Influence of tool geometry and process parameters on the properties of friction stir spot welded multiple (AA 5754 H111) aluminium sheets

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dc.contributor.authorZlatanovic, Danka Labus
dc.contributor.authorBalos, Sebastian
dc.contributor.authorBergmann, Jean Pierre
dc.contributor.authorRasche, Stefan
dc.contributor.authorPecanac, Milan
dc.contributor.authorGoel, Saurav
dc.date.accessioned2021-03-04T10:41:05Z
dc.date.available2021-03-04T10:41:05Z
dc.date.issued2021-03-01
dc.description.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 investigationen_UK
dc.identifier.citationZlatanovic DL. Balos S, Bergmann JP, et al., (2021) Influence of tool geometry and process parameters on the properties of friction stir spot welded multiple (AA 5754 H111) aluminium sheets. Materials, Volume 14, Issue 5, 2021, Article number 1157en_UK
dc.identifier.issn1996-1944
dc.identifier.urihttps://doi.org/10.3390/ma14051157
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/16439
dc.language.isoenen_UK
dc.publisherMDPIen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectscanning acoustic microscopyen_UK
dc.subjectsmall punch testen_UK
dc.subject5754-H111 aluminium alloyen_UK
dc.subjecttool geometryen_UK
dc.subjectmultiple ultrathin sheetsen_UK
dc.subjectfriction stir spot weldingen_UK
dc.titleInfluence of tool geometry and process parameters on the properties of friction stir spot welded multiple (AA 5754 H111) aluminium sheetsen_UK
dc.typeArticleen_UK

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