Improving the Quality of Friction Stir Welds in Aluminium Alloys

The Stationary Shoulder Friction Stir Welding (SS-FSW) technique benefits from reduced heat input, improved mechanical properties and surface finish of the weld, avoiding the need for post weld processing. Coatings on the tool probe and the shoulder for welding of aggressive Aluminium alloys have ra...

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Bibliographic Details
Published in:Coatings (Basel) 2021, Vol.11 (5), p.539
Main Authors: Ehiasarian, Arutiun, Purandare, Yashodhan, Sugumaran, Arunprabhu, Hovsepian, Papken, Hatto, Peter, De Backer, Jeroen
Format: Article
Language:English
Subjects:
Alloys
Aluminum base alloys
Arc deposition
Chemical vapor deposition
Coatings
Coefficient of friction
Diamond-like carbon
Friction stir welding
Heat
High temperature
Magnetron sputtering
Mechanical properties
Multilayers
Protective coatings
Surface finish
Titanium
Tool wear
Workpieces
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Summary:The Stationary Shoulder Friction Stir Welding (SS-FSW) technique benefits from reduced heat input, improved mechanical properties and surface finish of the weld, avoiding the need for post weld processing. Coatings on the tool probe and the shoulder for welding of aggressive Aluminium alloys have rarely been successful. Such coatings must be well adherent and inert. In this study, coated tools were used for SS-FSW of AA6082-T6 alloy. Performance of a nanoscale multilayer TiAlN/VN coating deposited by High Power Impulse Magnetron Sputtering (HIPIMS) technology was compared with amorphous Diamond Like Carbon (a-C:H) by Plasma Assisted Chemical Vapour Deposition (PACVD), AlTiN deposited by arc evaporation and TiBCN along with TiB2 produced by Chemical Vapour Deposition (CVD) methods. The TiAlN/VN coating was found to have low affinity to aluminium, acceptable coefficient of friction and provided excellent weld quality by inhibiting intermixing between the tool and workpiece materials resulting in a significant reduction in tool wear.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings11050539