Laser welding of Al-Li-Mg-Zr alloy

A. Twardowska; Jan P. Kusinski

doi:10.1117/12.405974

2 November 2000 Laser welding of Al-Li-Mg-Zr alloy

A. Twardowska, Jan P. Kusinski

Proceedings Volume 4238, Laser Technology VI: Applications; (2000) https://doi.org/10.1117/12.405974
Event: Laser Technology VI, 1999, Szczecin, Poland

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.

Citation Download Citation

A. Twardowska and Jan P. Kusinski "Laser welding of Al-Li-Mg-Zr alloy", Proc. SPIE 4238, Laser Technology VI: Applications, (2 November 2000); https://doi.org/10.1117/12.405974

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