Flow-Based Anatomy of Bobbin Friction-Stirred Weld; AA6082-T6 Aluminium Plate and Analogue Plasticine Model (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 plastic deformation needs to be identified with a flow-based elucidation. In this study, an analogue model was applied to evaluate the formation of a banded structure using the bobbin tool, with a focus on the interaction between the tool-workpiece. The flow visualization in plasticine analogue was validated in comparison with the aluminium welds. The plastic flow mechanism was visualized both, at the surface and the cross-section of the weld-seam. The cross-section of the weld shows the details of the formation of tunnel voids, caused by the failure of the flow regimes. A physical model of the material flow was proposed to explain the formation mechanism of the tunnel void as a discontinuity during the mass refilling at the rear of the tool.
CitationTamadon A, Pons DJ, Clucas D (2020). Flow-Based Anatomy of Bobbin Friction-Stirred Weld; AA6082-T6 Aluminium Plate and Analogue Plasticine Model. Applied Mechanics. 1(1). 3-19.
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Keywordsbobbin friction stir welding; aluminium; analogue model; plastic deformation; material flow; tunnel void defect
ANZSRC Fields of Research40 - Engineering::4016 - Materials engineering::401607 - Metals and alloy materials
40 - Engineering::4017 - Mechanical engineering::401707 - Solid mechanics
RightsAll rights reserved unless otherwise stated
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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 ...
Tamadon, A.; Pons, D.J.; Sued, K.; Clucas, D. (2018): Bobbin friction stir welding (BFSW) is an innovative variant for the solid state welding process whereby a rotating symmetrical tool causes a fully penetrated bond. Despite the process development, there are still ...
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 ...