Refining microstructure of medium-thick AA2219 aluminium alloy welded joint by ultrasonic frequency double-pulsed arc

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dc.contributor.authorWang, Yipeng
dc.contributor.authorLi, Hong
dc.contributor.authorLi, Zhuoxin
dc.contributor.authorZhang, Yu
dc.contributor.authorQin, Jian
dc.contributor.authorChen, Guangyu
dc.contributor.authorQi, Bojin
dc.contributor.authorZeng, Caiyou
dc.contributor.authorCong, Baoqiang
dc.date.accessioned2023-02-20T10:32:08Z
dc.date.available2023-02-20T10:32:08Z
dc.date.issued2023-02-14
dc.description.abstractThe increasing demand for achieving high-efficiency and high-quality medium-thick aluminium alloy welded structures, especially for large scale aerospace components, presents an urgent challenge to the conventional TIG arc welding process. This work proposed a novel double-pulsed variable polarity tungsten inert gas (DP-VPTIG) arc, in which the variable polarity square wave current was simultaneously modulated into ultrasonic frequency (20–80 kHz) and low frequency (0.5–10 Hz) pulses. Full penetration welds of 6 mm thick AA2219 aluminum alloy were successfully obtained by using this process. The microstructure and mechanical properties of the weld produced by DP-VPTIG arc were investigated, taking the conventional VPTIG arc as a comparative study. Results show that the microstructure of weld zone by DP-VPTIG arc showed an alternating distribution of fine equiaxed grain band and slightly coarse equiaxed grain band. Compared to VPTIG arc, the grain structure was effectively refined in the weld zone with DP-VPTIG arc, showing a significant reduction of average grain size by 51.2% along transverse section and 61.3% along longitudinal section. The morphology of α-Al+θ-CuAl2 eutectics transformed from continuously distributed netlike shape to separately distributed granular shape, and segregation of Cu solute element was obviously improved. The average microhardness of weld zone was increased by about 8.7% and 5.6% along transverse section and along longitudinal section. The tensile properties of ultimate tensile strength, yield strength and elongation were increased by 6.6%, 10.6% and 20.5%, respectively. The results provide a valuable basis for improving welding efficiency and joint quality through a hybrid pulsed arc.en_UK
dc.identifier.citationWang Y, Li H, Li Z, et al., (2023) Refining microstructure of medium-thick AA2219 aluminium alloy welded joint by ultrasonic frequency double-pulsed arc. Journal of Materials Research and Technology, Volume 23, March-April 2023, pp. 3048-3061en_UK
dc.identifier.issn2238-7854
dc.identifier.urihttps://doi.org/10.1016/j.jmrt.2023.01.174
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/19213
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectAluminum alloyen_UK
dc.subjectDouble pulseen_UK
dc.subjectTungsten inert gas weldingen_UK
dc.subjectMicrostructureen_UK
dc.subjectMechanical propertyen_UK
dc.titleRefining microstructure of medium-thick AA2219 aluminium alloy welded joint by ultrasonic frequency double-pulsed arcen_UK
dc.typeArticleen_UK

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