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Proceedings Paper

Process instabilities by laser beam welding of aluminium alloys generated by laser modulations
Author(s): Martin Klassen; Jochen Skupin; Gerd Sepold
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Paper Abstract

One of the major problems by laser beam welding of aluminum alloys is still the appearance of seam imperfections. This problem, mainly due to weld instabilities can be reduced by the processing method. Nevertheless the origin of these welding process instabilities is not fully understood. The presented paper shows that the oscillation of the keyhole and the melt pool are in resonance dependent on the melting and vaporizing process. Due to the intensity of this resonance surface ripple irregularities, notches and blow- holes appear. Therefore it can be claimed, that resonant oscillations of the keyhole and the melt pool are one reason for the appearance of imperfections like blow-holes. The resonances were generated by artificial laser beam power modulations. Using this method imperfections like blow-holes were reproducibly produced.

Paper Details

Date Published: 18 August 1997
PDF: 10 pages
Proc. SPIE 3097, Lasers in Material Processing, (18 August 1997); doi: 10.1117/12.281072
Show Author Affiliations
Martin Klassen, Bremer Institut fuer Angewandte Strahltechnik (Germany)
Jochen Skupin, Bremer Institut fuer Angewandte Strahltechnik (Germany)
Gerd Sepold, Bremer Institut fuer Angewandte Strahltechnik (Germany)

Published in SPIE Proceedings Vol. 3097:
Lasers in Material Processing
Leo H. J. F. Beckmann, Editor(s)

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