Impact of weld restraint on the development of distortion and stress during the electron beam welding of a low-alloy steel subject to solid state phase transformation

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dc.contributor.authorSun, Y. L.
dc.contributor.authorVasileiou, A. N.
dc.contributor.authorPickering, E. J.
dc.contributor.authorCollins, J.
dc.contributor.authorObasi, G.
dc.contributor.authorAkrivos, V.
dc.contributor.authorSmith, M. C.
dc.date.accessioned2021-05-12T10:00:25Z
dc.date.available2021-05-12T10:00:25Z
dc.date.issued2021-01-21
dc.description.abstractElectron beam (EB) welding has a low tolerance to inter-part gapping distortion and can generate complicated stresses, which pose challenges to weld quality and integrity. This study investigates welding distortion and stresses in an EB welded plate made from SA508 Grade 4N low-alloy steel. A thermal-metallurgical-mechanical model was developed to predict the temperature, micro-constituents, hardness, distortion and stresses in the EB weldment; the predictions are in good agreement with experimental results. Different restraint conditions on the weld plane were modelled to examine their effects on distortion and stresses. If welding is performed with no restraint, inter-part gapping develops ahead of the beam position that could exceed the tolerance for a sound weld. In contrast, tack welds at the plate ends significantly reduce this gapping, but induce additional tensile stress at the stop-end tack weld. This stress is particularly high as the beam approaches the tack weld. Increasing the extent of the tack weld reduces the tensile stress, while increasing number of distantly distributed narrow tack welds does not help. A full through-length restraint eliminates the opening gap and minimises the development of tensile stresses ahead of the beam that could potentially break the restraint. The applied restraint on the weld plane has little effect on the final residual stress field, since this field mostly develops during cooling after the EB weld is complete. The weld-induced martensitic transformation suppressed tension or promoted compression in the EB weld and heat affected zone (HAZ). A steep gradient of residual stress exists, with high tensile stress concentrated in a narrow region immediately outside the HAZ.en_UK
dc.identifier.citationSun YL, Vasileiou AN, Pickering EJ, et al., (2021) Impact of weld restraint on the development of distortion and stress during the electron beam welding of a low-alloy steel subject to solid state phase transformation. International Journal of Mechanical Sciences, Volume 196, April 2021, Article number 106244en_UK
dc.identifier.issn0020-7403
dc.identifier.urihttps://doi.org/10.1016/j.ijmecsci.2020.106244
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/16671
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectResidual stressen_UK
dc.subjectPower beam weldingen_UK
dc.subjectTack welden_UK
dc.subjectDistortion mitigationen_UK
dc.subjectNuclear steelen_UK
dc.subjectMicrostructureen_UK
dc.titleImpact of weld restraint on the development of distortion and stress during the electron beam welding of a low-alloy steel subject to solid state phase transformationen_UK
dc.typeArticleen_UK
dcterms.dateAccepted2020-12-18

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