Friction stir welding characteristics of 2219-T6 aluminum alloy assisted by external non-rotational shoulder

Friction stir welding (FSW) of 2219-T6 aluminum alloy assisted by external non-rotational shoulder was carried out, and effects of the welding speed on microstructures and mechanical properties were investigated in detail. Defect-free joints were obtained in a wide range of welding speeds from 50 to...

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Bibliographic Details
Published in:International journal of advanced manufacturing technology 2013-02, Vol.64 (9-12), p.1685-1694
Main Authors: Liu, H. J., Li, J. Q., Duan, W. J.
Format: Article
Language:English
Subjects:
Aluminum alloys
Aluminum base alloys
CAE) and Design
Computer-Aided Engineering (CAD
Deformation
Diamond pyramid hardness
Engineering
Friction stir welding
Industrial and Production Engineering
Inhomogeneity
Mechanical Engineering
Mechanical properties
Media Management
Microstructure
Original Article
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Summary:Friction stir welding (FSW) of 2219-T6 aluminum alloy assisted by external non-rotational shoulder was carried out, and effects of the welding speed on microstructures and mechanical properties were investigated in detail. Defect-free joints were obtained in a wide range of welding speeds from 50 to 300 mm/min. The microstructural deformation and weld formation were dominated by the rotating tool pin and subsize concave shoulder but the non-rotational shoulder exerted very little effects for all joints. Compared with the weld obtained by conventional FSW, less intense stirring effects in FSW assisted by external non-rotational shoulder can only generate a narrower thermomechanically affected zone, whose width decreased with increasing of the welding speed. Microstructures and Vickers hardness distributions showed that this new welding process is beneficial to improving the asymmetry and inhomogeneity, especially in the weld nugget zone. The maximum tensile strength was up to 69 % of the base material.
ISSN:0268-3768
1433-3015
DOI:10.1007/s00170-012-4132-1