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    Internal Material Flow Layers in AA6082-T6 Butt-Joints during Bobbin Friction Stir Welding (2019)

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    2019 Tamadon Internal Flow metals-09-01059.pdf (9.192Mb)
    Type of Content
    Journal Article
    UC Permalink
    http://hdl.handle.net/10092/17444
    
    Publisher's DOI/URI
    https://doi.org/10.3390/met9101059
    
    Publisher
    MDPI AG
    ISSN
    2075-4701
    Language
    English
    Collections
    • Engineering: Journal Articles [1528]
    Authors
    Tamadon A
    Pons DJ
    Clucas D
    Sued K
    show all
    Abstract

    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 of the AA6082-T6 butt-joints in bobbin friction stir welding were evaluated using a set of developed reagents and optical microscopy. The key findings are that the dark curved patterns (conventionally called 'flow-arms'), are actually oxidation layers at the advancing side, and at the retreating side are elongated grains with a high-density of accumulation of sub-grain boundaries due to dynamic recrystallization. A model of discontinuous flow within the weld is proposed, based on the microscopic observations. It is inferred that the internal flow is characterized by packets of material ('flow patches') being transported around the pin. At the retreating side they experience high localized shearing at their mutual boundaries, as evidenced in high density of sub-grain boundaries. Flow patches at the advancing side are stacked on each other and exposed to oxidization.

    Citation
    Tamadon, Pons, Clucas, Sued Internal Material Flow Layers in AA6082-T6 Butt-Joints during Bobbin Friction Stir Welding. Metals. 9(10). 1059-1059.
    This citation is automatically generated and may be unreliable. Use as a guide only.
    Keywords
    bobbin friction stir welding; materials flow; metallography; AA6082-T6; weld defect
    ANZSRC Fields of Research
    40 - Engineering::4016 - Materials engineering::401607 - Metals and alloy materials
    40 - Engineering::4017 - Mechanical engineering::401707 - Solid mechanics
    40 - Engineering::4014 - Manufacturing engineering::401408 - Manufacturing processes and technologies (excl. textiles)

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    • Formation Mechanisms for Entry and Exit Defects in Bobbin Friction Stir Welding 

      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 ...
    • 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 ...
    • 3D-Printed Tool Shoulder Design for the Analogue Modelling of Bobbin Friction Stir Weld Joint Quality 

      Tamadon A; Pons DJ; Chakradhar K; Kamboj J; Clucas D; Clucas, Don (Walter de Gruyter GmbH, 2021)
      Abstract: A variety of tool shoulder designs comprising three families i.e. blade, spiral and circular shaped scrolls, were produced to improve the material flow and restrictions to avoid the tunnel void. The bobbin tools ...
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