Internal Flow Behaviour and Microstructural Evolution of the Bobbin-FSW Welds: Thermomechanical Comparison between 1xxx and 3xxx Aluminium Grades (2021)
The influences of processing parameters and tool feature on the microstructure of AA1100 and AA3003 aluminium alloys were investigated using bobbin friction stir welding (BFSW). The research includes flow visualization and microstructural evolution of the weld texture using the metallographic measurement method. Results indicated that the operational parameters of the welding (e.g. feed rate, rotating speed) and the geometry of the tool can directly affect the flow patterns of the weld structure. The microscopic details revealed by the optical and electron microscope imply the dynamic recrystallization including grain refinement and precipitation mechanisms within the stirring zone of the weld region. The microscopic observations for the weld samples show a better performance of the fully-featured tool (tri-flat threaded pin and scrolled shoulders) compared to the simple tool without inscribed surface features. The fully-featured tool resulted in a more uniform thermomechanical plastic deformation within the weld structure along with the precipitation hardening and the homogeneity of the microstructure.</jats:p>
CitationTamadon A, Pons DJ, Sued K, Clucas D (2021). Internal Flow Behaviour and Microstructural Evolution of the Bobbin-FSW Welds: Thermomechanical Comparison between 1xxx and 3xxx Aluminium Grades. Advances in Materials Science. 21(2). 40-64.
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KeywordsBobbin Friction Stir Welding; AA1100; AA3003; internal flow; thermomechanical behaviour
ANZSRC Fields of Research40 - Engineering::4017 - Mechanical engineering::401708 - Tribology
40 - Engineering::4016 - Materials engineering::401607 - Metals and alloy materials
RightsAll rights reserved unless otherwise stated
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Flow-Based Anatomy of Bobbin Friction-Stirred Weld; AA6082-T6 Aluminium Plate and Analogue Plasticine Model Pons, Dirk; Tamadon, Abbas; Clucas, Don (MDPI AG, 2020)Material flow transportation around the rotating tool and the mass deposition at the backside of the tool are critical characteristics of friction stir welding. To achieve an optimized weld structure, the history of the ...
Tamadon A; Pons DJ; Clucas D; Sued K (MDPI AG, 2019)Bobbin friction stir welding with a double-sided tool configuration produces a symmetrical solid-state joint. However, control of the process parameters to achieve defect-free welds is difficult. The internal flow features ...
Sued K; Pons, Dirk; Tamadon, Abbas; Clucas, Don (MDPI AG, 2019)© 2019 by the authors. One of the difficulties with bobbin friction stir welding (BFSW) has been the visualisation of microstructure, particularly grain boundaries, and this is especially problematic for materials with ...