Journal Article

PUBDB-2025-02370

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Avoiding the formation of pores during laser welding of copper hairpins by dynamic beam shaping

Reinheimer, E. N. (Corresponding author) ; Haas, M.Extern* ; Zaiß, F.Extern* ; Omlor, M. ; Spurk, C.Extern* ; Olowinsky, A.Extern* ; Beckmann, F.HZG*Hereon* ; Moosmann, J.HZG*Hereon* ; Hagenlocher, C.Extern* ; Weber, R. ; Graf, T.

2025
Springer London

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Please use a persistent id in citations: doi:10.1007/s00170-025-15236-0  doi:10.3204/PUBDB-2025-02370

Abstract: Any pores formed during laser welding of copper hairpins affect the structural integrity and the mechanical/electrical functionality of the joint. We report on investigations using synchrotron X-ray imaging techniques to observe the formation of the pores in the processing zone while welding. It was found that all pores are formed at the joint gap and that the small pores are distributed throughout the complete joint volume as a result of the melt flow induced by the movement of the laser beam. This insight has led to the development of a welding strategy that minimizes pore formation by avoiding the movement of the laser beam across the joint gap. This was achieved by rapid beam shaping based on coherent beam combining (CBC) technology.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. Helmholtz-Zentrum Hereon (Hereon)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. FS-Proposal: BAG-20211050 (BAG-20211050) (BAG-20211050)
3. DFG project G:(GEPRIS)236616214 - SFB 1120: Bauteilpräzision durch Beherrschung von Schmelze und Erstarrung in Produktionsprozessen (236616214) (236616214)
4. 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 2025

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; DEAL Springer ; Ebsco Academic Search ; Essential Science Indicators ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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