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dc.contributor.advisorOguocha, Ikechukwukaen_US
dc.contributor.advisorYannacopoulos, Spiroen_US
dc.creatorHall, Alicia M.en_US
dc.date.accessioned2010-01-15T00:08:01Zen_US
dc.date.accessioned2013-01-04T04:24:01Z
dc.date.available2011-01-19T08:00:00Zen_US
dc.date.available2013-01-04T04:24:01Z
dc.date.created2010-01en_US
dc.date.issued2010-01en_US
dc.date.submittedJanuary 2010en_US
dc.identifier.urihttp://hdl.handle.net/10388/etd-01152010-000801en_US
dc.description.abstractSubmerged arc welding (SAW) is often the method of choice in pressure vessel fabrication. This process features high production rates, welding energy and/or welding speed and requires minimal operator skill. The selection of appropriate parameters in SAW is essential, not only to optimize the welding process in order to maintain the highest level of productivity, but also to obtain the most desirable mechanical properties of the weld. The focus of this study was to investigate the effect of welding speed on the properties of SA516 Grade 70. Plates of SA516 Gr. 70 steel 17 mm x 915 mm x 122 mm were submerged arc welded with a welding current of 700 A and welding speeds of 15.3, 12.3 and 9.3 mm/s. Following the welding; strength, microstructure, hardness and impact toughness of the specimens were examined. Charpy impact testing was performed according to ASTM E 23 on specimens notched in the weld metal (WM) and in the heat-affected zone (HAZ), to measure the impact toughness. Fractography was performed on broken specimens using optical and scanning electron microscopy in order to correlate the mechanisms of fracture with the impact toughness values. The highest hardness values were in the coarse-grained HAZ followed by the WM with the lowest hardness in the parent metal (PM). The HAZ had higher impact toughness than the WM and PM for all welding speeds. The slowest welding speed (9.3 mm/s) obtained complete penetration and therefore produced the most visually sound weld. The fastest welding speed (15.3 mm/s) had the narrowest HAZ and showed good ductile-to-brittle transition behaviour for both the WM and HAZ specimens, but produced incomplete penetration defects. Welding speed had little affect on the notch toughness of the HAZ with only a 9 J rise in upper shelf energy and an 8 °C drop in the impact transition temperature (ITT) with increased welding speed from 9.3 to 15.3 mm/s. However, for the WM, there was a 63 J drop in the upper shelf energy but also a 41 °C improvement of the ITT between the 9.3 and 15.3 mm/s welding speeds.en_US
dc.language.isoen_USen_US
dc.subjectimpact toughnessen_US
dc.subjectSA516 Gr. 70en_US
dc.subjectpressure vesselen_US
dc.subjectsubmerged arc weldingen_US
dc.subjectwelding speeden_US
dc.titleThe effect of welding speed on the properties of ASME SA516 grade 70 steelen_US
thesis.degree.departmentMechanical Engineeringen_US
thesis.degree.disciplineMechanical Engineeringen_US
thesis.degree.grantorUniversity of Saskatchewanen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Science (M.Sc.)en_US
dc.type.materialtexten_US
dc.type.genreThesisen_US
dc.contributor.committeeMemberYang, Qiaoqinen_US
dc.contributor.committeeMemberOdeshi, Akindeleen_US
dc.contributor.committeeMemberSumner, Daviden_US


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