Effect of welding polarity on bead geometry, microstructure, microhardness, and residual stresses of 1020 steel

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dc.contributor.authorAloraier, ASen_AU
dc.contributor.authorAl-Fadhalah, Ken_AU
dc.contributor.authorParadowska, AMen_AU
dc.contributor.authorAlfaraj, Een_AU
dc.date.accessioned2015-12-27T23:48:31Zen_AU
dc.date.available2015-12-27T23:48:31Zen_AU
dc.date.issued2014-01-01en_AU
dc.date.statistics2015-12-19en_AU
dc.description.abstractThis work examines the effect of welding polarity as a measure of heat input on the bead geometry, microstructure, microhardness and residual stresses of AISI 1020 carbon steel that was processed by shielded metal arc welding (SMAW). Single weld beads were deposited on the steel plate using a constant current but with different welding polarities of AC, DC- and DC+. Optical microscopy indicates that welding by DC- provides the widest weld bead and largest heat affected zone (HAZ) due to the large heat input subjected to the plate. Nevertheless, similar microstructures in the HAZ and fusion zone (FZ) of the weld were found for all welding polarities. Vickers microhardness tests also show that the large heat input by DC- polarity provided the minimum microhardness for all microstructures of the weld. In addition, across-weld measurements of the residual stresses by neutron diffraction indicate that the three welding polarities produced similar profile. High tensile longitudinal residual stresses were found to extend horizontally from the weld center to the HAZ, which become compressive further away from the bead. The highest tensile residual stress in the HAZ occurred for DC- polarity, while it has the lowest value for AC polarity. Throughthickness measurements also indicate that the residual stresses within the HAZ are approximately constant for AC polarity. This suggests that equal distribution of heat input by AC polarity to the electrode and plate is not only important for reducing residual stresses but also on minimizing the differences in residual stresses through the weld thickness. © 2015 Interdisciplinary Centre for Mathematical and Computational Modellingen_AU
dc.identifier.citationAloraier, A. S., Al-Fadhalah, K., Paradowska, A., & Alfaraj, E. (2014). Effect of welding polarity on bead geometry, microstructure, microhardness, and residual stresses of 1020 steel. Journal of Engineering Research 2(4), 137-160. doi:10.7603/s40632-014-0029-5en_AU
dc.identifier.govdoc6345en_AU
dc.identifier.issn2307-1885en_AU
dc.identifier.issue4en_AU
dc.identifier.journaltitleJournal of Engineering Researchen_AU
dc.identifier.pagination137-160en_AU
dc.identifier.urihttps://kuwaitjournals.org/jer/index.php/JER/homeen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/6478en_AU
dc.identifier.urihttps://kuwaitjournals.org/jer/index.php/JER/article/view/193en_AU
dc.identifier.volume2en_AU
dc.language.isoenen_AU
dc.publisherKuwait Journalsen_AU
dc.subjectWeldingen_AU
dc.subjectHeaten_AU
dc.subjectMicrohardnessen_AU
dc.subjectCarbon steelsen_AU
dc.subjectMicroscopyen_AU
dc.subjectNeutron diffractionen_AU
dc.titleEffect of welding polarity on bead geometry, microstructure, microhardness, and residual stresses of 1020 steelen_AU
dc.typeJournal Articleen_AU
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