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Stationary shoulder FSW for joining high strength aluminum alloys
Hao Wu, Ying-Chun Chen, David Strong, Phil Prangnell
Journal of Materials Processing Technology. 2015;221:187-196.
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Abstract
The new process of ‘stationary shoulder’ friction stir welding (SSFSW) has been directly compared toconventional (friction stir welding) using welds produced in a high strength AA7050-T7651 aluminiumaerospace alloy. The process window for each approach was first compared using torque–rotation ratedecay curves. Under optimum process conditions, SSFSW had a ∼30% lower heat input than FSW and thestationary shoulder resulted in narrower welds with a reduced heat affected zone (HAZ) width. The SSFSWwelds also had more uniform through thickness properties and performed better than conventional FSWsin cross-weld tensile tests. In addition it is demonstrated that the SSFSW process resulted in a far superiorsurface finish, although the stationary shoulder led to surface ‘speed cracking’ under certain weldingconditions. The reasons for these benefits are discussed aided by thermal and hardness modelling.
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