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Compression ratio effects in bobbin friction stir welding
Citation
Sued, MK and Pons, D and Lavroff, J, Compression ratio effects in bobbin friction stir welding, Proceedings of the 10th International Friction Stir Welding Symposium, 20-22 May 2014, Beijing, China, pp. 292-310. ISBN 978-1-5108-0025-0 (2014) [Refereed Conference Paper]
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Copyright Statement
Copyright 2014 TWI
Official URL: http://www.fswsymposium.co.uk/
Abstract
The mechanism for generating shoulder friction is dependent, in the
bobbin case, on the interference (compression) between the substrate
(plate thickness) and tool (shoulder gap). In the present work, the effects
of different interference were evaluated. The substrate under evaluation
in this work is thin plate aluminium. Results show that the interference
affects the dynamic behaviour of the tool, the temperature, and the weld
quality. Unstable force occurs because of minimum contact between
shoulder and substrate hence material stirring is not efficient. Forces are
more stable at high shoulder interference. Higher force and temperature
are generated for higher interference, along with greater rind flash
formation. Of the interferences examined here, the intermediate case
(3.75% interference) is recommended, though the weld quality is
improved by the provision of additional tool features such as flats. The
paper develops a theory, based on empirical data, for the effects of
shoulder interference. It also proposes a mechanism for slip-stick, which
is given in terms of a dynamic interaction between an elastic tool and a
viscoplastic substrate. The proposed casual relationships are
summarised using a systems engineering approach. Implications for
practitioners are that assembly tolerances and restraints used in BFSW
need to be such that the parts are firmly held together, otherwise slipstick
behaviours result.
Item Details
Item Type: | Refereed Conference Paper |
---|---|
Keywords: | friction stir welding |
Research Division: | Engineering |
Research Group: | Mechanical engineering |
Research Field: | Mechanical engineering not elsewhere classified |
Objective Division: | Manufacturing |
Objective Group: | Other manufacturing |
Objective Field: | Other manufacturing not elsewhere classified |
UTAS Author: | Lavroff, J (Dr Jason Ali-Lavroff) |
ID Code: | 94027 |
Year Published: | 2014 |
Deposited By: | Engineering |
Deposited On: | 2014-08-27 |
Last Modified: | 2017-11-02 |
Downloads: | 10 View Download Statistics |
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