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Metals
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Editorial Board Members’ Collection Series: “Welding and Joining”
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Editorial Board Members’ Collection Series: “Welding and Joining”

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Welding and Joining".

Deadline for manuscript submissions: 30 June 2025 | Viewed by 2710

Special Issue Editors

Dr. Guido Di Bella

E-Mail Website
Guest Editor
Department of Engineering, University of Messina, Contrada di Dio 1, 98166 Messina, Italy
Interests: additive manufacturing; joining; dissimilar materials; composites; FEA
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. António Bastos Pereira

E-Mail Website1 Website2
Guest Editor
Centre for Mechanical Technology and Automation, University of Aveiro, Campus Santiago, 3810-193 Aveiro, Portugal
Interests: adhesive joints; adhesive strength; mechanical testing; manufacturing processes
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues

This Special Issue, “Editorial Board Members’ Collection Series: Welding and Joining”, aims to gather cutting-edge research and innovative developments in the field of welding and joining technologies. This collection includes diverse studies conducted by leading experts, providing an overview of the latest techniques and applications in the field. Topics covered include advanced welding techniques such as friction stir welding, explosion welding, and clinching, as well as bonding with structural adhesives. This Special Issue also addresses critical issues such as fracture mechanisms, mechanical resistance in aggressive environments, and methodologies for defect detection and prevention.

Particular attention is paid to process optimization and material characterization, focusing on the assessment of mechanical properties and the long-term reliability of joints. Another highly relevant topic is numerical modeling using finite element analysis software, which enables the accurate simulation of welding and joining processes, predicting the structural behavior and performance of joints under various operating conditions.

By exploring both theoretical and practical approaches, this collection represents an indispensable resource for researchers, engineers, and professionals in the field, facilitating the understanding of current dynamics and future directions in material joining technologies. The importance of these technologies is highlighted in various industrial applications, including aerospace, automotive, construction, and manufacturing, emphasizing the crucial role of mechanical resistance and joint durability in severe operating conditions.

Dr. Guido Di Bella
Prof. Dr. António Bastos Pereira
Guest Editors

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

  • advanced welding techniques
  • welding
  • structural bonding
  • mechanical joining
  • fracture mechanisms
  • finite element modeling
  • resistance in aggressive environments

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Further information on MDPI's Special Issue policies can be found here.

Published Papers (4 papers)

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Research

16 pages, 7169 KiB  
Article
Prediction and Prevention of Edge Waves in Continuous Cold Forming of Thick-Wall High-Strength Welded Pipe
by Shengde Hu, Junhao Zhao and Yu Liu
Metals 2025, 15(4), 455; https://doi.org/10.3390/met15040455 - 18 Apr 2025
Viewed by 211
Abstract
In order to reduce the edge waves and defects of the strip in the forming process and obtain better properties of the strip, it is urgent to establish a better flexible cold forming process. In this paper, a finite element model of the [...] Read more.
In order to reduce the edge waves and defects of the strip in the forming process and obtain better properties of the strip, it is urgent to establish a better flexible cold forming process. In this paper, a finite element model of the production line was established to simulate the forming process, and the effective stress distribution at the corner of the strip was simulated. The effect of cold working hardening was basically consistent with that calculated by the analytical method and tensile test results. A mathematical model of the maximum normal strain along the tangent direction of the strip’s outer edge of each pass was established. With the constraint conditions that the maximum value of the normal strain value of each pass is less than the critical value and the upper and lower limit of the horizontal value of each test factor, and the maximum value of the normal strain of each pass as the goal, the number of cold forming passes, the bending angle of each pass and the working roll diameter of the roll have been determined. The optimized process parameters were used in the simulations. No edge wave at the strip edge and no “Bauschinger effect” in forming before high-frequency induction welding was found. The method proposed in this paper can optimize the key process parameters before the production line is put into operation, minimize the possible buckling of the strip edge during the forming process, and reduce the possible loss caused by design defects. Full article
(This article belongs to the Special Issue Editorial Board Members’ Collection Series: “Welding and Joining”)
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15 pages, 19069 KiB  
Article
Effect of Deep Cryogenic Treatment on Microstructure and Mechanical Properties of Friction Stir Welded TRIP590 Steel Joints
by Yashuai Hu, Weidong Liu, Liguo Wang, Yufeng Sun, Wenbo Cao and Shaokang Guan
Metals 2025, 15(3), 298; https://doi.org/10.3390/met15030298 - 9 Mar 2025
Viewed by 490
Abstract
In this study, friction stir welding was first applied to the 1.4 mm thick TRIP590 steel sheets at a constant transverse speed of 100 mm/min and different rotation speeds from 200 to 500 rpm. Then, the obtained joints received deep cryogenic treatment in [...] Read more.
In this study, friction stir welding was first applied to the 1.4 mm thick TRIP590 steel sheets at a constant transverse speed of 100 mm/min and different rotation speeds from 200 to 500 rpm. Then, the obtained joints received deep cryogenic treatment in liquid nitrogen for 24 and 48 h, respectively. It was revealed that the content of retained austenite in the stir zone of the welded joints decreased from 3.3% to 0.2% when the rotation speed increased from 200 rpm to 500 rpm. The stability of retained austenite increased due to grain refinement and work hardening at low rotation speeds. After deep cryogenic treatment of the welded joints, the retained austenite in the stir zone partially transformed into martensite, which led to the precipitation of nano-sized carbide in the ferrite matrix and the release of local stress. As a result, both the strength and plasticity of the stir zone after 48 h of deep cryogenic treatment increased from 798 MPa, 15% to 927 MPa, 17% for the 200 rpm joint, and from 914 MPa, 14% to 1086 MPa, 16% for the 300 rpm joint during the tensile tests. Full article
(This article belongs to the Special Issue Editorial Board Members’ Collection Series: “Welding and Joining”)
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18 pages, 18717 KiB  
Article
Processing of Eddy Current Infrared Thermography and Magneto-Optical Imaging for Detecting Laser Welding Defects
by Pengyu Gao, Xin Yan, Jinpeng He, Haojun Yang, Xindu Chen and Xiangdong Gao
Metals 2025, 15(2), 119; https://doi.org/10.3390/met15020119 - 25 Jan 2025
Cited by 1 | Viewed by 707
Abstract
Infrared (IR) magneto-optical (MO) bi-imaging is an innovative method for detecting weld defects, and it is important to process both IR thermography and MO imaging characteristics of weld defects. IR thermography and MO imaging can not only run simultaneously but can also run [...] Read more.
Infrared (IR) magneto-optical (MO) bi-imaging is an innovative method for detecting weld defects, and it is important to process both IR thermography and MO imaging characteristics of weld defects. IR thermography and MO imaging can not only run simultaneously but can also run separately in special welding processes. This paper studies the sensing processing of eddy current IR thermography and MO imaging for detecting weld defects of laser spot welding and butt joint laser welding, respectively. To address the issues of high-level noise and low contrast in eddy current IR detection thermal images interfering with defect detection and recognition, a method based on least squares and Gaussian-adaptive bilateral filtering is proposed for denoising eddy current IR detection thermal images of laser spot welding cracks and improving the quality of eddy current IR detection thermal images. Meanwhile, the image gradient is processed by Gaussian-adaptive bilateral filtering, and then the filter is embedded in the least squares model to smooth and denoise the image while preserving defect information. Additionally, MO imaging for butt joint laser welding defects is researched. For the acquired MO images of welding cracks, pits, incomplete fusions, burn-outs, and weld bumps, the MO image processing method that includes median filtering, histogram equalization, and Wiener filtering was used, which could eliminate the noise in an image, enhance its contrast, and highlight the weld defect features. The experimental results show that the proposed image processing method can eliminate most of the noise while retaining the weld defect features, and the contrast between the welding defect area and the normal area is greatly improved. The denoising effect using the Natural Image Quality Evaluator (NIQE) and the Blind Image Quality Index (BIQI) has been evaluated, further demonstrating the effectiveness of the proposed method. The differences among weld defects could be obtained by analyzing the gray values of the weld defect MO images, which reflect the weld defect information. The MO imaging method can be used to investigate the magnetic distribution characteristics of welding defects, and its effectiveness has been verified by detecting various butt joint laser welding weldments. Full article
(This article belongs to the Special Issue Editorial Board Members’ Collection Series: “Welding and Joining”)
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17 pages, 8133 KiB  
Article
Effect of Surface Treatment on Tensile Strength of Steel Single Lap Joints Bonded with Double-Sided Acrylic Foam Tapes for Naval Applications
by Guido Di Bella, Mohamed Chairi, Antonio Denaro and Adriano Bado
Metals 2024, 14(9), 1071; https://doi.org/10.3390/met14091071 - 18 Sep 2024
Viewed by 877
Abstract
This study investigated single lap joints in steel used for naval carpentry. The surface was mechanically treated, and then a double-sided acrylic foam tape was applied with varying surface preparation conditions. Specifically, three different conditions were examined. Tensile tests revealed that changing the [...] Read more.
This study investigated single lap joints in steel used for naval carpentry. The surface was mechanically treated, and then a double-sided acrylic foam tape was applied with varying surface preparation conditions. Specifically, three different conditions were examined. Tensile tests revealed that changing the type of surface preparation significantly affects the mechanical strength of the joints. The best mechanical properties were achieved when a primer was used. Our results demonstrate that this method can be effectively employed in naval applications as an alternative to welding for non-structural applications, such as the installation of brackets for mounting electrical devices (e.g., sockets). Full article
(This article belongs to the Special Issue Editorial Board Members’ Collection Series: “Welding and Joining”)
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