An experimental study on lap joining of multiple sheets of aluminium alloy (AA 5754) using friction stir spot welding

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dc.contributor.authorZlatanovic, Danka Labus
dc.contributor.authorBalos, Sebastian
dc.contributor.authorBergmann, Jean Pierre
dc.contributor.authorKöhler, Tobias
dc.contributor.authorGrätzel, Michael
dc.contributor.authorSidjanin, Leposava
dc.contributor.authorGoel, Saurav
dc.date.accessioned2020-05-07T14:21:22Z
dc.date.available2020-05-07T14:21:22Z
dc.date.issued2020-04-08
dc.description.abstractFriction stir spot welding (FSSW) process is widely used in the automobile industry for a range of applications such as battery components, standard wire connectors and terminals. This manuscript addresses two grand challenges in the arena of FSSW, hitherto, unaddressed in the extant literature: (i) lap joining of thin sheets (0.3 mm thickness) of AA 5754 alloy and (ii) lap joining of more than two sheets using FSSW. To accomplish this task, a novel pinless convex shaped tool was designed to alter the stress state while gradually advancing the tool which led to achieving stress state necessary for obtaining defect free lap joints. The weld joints were inspected by optical microscopy, SEM imaging and analysed by nanoindentation tests and Vickers microindentation tests for assessment of the quality of the weld interface (WI). Process parameters of FSSW such as torque on the tool and axially applied load were used to analytically obtain the average local measure of peak normal and axial stresses as well as the coefficient of friction in the contact zone. In samples welded at low rotational speeds, strain-hardening mechanism was seen dominating in contrast to samples welded at higher rotational speeds, which showed thermal softening. As a direct consequence of this, the samples welded at low rotational speeds showed much higher hardness at the weld surface than the samples welded at higher speeds. A strong transition of strain hardening to thermal softening was noticeable beyond an applied strain rate of 400 s-1.en_UK
dc.identifier.citationZlatanovic DL, Balos S, Bergmann JP, et al. (2020) An experimental study on lap joining of multiple sheets of aluminium alloy (AA 5754) using friction stir spot welding. International Journal of Advanced Manufacturing Technology, Volume 107, April 2020, pp. 3093-3107en_UK
dc.identifier.issn0268-3768
dc.identifier.urihttps://doi.org/10.1007/s00170-020-05214-z
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/15442
dc.language.isoenen_UK
dc.publisherSpringeren_UK
dc.rightsAttribution-NonCommercial 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/*
dc.subjectthermal softeningen_UK
dc.subjectstrain hardeningen_UK
dc.subject5754 H-111 aluminium alloyen_UK
dc.subjectthin sheeten_UK
dc.subjectconvex pinless toolen_UK
dc.subjectfriction stir spot weldingen_UK
dc.titleAn experimental study on lap joining of multiple sheets of aluminium alloy (AA 5754) using friction stir spot weldingen_UK
dc.typeArticleen_UK

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