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Weldability of Zircaloy-2 using autogenous gas tungsten arc welding
Dissertation (MEng)--University of Pretoria, 2018.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2019
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| _version_ | 1867613531729297408 |
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| access_status_str | Open Access |
| author2 | Pistorius, Pieter Georg Hendrik |
| author_browse | Pistorius, Pieter Georg Hendrik |
| author_facet | Pistorius, Pieter Georg Hendrik |
| collection | Thesis |
| dc_rights_str_mv | © 2019 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MEng)--University of Pretoria, 2018. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/71004 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:37:38.105Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2019 |
| publishDateRange | 2019 |
| publishDateSort | 2019 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/71004 Weldability of Zircaloy-2 using autogenous gas tungsten arc welding Pistorius, Pieter Georg Hendrik u25252713@tuks.co.za Magwentshu, Njingalwazi UCTD Zircaloy-2 GTAW Alpha phase Beta phase Phase transformation Engineering, built environment and information technology theses SDG-04 SDG-04: Quality education Engineering, built environment and information technology theses SDG-07 SDG-07: Affordable and clean energy Engineering, built environment and information technology theses SDG-09 SDG-09: Industry, innovation and infrastructure Dissertation (MEng)--University of Pretoria, 2018. The influence of heat input on the as-welded microstructure and hardness of autogenous bead-on-plate gas tungsten arc welds on nuclear grade Zircaloy-2 was investigated. In addition, the β-α transformation behaviour was examined using dilatometry. In particular, the transformation start and transformation end temperatures at various cooling rates were determined. The microstructure of the welded joints (heat input 10 to 90 J/mm) and of the dilatometry samples (at cooling rates of 600 to1.1°C/s) was predominately basket-weave. In the range of cooling rates used, the hardness did not change with the fraction basket-weave structure or the prior beta grain size. The hardness of the weld metal and heat affected zone was not sensitive to heat input or the use of a pulsed power supply for the range of heat input and welding speed investigated. There was no difference in hardness between contaminated welds and non-contaminated welds. Second phase particles found in the base material did not seem to be present in the weld metal or HAZ . The transformation start and transformation finish temperatures, on heating, for all the samples were 807°C to 1071°C. On cooling, transformation start and transformation end range was 801°C to 647°C. The cooling time from 900⁰C to 600⁰C, Δt 9-6, calculated for weld metal and HAZ was therefore considered an appropriate parameter. The findings show that Zircaloy- 2 has good weldability over wide range parameters and that practical welding problems such as shielding did not compromise the integrity of the welds. mi2025 Materials Science and Metallurgical Engineering MEng Unrestricted SDG-04: Quality education SDG-07: Affordable and clean energy SDG-09: Industry, innovation and infrastructure 2019-08-12T11:18:47Z 2019-08-12T11:18:47Z 2019/04/10 2018 Dissertation Magwentshu, N 2018, Weldability of Zircaloy-2 using autogenous gas tungsten arc welding, MEng Dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/71004> A2019 http://hdl.handle.net/2263/71004 en © 2019 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | UCTD Zircaloy-2 GTAW Alpha phase Beta phase Phase transformation Engineering, built environment and information technology theses SDG-04 SDG-04: Quality education Engineering, built environment and information technology theses SDG-07 SDG-07: Affordable and clean energy Engineering, built environment and information technology theses SDG-09 SDG-09: Industry, innovation and infrastructure Weldability of Zircaloy-2 using autogenous gas tungsten arc welding |
| title | Weldability of Zircaloy-2 using autogenous gas tungsten arc welding |
| title_full | Weldability of Zircaloy-2 using autogenous gas tungsten arc welding |
| title_fullStr | Weldability of Zircaloy-2 using autogenous gas tungsten arc welding |
| title_full_unstemmed | Weldability of Zircaloy-2 using autogenous gas tungsten arc welding |
| title_short | Weldability of Zircaloy-2 using autogenous gas tungsten arc welding |
| title_sort | weldability of zircaloy 2 using autogenous gas tungsten arc welding |
| topic | UCTD Zircaloy-2 GTAW Alpha phase Beta phase Phase transformation Engineering, built environment and information technology theses SDG-04 SDG-04: Quality education Engineering, built environment and information technology theses SDG-07 SDG-07: Affordable and clean energy Engineering, built environment and information technology theses SDG-09 SDG-09: Industry, innovation and infrastructure |
| url | http://hdl.handle.net/2263/71004 |