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Proceedings Paper

Laser-assisted friction stir welding of aluminum alloy lap joints: microstructural and microhardness characterizations
Author(s): Giuseppe Casalino; Sabina L. Campanelli; Nicola Contuzzi; Andrea Angelastro; Antonio D. Ludovico
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Paper Abstract

Friction Stir Welding (FSW) is a solid-state joining process; i.e., no melting occurs. The welding process is promoted by the rotation and translation of an axis-symmetric non-consumable tool along the weld centerline. Thus, the FSW process is performed at much lower temperatures than conventional fusion welding, nevertheless it has some disadvantages. The laser Assisted Friction Stir Welding (LAFSW) combines a Friction Stir Welding machine and a laser system. Laser power is used to preheat and to plasticize the volume of the workpiece ahead of the rotating tool; the workpiece is then joined in the same way as in the conventional FSW process. In this work an Ytterbium fiber laser with maximum power of 4 kW and a commercial FSW machine were coupled. Both FSW and LAFSW tests were conducted on 3 mm thick 5754H111 aluminum alloy plates in lap joint configuration with a constant tool rotation rate and with different feed rates. The two processes were compared and evaluated in terms of differences in the microstructure and in the micro-hardness profile.

Paper Details

Date Published: 20 February 2014
PDF: 8 pages
Proc. SPIE 8963, High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications III, 896316 (20 February 2014); doi: 10.1117/12.2042215
Show Author Affiliations
Giuseppe Casalino, Politecnico di Bari (Italy)
Sabina L. Campanelli, Politecnico di Bari (Italy)
Nicola Contuzzi, Politecnico di Bari (Italy)
Andrea Angelastro, Politecnico di Bari (Italy)
Antonio D. Ludovico, Politecnico di Bari (Italy)

Published in SPIE Proceedings Vol. 8963:
High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications III
Friedhelm Dorsch, Editor(s)

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