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12 March 2024 Characterizing the effect of the vapor plume on laser beam characteristics during laser beam welding
Johannes Wahl, Christian Frey, John Powell, Felix Zaiß, Michael Haas, Simon Olschok, Christian Hagenlocher, Uwe Reisgen, Thomas Graf
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Proceedings Volume 12878, High-Power Laser Materials Processing: Applications, Diagnostics, and Systems XIII; 1287809 (2024) https://doi.org/10.1117/12.3002720
Event: SPIE LASE, 2024, San Francisco, California, United States
Abstract
The keyhole produced during deep penetration laser welding emits a plume of hot metal vapor and particles. The interaction between the plume and the incident laser beam results in beam scattering, absorption, and phase front deformation. The combination of scattering and absorption leads to a partial extinction of the laser beam, while the phase front deformation adversely effects the beam quality. In this study we present a measurement setup which allows for diagnostics of the beam characteristics after interaction with the plume. This is achieved by utilizing an additional measurement beam, which is coaxially aligned to the high-power laser beam used for welding. The experimental procedure presented here enables high-frequency measurements of the caustic changes and relative power losses of the measurement beam. The measurements obtained provide a quantification of the various interaction mechanisms between the laser beam and vapor plume. This knowledge is crucial to prevent weld defects, which result from the adverse effects of the vapor plume on the laser beam.
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(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Johannes Wahl, Christian Frey, John Powell, Felix Zaiß, Michael Haas, Simon Olschok, Christian Hagenlocher, Uwe Reisgen, and Thomas Graf "Characterizing the effect of the vapor plume on laser beam characteristics during laser beam welding", Proc. SPIE 12878, High-Power Laser Materials Processing: Applications, Diagnostics, and Systems XIII, 1287809 (12 March 2024); https://doi.org/10.1117/12.3002720
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KEYWORDS
Optical testing
Laser welding
Laser processing
Image processing
Measurement devices
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