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Weld line Charpy toughness investigations on High Frequency Induction (HFI) welded pipes and exploration of a method to achieve toughness improvements / SAMUEL BAKER

Swansea University Author: SAMUEL BAKER

DOI (Published version): 10.23889/SUThesis.68373

Abstract

The growth of the gas and oil industry into cold regions has driven the demand for high frequency induction welded pipes that are resistant to sour service. However, the toughness of the weld line can deteriorate in cold and harsh environments and producing a weld line that is resistant to these con...

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Published: Swansea University, Wales, UK 2024
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
Supervisor: Pleydell-Pearce, C.
URI: https://cronfa.swan.ac.uk/Record/cronfa68373
first_indexed 2024-11-28T19:47:26Z
last_indexed 2025-01-16T20:49:40Z
id cronfa68373
recordtype RisThesis
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spelling 2025-01-16T15:56:56.8339306 v2 68373 2024-11-28 Weld line Charpy toughness investigations on High Frequency Induction (HFI) welded pipes and exploration of a method to achieve toughness improvements b4ad59c74f9f67f0222237a8b6145412 SAMUEL BAKER SAMUEL BAKER true false 2024-11-28 The growth of the gas and oil industry into cold regions has driven the demand for high frequency induction welded pipes that are resistant to sour service. However, the toughness of the weld line can deteriorate in cold and harsh environments and producing a weld line that is resistant to these conditions is challenging since it is already difficult to guarantee acceptable weld line toughness with a sufficiently high level of confidence.Previous research has investigated the factors causing poor toughness. Nonetheless, the research was somewhat limited due to several reasons. The literature has also suggested that a more uniform temperature distribution during welding can improve the weld quality. However, justifications to why have not been determined.This researched aimed to develop a deeper understanding of the factors influencing the toughness of the weld line on a 16 mm thick X60 high frequency induction welded pipe, so subsequent rational could then be developed to establish why a more uniform temperature distribution during welding could improve the weld line toughness. If successful, this knowledge could then be used to develop a method to improve the temperature distribution, and thus enhance the weld line toughness.Characterisation and impact testing established the main factors influencing the toughness of the weld line. It was also discovered that the microstructure varied through the depth of the weld line, where the parts which experienced the greatest heating displayed the most undesirable features for satisfactory toughness. Therefore, it was concluded that by reducing the high temperatures in these regions, the overall microstructure could be improved, subsequently enhancing the toughness of the weld line. With this new knowledge, computational modelling was implemented to explore a method to improve the temperature distribution during welding. This was successful, and achieved by altering the geometry of the strip edges. E-Thesis Swansea University, Wales, UK Welding, toughness, HFI welded pipe, Charpy, high frequency induction welding 13 11 2024 2024-11-13 10.23889/SUThesis.68373 A selection of content is redacted or is partially redacted from this thesis to protect sensitive and personal information. COLLEGE NANME COLLEGE CODE Swansea University Pleydell-Pearce, C. Doctoral Ph.D Tata Steel, EPSRC & M2A Tata Steel, EPSRC & M2A 2025-01-16T15:56:56.8339306 2024-11-28T13:31:45.4985315 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering SAMUEL BAKER 1 68373__33361__3a35456afadc4232a446817d4192a742.pdf 2024_Baker_S.final.68373.pdf 2025-01-16T15:43:23.2930688 Output 13119894 application/pdf E-Thesis – open access true Copyright: The Author, Sam Baker, 2024 true eng
title Weld line Charpy toughness investigations on High Frequency Induction (HFI) welded pipes and exploration of a method to achieve toughness improvements
spellingShingle Weld line Charpy toughness investigations on High Frequency Induction (HFI) welded pipes and exploration of a method to achieve toughness improvements
SAMUEL BAKER
title_short Weld line Charpy toughness investigations on High Frequency Induction (HFI) welded pipes and exploration of a method to achieve toughness improvements
title_full Weld line Charpy toughness investigations on High Frequency Induction (HFI) welded pipes and exploration of a method to achieve toughness improvements
title_fullStr Weld line Charpy toughness investigations on High Frequency Induction (HFI) welded pipes and exploration of a method to achieve toughness improvements
title_full_unstemmed Weld line Charpy toughness investigations on High Frequency Induction (HFI) welded pipes and exploration of a method to achieve toughness improvements
title_sort Weld line Charpy toughness investigations on High Frequency Induction (HFI) welded pipes and exploration of a method to achieve toughness improvements
author_id_str_mv b4ad59c74f9f67f0222237a8b6145412
author_id_fullname_str_mv b4ad59c74f9f67f0222237a8b6145412_***_SAMUEL BAKER
author SAMUEL BAKER
author2 SAMUEL BAKER
format E-Thesis
publishDate 2024
institution Swansea University
doi_str_mv 10.23889/SUThesis.68373
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str 1
active_str 0
description The growth of the gas and oil industry into cold regions has driven the demand for high frequency induction welded pipes that are resistant to sour service. However, the toughness of the weld line can deteriorate in cold and harsh environments and producing a weld line that is resistant to these conditions is challenging since it is already difficult to guarantee acceptable weld line toughness with a sufficiently high level of confidence.Previous research has investigated the factors causing poor toughness. Nonetheless, the research was somewhat limited due to several reasons. The literature has also suggested that a more uniform temperature distribution during welding can improve the weld quality. However, justifications to why have not been determined.This researched aimed to develop a deeper understanding of the factors influencing the toughness of the weld line on a 16 mm thick X60 high frequency induction welded pipe, so subsequent rational could then be developed to establish why a more uniform temperature distribution during welding could improve the weld line toughness. If successful, this knowledge could then be used to develop a method to improve the temperature distribution, and thus enhance the weld line toughness.Characterisation and impact testing established the main factors influencing the toughness of the weld line. It was also discovered that the microstructure varied through the depth of the weld line, where the parts which experienced the greatest heating displayed the most undesirable features for satisfactory toughness. Therefore, it was concluded that by reducing the high temperatures in these regions, the overall microstructure could be improved, subsequently enhancing the toughness of the weld line. With this new knowledge, computational modelling was implemented to explore a method to improve the temperature distribution during welding. This was successful, and achieved by altering the geometry of the strip edges.
published_date 2024-11-13T05:29:03Z
_version_ 1864230704993271808
score 11.103813

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