Journal Article

PUBDB-2022-04389

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Pore formation and melt pool analysis of laser welded Al-Cu joints using synchrotron radiation

Hollatz, S. (Corresponding author)Extern* ; Hummel, M.Extern* ; Olowinsky, A.Extern* ; Gillner, A.Extern* ; Beckmann, F.Extern*HZG* ; Moosmann, J.Extern*HZG*

2022
Elsevier Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.jmatprotec.2022.117738  doi:10.3204/PUBDB-2022-04389

Abstract: Known as challenging material combination, the welding of aluminium and copper, both with strongly different thermophysical properties, causes joining failures such as pores, cracks or intermetallic phases in the solidified welding area. To investigate the mixing of the materials and the occurrence of pores, the laser welding process is observed with synchrotron radiation which visualizes the phase boundaries between solid, liquid and gaseous material phases. This allows the visualization of pore formation and density differences of the materials inside the melt pool. In this investigation, pore formation in front and bottom of the keyhole is observed. The movement of the bubbles in the melt pool can be tracked until solidification at the material transition. Regarding the intermixing of the materials, the high-speed images show a fluctuating copper flow towards the keyhole and a material mixing over the entire aluminium melt pool depth. By understanding the mechanisms, compensatory measures for an improved process can be developed to enable the usability of aluminium and copper connections, for example in electromobility applications.

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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: I-20191140 (I-20191140) (I-20191140)

Experiment(s):

1. PETRA Beamline P07 (PETRA III)

Appears in the scientific report 2022

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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