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Proceedings Paper

Characterization of disk-laser dissimilar welding of titanium alloy Ti-6Al-4V to aluminum alloy 2024
Author(s): Fabrizia Caiazzo; Vittorio Alfieri; Francesco Cardaropoli; Gaetano Corrado; Vincenzo Sergi
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Paper Abstract

Both technical and economic reasons suggest to join dissimilar metals, benefiting from the specific properties of each material in order to perform flexible design. Adhesive bonding and mechanical joining have been traditionally used although adhesives fail to be effective in high-temperature environments and mechanical joining are not adequate for leak-tight joints. Friction stir welding is a valid alternative, even being difficult to perform for specific joint geometries and thin plates. The attention has therefore been shifted to laser welding. Interest has been shown in welding titanium to aluminum, especially in the aviation industry, in order to benefit from both corrosive resistance and strength properties of the former, and low weight and cost of the latter. Titanium alloy Ti-6Al-4V and aluminum alloy 2024 are considered in this work, being them among the most common ones in aerospace and automotive industries. Laser welding is thought to be particularly useful in reducing the heat affected zones and providing deep penetrative beads. Nevertheless, many challenges arise in welding dissimilar metals and the aim is further complicated considering the specific features of the alloys in exam, being them susceptible to oxidation on the upper surface and porosity formation in the fused zone. As many variables are involved, a systematic approach is used to perform the process and to characterize the beads referring to their shape and mechanical features, since a mixture of phases and structures is formed in the fused zone after recrystallization.

Paper Details

Date Published: 22 February 2013
PDF: 11 pages
Proc. SPIE 8603, High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications II, 86030I (22 February 2013); doi: 10.1117/12.2004681
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)
Gaetano Corrado, Univ. degli studi di Salerno (Italy)
Vincenzo Sergi, Univ. degli Studi di Salerno (Italy)

Published in SPIE Proceedings Vol. 8603:
High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications II
Friedhelm Dorsch, Editor(s)

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