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Proceedings Paper

Laser welding of Al-Li-Mg-Zr alloy
Author(s): A. Twardowska; Jan P. Kusinski
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Paper Abstract

An Al-Li-Cu-Mg-Zr alloy was welded in helium atmosphere with CO2 laser. Full-penetration, single pass butt welds were produced which were generally characterized by low porosity, refined as-cast structure and narrow fusion and heat affected zones. Tensile properties for welded material were lowered in comparison to that measured for unwelded matrix. Initial YS of 487 MPa for unwelded material decreased to 268 Mpa after laser welding as well as the measured elongation decreased from 17.48% to 3.7% respectively. Studies by optical and electron scanning and transmission microcopies were provided in as-welded and as-deformed states to examine the joint's quality and microstructure. Laser produced joints failed in a brittle intergranular manner. The failure mode was connected with the presence of grain boundary precipitates and (delta) -precipitate free zones. The improvement of properties of laser welds was possible by use of appropriate postweld heat treatment.

Paper Details

Date Published: 2 November 2000
PDF: 6 pages
Proc. SPIE 4238, Laser Technology VI: Applications, (2 November 2000);
Show Author Affiliations
A. Twardowska, Univ. of Mining and Metallurgy (Poland)
Jan P. Kusinski, Univ. of Mining and Metallurgy (Poland)

Published in SPIE Proceedings Vol. 4238:
Laser Technology VI: Applications
Wieslaw L. Wolinski; Zdzislaw Jankiewicz, Editor(s)

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