Friction stir spot welding (FSSW) has been proposed as an effective technology to spot weldthe so-called “difficult to be welded” metal alloys. In the paper, a variation of the FSSWprocess has been considered. A tool path is given after the sinking phase nearby the initialpenetration site; in this way a larger welding spot is obtained and more material isinvolved in the bonding process. The process mechanics of such modified FSSW processis highlighted and the joint strength undergoing tensile tests is considered at the varyingboth of the assigned tool path and of a few process parameters. Macro- and micro-analysesare made in order to analyze the local material microstructure evolution. It is found thatimproved performances, with respect to the “traditional” FSSW process, are obtained for allthe considered case studies.
|Numero di pagine||9|
|Rivista||Journal of Materials Processing Technology|
|Stato di pubblicazione||Published - 2008|
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