Journal
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
Volume 208, Issue 1-3, Pages 309-317Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2008.01.001
Keywords
Welding; Spot; Microstructure
Funding
- MIUR (Italian Ministry for University and Scientific Research) funds
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Friction stir spot welding (FSSW) has been proposed as an effective technology to spot weld the so-called difficult to be welded metal alloys. in the paper, a variation of the FSSW process has been considered. A tool path is given after the sinking phase nearby the initial penetration site; in this way a larger welding spot is obtained and more material is involved in the bonding process. The process mechanics of such modified FSSW process is highlighted and the joint strength undergoing tensile tests is considered at the varying both of the assigned tool path and of a few process parameters. Macro- and micro-analyses are made in order to analyze the local material microstructure evolution. It is found that improved performances, with respect to the traditional FSSW process, are obtained for all the considered case studies. (C) 2008 Elsevier B.V. All rights reserved.
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