6 February 2012 Bead characterization of disk-laser butt welding of thin AA 2024 sheets
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Abstract
Higher productivity, lower distortion and better penetration are the main advantages which laser welding provides in comparison with conventional processes. A Trumpf TruDisk 2002 Yb:YAG disk-laser is used in this work, as it increases productivity and quality. Materials which involve many technological issues in welding, resulting in shallow penetration and defects, are aluminum alloys. In particular, AA 2024 behaviour is investigated in the paper, being this alloy extensively used in automotive and aerospace industries. Defocusing has been considered, as it affects key-holes conditions. Bead-on-plate and butt autogenous welding tests in continuous wave emission on 1.25 mm thick sheets have been examined from morphological and microstructural point of view. Geometric and mechanical features of the welding bead have been evaluated via a 3-levels experimental plan with power, welding speed and defocusing as governing factors. Softening in the fused zone through Vickers microhardness test and magnesium loss through energy dispersive spectrometer analysis have been discussed. Optimal welding conditions have been suggested.
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Fabrizia Caiazzo, Fabrizia Caiazzo, Vittorio Alfieri, Vittorio Alfieri, Francesco Cardaropoli, Francesco Cardaropoli, Vincenzo Sergi, Vincenzo Sergi, } "Bead characterization of disk-laser butt welding of thin AA 2024 sheets", Proc. SPIE 8239, High Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications, 82390E (6 February 2012); doi: 10.1117/12.908576; https://doi.org/10.1117/12.908576
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