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Keywords = orbital friction stir welding

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46 pages, 17297 KiB  
Review
A Review of Orbital Friction Stir Welding
by Francisco B. Ferreira, Igor Felice, Isaque Brito, João Pedro Oliveira and Telmo Santos
Metals 2023, 13(6), 1055; https://doi.org/10.3390/met13061055 - 31 May 2023
Cited by 8 | Viewed by 4299
Abstract
Friction stir welding is a solid-state joining process widely used in several industrial applications. One of its variants, orbital friction stir welding, is of key importance in fundamental industries such as oil and gas and aerospace. For orbital friction stir welding, there is [...] Read more.
Friction stir welding is a solid-state joining process widely used in several industrial applications. One of its variants, orbital friction stir welding, is of key importance in fundamental industries such as oil and gas and aerospace. For orbital friction stir welding, there is a need to develop not only new process parameters but also tools and ancillary mechanisms that can ensure sound, high-performing joints are obtained. This review assesses the current state of orbital friction stir welding, highlighting several key aspects related to this technology. Full article
(This article belongs to the Special Issue Advanced Studies in Metal Joining)
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16 pages, 5096 KiB  
Article
Mechanical and Microstructural Properties of HDPE Pipes Manufactured via Orbital Friction Stir Welding
by Hesam Mehdikhani, Amir Mostafapour, Hossein Laieghi, Reza Najjar and Francesca Lionetto
Materials 2022, 15(11), 3810; https://doi.org/10.3390/ma15113810 - 27 May 2022
Cited by 11 | Viewed by 4545
Abstract
In recent decades, extensive research has been performed on the friction stir welding of flat-shaped materials while pipe welding, particularly polymer pipes, still encounters challenging issues. This work presents a feasible route for joining high-density polyethylene (HDPE) pipes using an orbital friction stir [...] Read more.
In recent decades, extensive research has been performed on the friction stir welding of flat-shaped materials while pipe welding, particularly polymer pipes, still encounters challenging issues. This work presents a feasible route for joining high-density polyethylene (HDPE) pipes using an orbital friction stir welding (OFSW) set-up properly designed with a retractable pin tool. Fully consolidated joints were achieved using a portable heating-assisted OFSW system suited for on-site pipeline welding. The obtained joined pipes were characterized by a high-quality weld surface and a lack of defects arising from the tool-pin hole. The samples welded with the optimum parameters presented comparable properties with the base materials and even a slight increase in the tensile strength. The highest tensile and impact strengths were 14.4 MPa and 2.45 kJ/m2, respectively, which is 105% and 89% of those of the base material. XRD, FTIR, and SEM were also applied to assess the property changes in the HDPE pipes after the FSW process. The morphological analysis evidenced that the crystalline structure of the welded sample was similar to that of the base material, proving the effectiveness of the proposed technology. Full article
(This article belongs to the Special Issue Ultrasound for Material Characterization and Processing II)
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