PUMA publications for /user/jwahl/macromaterialprocessing%20processdevelopementWed May 08 18:35:08 CEST 2024Measurement of the influence of the vapor plume on laser beam characteristics during laser beam welding2023BeamCharacterisation Diagnostics Laser MacroMaterialProcessing ProcessDevelopement Welding YbYag myown During deep penetration laser welding a plume of hot metal vapor and particles is ejected by the keyhole. This vapor plume interacts with the incident laser beam by the means of scattering, absorption and phase front deformation. Within this work we present a measurement setup for diagnostics of the interaction characteristics. The setup combines a high-speed video with the measurement of the emitted spectrum of the vapor plume. This allows the location and differentiation between different zones of interaction between the laser beam and the plume. This knowledge will assist in the avoidance of weld defects which are induced by the vapor plume.Wed May 08 18:27:30 CEST 2024Fundamentals and Process SimulationProc. LiMMeasurement of the influence of the vapor plume on laser beam characteristics during laser beam welding2023BeamCharacterisation Diagnostics Laser MacroMaterialProcessing ProcessDevelopement Welding YbYag myown During deep penetration laser welding a plume of hot metal vapor and particles is ejected by the keyhole. This vapor plume interacts with the incident laser beam by the means of scattering, absorption and phase front deformation. Within this work we present a measurement setup for diagnostics of the interaction characteristics. The setup combines a high-speed video with the measurement of the emitted spectrum of the vapor plume. This allows the location and differentiation between different zones of interaction between the laser beam and the plume. This knowledge will assist in the avoidance of weld defects which are induced by the vapor plume.Wed May 08 18:14:38 CEST 2024Characterizing the effect of the vapor plume on laser beam characteristics during laser beam welding2024BeamCharacterisation Diagnostics Laser MacroMaterialProcessing ProcessDevelopement Welding YbYag myown 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 highfrequency 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.Wed May 08 17:24:05 CEST 2024High-Power Laser Materials Processing: Applications, Diagnostics, and Systems XIIImarProc. SPIECharacterizing the effect of the vapor plume on laser beam characteristics during laser beam welding128782024BeamCharacterisation Diagnostics Laser MacroMaterialProcessing ProcessDevelopement Welding YbYag myown 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 highfrequency 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.