, Lukas Schneller, Daniel Holder, Dennis Haasler, Marc Hummel, Felix Beckmann, Julian Moosmann, Christian Hagenlocher, Thomas Graf

Author Affiliations +

Proceedings Volume 12873, Laser-based Micro- and Nanoprocessing XVIII; 1287309 (2024) https://doi.org/10.1117/12.3003661
Event: SPIE LASE, 2024, San Francisco, California, United States

Abstract

The comprehension of microhole formation during percussion drilling of metals using ultrashort laser pulses is still limited. The shape of a microhole can be impacted by factors like heat accumulation, the emergence of side channels, bending, and bulging. Understanding these defects is challenging due to constraints in conventional diagnostics. To address this issue, high-speed synchrotron x-ray imaging was employed to capture the spatial and temporal evolution of the microhole shape during laser percussion drilling of stainless steel. The recorded images reveal that heat accumulation leads to the creation of a melt film on the microhole walls, exhibiting dynamic fluctuations throughout the drilling process. Furthermore, a transversal widening or bulging of the microhole can be seen later in the process. Additionally, the emergence of side channels was observed in the region of maximum drilling depth, where the overall fluence on the microhole walls falls below the threshold fluence.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Manuel Henn, Lukas Schneller, Daniel Holder, Dennis Haasler, Marc Hummel, Felix Beckmann, Julian Moosmann, Christian Hagenlocher, and Thomas Graf "Unveiling laser percussion drilling in metals with ultrashort pulses: insights from high-speed synchrotron x-ray imaging on microhole formation and side channel phenomena", Proc. SPIE 12873, Laser-based Micro- and Nanoprocessing XVIII, 1287309 (12 March 2024); https://doi.org/10.1117/12.3003661

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