Friction stir welding of thick 7175 aluminium alloy plates for deepwater riser applications

Wang, Tianhao; Reza-E-Rabby, Md; Das, Hrishikesh; Grant, Glenn J.; Whalen, Scott

doi:10.1080/13621718.2023.2219908

Friction stir welding of thick 7175 aluminium alloy plates for deepwater riser applications

Journal Article · Wed Nov 01 00:00:00 EDT 2023 · Science and Technology of Welding and Joining

DOI:https://doi.org/10.1080/13621718.2023.2219908· OSTI ID:2310994

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Pacific Northwest National Laboratory, Richland, Washington, USA

To substantially reduce the cost of extracting petroleum from ultra-deepwater sources, manufacturing risers from 7175 aluminium (Al) alloys rather than steels is being considered. Friction stir welding (FSW), a solid-phase joining technique, is widely applied to 7XXX Al alloys because its mechanical properties are retained within the nugget zone. And, the primary technical objective of the current study is the development of high-strength, corrosion-resistant weldments that connect 7175 Al riser flanges and pipes. However, as the welding thickness increases, the welding speed can be greatly impeded, which lowers the manufacturing efficiency and weakens the mechanical properties in the heat affected zone (next to the nugget). Therefore, obtaining high-performance thick plate 7175 Al alloy joints via FSW is challenging. To overcome this dilemma, the current work optimises the tool design and welding parameters for achieving high-performance joints between 25.4 mm thick 7175 Al alloy plates in butt joint configuration.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 2310994

Journal Information:: Science and Technology of Welding and Joining, Journal Name: Science and Technology of Welding and Joining Journal Issue: 8 Vol. 28; ISSN 1362-1718

Publisher:: SAGE PublicationsCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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