Contribution to a conference proceedings

PUBDB-2021-02968

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Temporally and spatially highly resolved reconstruction of vapor capillary geometry during laser beam welding using synchrotron radiation

Hummel, M. (Corresponding author)RWTH* ; Haeusler, A.Extern* ; Hollatz, S.Extern* ; Hagenlocher, C.Extern* ; Lind, J.Extern* ; Halm, U.Extern* ; Schoeler, C.Extern* ; Olowinsky, A.Extern* ; Gillner, A.RWTH*

2021

Abstract: Welds of electrical components made of aluminium and copper need high electrical and mechanical quality. Process instabilities do not allow a continuous reproducibility. To generate a deeper understanding of the process and to evaluate process dynamics, it is possible to use modern in situ analysis methods. In this work, in situ phase-contrast high-speed videography using synchrotron radiation is presented. The phase contrast method reveals the phase boundaries between solid, liquid, and gaseous phases. A spatial resolution down to < 20 μm is possible due to the high coherence of the synchrotron beam, which allows to observe small vapor capillaries of fiber lasers with < 100 μm diameter. 3D capillary geometries are reconstructed from 2D image data of welds on aluminium using a fibre laser and disc laser. Ray tracing is performed using this reconstruction, which allows the time resolved tracking ofthe laser beam inside the vapor capillary for quantitative estimations.

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Contributing Institute(s):

1. FS-Photon Science (FS-PS)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. FS-Proposal: I-20191140 (I-20191140) (I-20191140)
3. SFB 1120 A01 - Steuerung von Geometrie und Metallurgie beim Laserstrahl-Mikroschweißen durch Beeinflussung der Schmelzbaddynamik über örtlich und zeitlich angepassten Energieeintrag (A01) (260036706) (260036706)

Experiment(s):

1. PETRA Beamline P07 (PETRA III)

Appears in the scientific report 2021

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