Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 527, Issue 16-17, Pages 4152-4160Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2010.03.026
Keywords
Friction stir welding; Modelling; Material flow; Heat transfer; Torque; Aluminium alloy
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Funding
- National Science and Engineering Research Council (NSERC)
- National Research Council of Canada (NRC)
- REGAL research center
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Finite element modelling of material flow is used to understand physical phenomena occurring during the dwell phase of friction stir welding (FSW) of thin sheets made of 7075 aluminium alloy. Numerical results are compared to reference experimental data including torque measurements and metallographic observations made at different tool rotational speeds. The effects of the material constitutive parameters and the heat transfer coefficient between the welded sheet and the anvil backing are identified. The model is also used to study the contact at the tool/workpiece interface. Comparison between the experimental and calculated torques shows that the contact condition depends on tool rotational speed. This result is supported by the differences between nugget grain size and nugget shape evolutions obtained with different rotational speed. (C) 2010 Elsevier B.V. All rights reserved.
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