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Materials 2013, 6(12), 5923-5941; doi:10.3390/ma6125923
Article

Analysis and Comparison of Friction Stir Welding and Laser Assisted Friction Stir Welding of Aluminum Alloy

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* ,
 and
Dip. di Meccanica, Matematica e Management, Politecnico di Bari, Viale Japigia 182, 70126 Bari, Italy
* Author to whom correspondence should be addressed.
Received: 1 August 2013 / Revised: 19 November 2013 / Accepted: 9 December 2013 / Published: 18 December 2013
(This article belongs to the Section Structure Analysis and Characterization)
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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. Laser Assisted Friction Stir Welding (LAFSW) is a combination in which the FSW is the dominant welding process and the laser pre-heats the weld. In this work FSW and LAFSW tests were conducted on 6 mm thick 5754H111 aluminum alloy plates in butt joint configuration. LAFSW is studied firstly to demonstrate the weldability of aluminum alloy using that technique. Secondly, process parameters, such as laser power and temperature gradient are investigated in order to evaluate changes in microstructure, micro-hardness, residual stress, and tensile properties. Once the possibility to achieve sound weld using LAFSW is demonstrated, it will be possible to explore the benefits for tool wear, higher welding speeds, and lower clamping force.
Keywords: friction stir welding; hybrid laser friction stir welding; welding speed; microstructure; micro-hardness; residual stress friction stir welding; hybrid laser friction stir welding; welding speed; microstructure; micro-hardness; residual stress
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Campanelli, S.L.; Casalino, G.; Casavola, C.; Moramarco, V. Analysis and Comparison of Friction Stir Welding and Laser Assisted Friction Stir Welding of Aluminum Alloy. Materials 2013, 6, 5923-5941.

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