Influence of Tool Geometry and Process Parameters on the Properties of Friction Stir Spot Welded Multiple (AA 5754 H111) Aluminium Sheets

Journal article


Labus Zlatanovic, D., Balos, S., Bergmann, J., Rasche, Stefan, Pecanac, M. and Goel, S. (2021). Influence of Tool Geometry and Process Parameters on the Properties of Friction Stir Spot Welded Multiple (AA 5754 H111) Aluminium Sheets. Materials. 14 (5), p. e1157. https://doi.org/10.3390/ma14051157
AuthorsLabus Zlatanovic, D., Balos, S., Bergmann, J., Rasche, Stefan, Pecanac, M. and Goel, S.
AbstractFriction stir spot welding is an emerging spot-welding technology that offers opportunities for joining a wide range of materials with minimum energy consumption. To increase productivity, the present work addresses production challenges and aims to find solutions for the lap-welding of multiple ultrathin sheets with maximum productivity. Two convex tools with different edge radii were used to weld four ultrathin sheets of AA5754-H111 alloy each with 0.3 mm thickness. To understand the influence of tool geometries and process parameters, coefficient of friction (CoF), microstructure and mechanical properties obtained with the Vickers microhardness test and the small punch test were analysed. A scanning acoustic microscope was used to assess weld quality. It was found that the increase of tool radius from 15 to 22.5 mm reduced the dwell time by a factor of three. Samples welded with a specific tool were seen to have no delamination and improved mechanical properties due to longer stirring time. The rotational speed was found to be the most influential parameter in governing the weld shape, CoF, microstructure, microhardness and weld efficiency. Low rotational speeds caused a 14.4% and 12.8% improvement in joint efficiency compared to high rotational speeds for both tools used in this investigation.
Keywordsfriction stir spot welding; multiple ultrathin sheets; tool geometry; 5754-H111 aluminium alloy; small punch test; scanning acoustic microscopy
Year2021
JournalMaterials
Journal citation14 (5), p. e1157
PublisherMDPI
ISSN1996-1944
Digital Object Identifier (DOI)https://doi.org/10.3390/ma14051157
FunderCost Action
Ministry of Education, Science and Technological Development of the Republic of Serbia
Publication dates
Print01 Mar 2021
Online01 Mar 2021
Publication process dates
Deposited02 Mar 2021
Accepted23 Feb 2021
Publisher's version
File Access Level
Open
Licensehttps://creativecommons.org/licenses/by/4.0/
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