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Metals
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Advances in Friction Stir Welding and Processing (2nd Edition)
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Advances in Friction Stir Welding and Processing (2nd Edition)

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Additive Manufacturing".

Deadline for manuscript submissions: 15 September 2024 | Viewed by 2451

Special Issue Editor

Prof. Dr. Michael Regev

E-Mail Website
Guest Editor
Department of Mechanical Engineering, Braude College of Engineering, Karmiel 2161401, Israel
Interests: metallurgy; magnesium alloys; amorphous alloys; friction stir welding and processing of Al, Cu, Mg and Ti alloys; high temperature mechanical properties; joining processes
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The friction stir welding process (FSW) was developed in the early 1990s. Over the years, FSW proved itself ideal for creating good-quality butt joints and lap joints in several materials, especially the family of nonferrous metallic materials, including even those that are extremely difficult to weld by conventional fusion-welding processes. During FSW, the generated frictional heat is effectively utilized to facilitate material consolidation and eventual joining with the aid of axial pressure. The process is, therefore, a non-fusion welding process. As of today, FSW is, due to its advantages, a common industrial welding process. Friction stir processing (FSP) was derived from FSW to use severe plastic deformation to obtain a stirred zone with a very fine grain size and hence, to improve the mechanical properties of the material. FSP is identical to FSW except that in FSP, the rotating tool does not weld the parts to one another. Thus, its operation may be referred to as a ‘‘bead on plate’’ process. It is my pleasure to invite you to submit a manuscript in the fields of FSW and FSP for this Special Issue. Full papers, communications, and reviews are all welcome.

Prof. Dr. Michael Regev
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Metals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • friction stir welding
  • friction stir processing
  • mechanical properties
  • microstructure

Published Papers (2 papers)

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Research

14 pages, 11861 KiB  
Article
Towards Understanding the Relationships between Processing Conditions and Mechanical Performance of the Additive Friction Stir Deposition Process
by Malcolm B. Williams, Ning Zhu, Nick I. Palya, Jacob B. Hoarston, Martin M. McDonnell, Matthew R. Kelly, Aaron D. Lalonde, Luke N. Brewer, James B. Jordon and Paul G. Allison
Metals 2023, 13(10), 1663; https://doi.org/10.3390/met13101663 - 28 Sep 2023
Cited by 1 | Viewed by 977
Abstract
In this research, we explore the preliminary effects of processing conditions using a novel additive manufacturing (AM) process, known as additive friction stir deposition (AFSD), on resulting build direction (BD) mechanical performance. Using the AFSD process, a feasibility study of three AM builds [...] Read more.
In this research, we explore the preliminary effects of processing conditions using a novel additive manufacturing (AM) process, known as additive friction stir deposition (AFSD), on resulting build direction (BD) mechanical performance. Using the AFSD process, a feasibility study of three AM builds of identical size are created using differentiating processing parameters. A relationship referred to as the deposition pitch, exhibiting similarities to weld pitch, is determined to be a simple but effective predictor of the interlayer bonding in AFSD processing of AA7020. The deposition pitch directly correlates the necessary temperature, time, and pressure required for effective solid-state bonding. Using this correlation, increased mechanical performance in the BD is achieved through an increase in deposition pitch. A reduction in the deposition pitch from 4.46 rev/mm to 1.08 rev/mm resulted in a significant decrease in failure strain from 24.4% to 0.82%, with the failure mechanism shifting from a ductile failure to brittle failure. The inverse relationship between grain refinement and BD failure strain at high deposition pitches suggests deposition pitch and heat input are the dominant factors in the resulting BD mechanical properties. Full article
(This article belongs to the Special Issue Advances in Friction Stir Welding and Processing (2nd Edition))
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13 pages, 6681 KiB  
Article
A Study of the Metallurgical and Mechanical Properties of Friction-Stir-Welded Pure Titanium
by Michael Regev, Benny Almoznino and Stefano Spigarelli
Metals 2023, 13(3), 524; https://doi.org/10.3390/met13030524 - 05 Mar 2023
Cited by 4 | Viewed by 1117
Abstract
Commercially pure titanium (CP-Ti) plates were friction-stir welded (FSWed) using a welding tool with a tungsten carbide (WC) pin. The bead-on-plate technique was applied to reduce the effects of welding defects, such as incomplete penetration. An X-ray inspection and fractography showed that the [...] Read more.
Commercially pure titanium (CP-Ti) plates were friction-stir welded (FSWed) using a welding tool with a tungsten carbide (WC) pin. The bead-on-plate technique was applied to reduce the effects of welding defects, such as incomplete penetration. An X-ray inspection and fractography showed that the FSWed material was free of defects and of WC particles, which may have originated from the welding tool. The appearance of refined equiaxed grains in the thermo-mechanically affected zone (TMAZ) may have been related to dynamic recrystallization (DRX) occurring during the FSW due to the high temperature and intensive plastic deformation involved in the process. Grain refinement, mechanical twinning, and increased dislocation density were detected within the TMAZ, and these microstructural changes were considered to be responsible for the improved mechanical properties of the TMAZ. The TEM study reported in the current paper revealed the presence of nano-sized grains in the FSWed material due to dynamic recrystallization (DRX) occurring during the processing stage. The microstructure obtained during FSW of Ti has been reported in a several publications, yet many discrepancies can be found in these publications. Among these discrepancies are the size and the shape of the grains at the various zones, as well as the presence or non-presence of various zones at the vicinity of the weld. The current study contradicts the argument for correlations between the conditions prevailing at different points across the TMAZ and microstructural changes, which were previously proposed by several researchers. Full article
(This article belongs to the Special Issue Advances in Friction Stir Welding and Processing (2nd Edition))
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