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Qualitative and quantitative analysis of misaligned electrode degradation when welding galvannealed steel

Xing, Bobin; Yan, Shaohua; Zhou, Haiyang; Chen, Hua; Qin, Qing Hua

Description

Electrode misalignment, induced from the flexibility of welding machine gun of spot welder or the potential poor fit-up, leads to the high tendency of expulsion and asymmetric nugget shape. Yet very few studies have focused on the influence of misalignment on the electrode degradation and microstructure evolution of the electrode, especially when welding galvannealed steel. This paper investigates the degradation of such misaligned electrodes when spot welding galvannealed steel. To reveal its...[Show more]

dc.contributor.authorXing, Bobin
dc.contributor.authorYan, Shaohua
dc.contributor.authorZhou, Haiyang
dc.contributor.authorChen, Hua
dc.contributor.authorQin, Qing Hua
dc.date.accessioned2021-07-21T01:39:58Z
dc.identifier.citationXing, B., Yan, S., Zhou, H. et al. Qualitative and quantitative analysis of misaligned electrode degradation when welding galvannealed steel. Int J Adv Manuf Technol 97, 629–640 (2018). https://doi.org/10.1007/s00170-018-1958-1
dc.identifier.issn0268-3768
dc.identifier.urihttp://hdl.handle.net/1885/241041
dc.description.abstractElectrode misalignment, induced from the flexibility of welding machine gun of spot welder or the potential poor fit-up, leads to the high tendency of expulsion and asymmetric nugget shape. Yet very few studies have focused on the influence of misalignment on the electrode degradation and microstructure evolution of the electrode, especially when welding galvannealed steel. This paper investigates the degradation of such misaligned electrodes when spot welding galvannealed steel. To reveal its mechanism, the electrodes welded with galvannealed steel were examined after 10 and 200 welds with the slight misalignment. The electrodes were found to experience more severe degradation compared to the results from previous studies with the aligned electrodes. The results from energy-dispersive spectrum (EDS) analysis further confirmed that δ-Fe–Zn phase, a barrier from galvannealed coating for isolating Cu and Zn formation, was not uniformly distributed on the electrode tip. As a result, the initial electrode pitting took place after 50 welds. Furthermore, electron backscatter diffraction (EBSD) quantitatively analyzed the recrystallized grains of the worn electrodes, which underwent rotation under the asymmetric pressure distribution under misalignment. The calculated Taylor factor via EBSD mapping also indicated the declined portion of <111> grains accounted for the low deformation resistance of the worn electrode. Finally, electrode displacements were simultaneously collected in the experiments, of which the peak values accurately predicted the heat generation for each spot weld and accordingly predicted the electrode life.
dc.description.sponsorshipThe financial support from the Australian Research Council (Grant No. LP130101001) is fully acknowledged.
dc.publisherSpringer
dc.rights© 2018 Springer-Verlag London Ltd., part of Springer Nature
dc.sourceInternational Journal of Advanced Manufacturing Technology
dc.subjectResistance spot welding
dc.subjectElectrode wear
dc.subjectElectrode misalignment
dc.subjectElectrode displacement
dc.subjectElectron backscatter diffraction
dc.titleQualitative and quantitative analysis of misaligned electrode degradation when welding galvannealed steel
dc.typeJournal article
local.description.notesAdded manually as didn't import from ARIES
local.identifier.citationvolume97
dcterms.dateAccepted2018-03-23
dc.date.issued2018-04-07
local.identifier.ariespublicationa383154xPUB9707
local.publisher.urlhttps://link.springer.com/
local.type.statusPublished Version
local.contributor.affiliationXing, Bobin, College of Engineering and Computer Science, ANU
local.contributor.affiliationYan, Shaohua, College of Engineering and Computer Science, ANU
local.contributor.affiliationZhou, Haiyang, College of Engineering and Computer Science, ANU
local.contributor.affiliationChen, Hua, Centre for Advanced Microscopy, ANU
local.contributor.affiliationQin, Qing Hua, College of Engineering and Computer Science, ANU
local.description.embargo2099-12-31
dc.relationhttp://purl.org/au-research/grants/arc/LP130101001
local.bibliographicCitation.startpage629
local.bibliographicCitation.lastpage640
local.identifier.doi10.1007/s00170-018-1958-1
CollectionsANU Research Publications

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