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Proceedings Paper

Characterization of lap joints laser beam welding of thin AA 2024 sheets with Yb:YAG disk-laser
Author(s): Fabrizia Caiazzo; Vittorio Alfieri; Francesco Cardaropoli; Vincenzo Sergi
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Paper Abstract

Lap joints obtained by overlapping two plates are widely diffused in aerospace industry. Nevertheless, because of natural aging, adhesively bonded and riveted aircraft lap joints may be affected by cracks from rivets, voids or corrosion. Friction stir welding has been proposed as a valid alternative, although large heat affected zones are produced both in the top and the bottom plate due to the pin diameter. Interest has therefore been shown in studying laser lap welding as the laser beam has been proved to be competitive since it allows to concentrate the thermal input and increases productivity and quality. Some challenges arise as a consequence of aluminum low absorptance and high thermal conductivity; furthermore, issues are due to metallurgical challenges such as both micro and macro porosity formation and softening in the fused zone. Welding of AA 2024 thin sheets in a lap joint configuration is discussed in this paper: tests are carried out using a recently developed Trumpf TruDisk 2002 Yb:YAG disk-laser with high beam quality which allows to produce beads with low plates distortion and better penetration. The influence of the processing parameters is discussed considering the fused zone extent and the bead shape. The porosity content as well as the morphological features of the beads have been examined.

Paper Details

Date Published: 15 May 2012
PDF: 12 pages
Proc. SPIE 8433, Laser Sources and Applications, 84330Z (15 May 2012); doi: 10.1117/12.922551
Show Author Affiliations
Fabrizia Caiazzo, Univ. degli Studi di Salerno (Italy)
Vittorio Alfieri, Univ. degli Studi di Salerno (Italy)
Francesco Cardaropoli, Univ. degli Studi di Salerno (Italy)
Vincenzo Sergi, Univ. degli Studi di Salerno (Italy)

Published in SPIE Proceedings Vol. 8433:
Laser Sources and Applications
Thomas Graf; Jacob I. Mackenzie; Helena Jelínková; John Powell, Editor(s)

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