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Mechanical Properties of Metals Welding Joints
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Mechanical Properties of Metals Welding Joints

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

Deadline for manuscript submissions: closed (30 November 2022) | Viewed by 7211

Special Issue Editors

Prof. Dr. Guoqing Gou

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, China
Interests: health assessment and management of welded structural parts ; mechanochemical material synthesis; metal materials; corrosion; detection of metal parts; 3D printing alloys
Special Issues, Collections and Topics in MDPI journals
Dr. Qing Zhang

E-Mail Website
Guest Editor
School of Physics, University of Electronic Science and Technology of China, Chengdu, China
Interests: metal materials; detection of metal parts; 3D printing alloys; two-dimensional materials; low dimensional composite metasurface; nanophotonics
Dr. Gongwen Gan

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, China
Interests: metal materials; corrosion; detection of metal parts; 3D printing alloys; antennas and antenna materials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Carbon neutral and peak carbon dioxide emissions are effective ways to solve the world’s increasingly complex climate and energy problems.  New materials, such as high-entropy alloys, new processing technologies, such as 3D printing, and online detection as well as monitoring technologies of new materials, such as online monitoring of corrosion defects of key engineering structures, are important paths to promote sustainable development. In this Special Issue, we will focus on basic theoretical research, simulation research, and experimental research of new materials, new processing technology, and application scenarios of materials. Important theoretical results and typical applications of important detection and monitoring technology of material service behavior should be given more attention.

Prof. Dr. Guoqing Gou
Dr. Qing Zhang
Dr. Gongwen Gan
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

  • residual stress
  • corrosion
  • fatigue
  • welding technology
  • ultrasonic test

Published Papers (5 papers)

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Research

11 pages, 5243 KiB  
Article
Vacuum Brazing and Performance Evaluation of T2 Copper Block and 316L Stainless Steel Tube
by Yu Wang, Qiao Shang, Jing Zeng, Ailin Hou, Xiaoxia Wang and Yafeng Wang
Metals 2023, 13(8), 1349; https://doi.org/10.3390/met13081349 - 27 Jul 2023
Viewed by 880
Abstract
The International Thermonuclear Experiment Reactor (ITER) Thermal shield (TS) serves as a cryogenic heat exchanger to maintain the thermal stability of the ITER superconducting magnet coil, which is critical to the control of the plasma during the operation of the ITER device. The [...] Read more.
The International Thermonuclear Experiment Reactor (ITER) Thermal shield (TS) serves as a cryogenic heat exchanger to maintain the thermal stability of the ITER superconducting magnet coil, which is critical to the control of the plasma during the operation of the ITER device. The TS is composed of long-length 316L stainless steel (SS) and copper as brazed joints. In this case, a feasible fabrication design for the CCS TS is presented, accomplished by three kinds of joining processes (vacuum brazing, friction stir weld, and TIG weld). In the reliable fabrication design, the brazing quality of the as-brazed long-distance 316L SS and copper joints plays a critical role in the thermal conductivity performance of the ITER thermal shield. Therefore, a high-quality vacuum brazing process of long-length SS/Cu joints applied in a low-temperature superconductor magnet system was first studied. The macro metallography analysis demonstrates the braze ratio of the samples is 100%, and no crack or defect is observed in the samples. The microstructural characterization reveals the brazing seams are composed of silver-based Ag-rich eutectic. The micro-shear test indicates that the shear strength of the 316L tube and copper joint is 205 MPa, with the fracture position located on the copper side; this zone will be the most vulnerable zone of the joints. In addition, the SEM results illustrated that the shear fracture morphology displayed a ductile fracture feature. The test results demonstrated that the highly precise depth drilling employed in this paper ensured a good control of the brazing clearance, resulting in a 100% braze ratio for the long-length SS/Cu joints. Therefore, it can be concluded that the brazing process can be applied in the ITER TS for the good thermal conductivity performance of long-length SS/Cu-brazing joints. Full article
(This article belongs to the Special Issue Mechanical Properties of Metals Welding Joints)
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13 pages, 6377 KiB  
Article
Study of Tensile Deformation and Damage Law in Undermatching X80 Pipeline Steel Welded Joints
by Yongbin Que, Yi Wu, Guanhua Wang, Haidong Jia, Shichao Zhang, Qingshan Feng and Lianshuang Dai
Metals 2023, 13(2), 226; https://doi.org/10.3390/met13020226 - 25 Jan 2023
Cited by 2 | Viewed by 1043
Abstract
This study used a digital imaging technique (DIC) to obtain the strain distribution at various locations in undermatching X80 pipe girth-weld joints under uniaxial tensile loading. In addition, the microstructure characteristics and deformation patterns in different regions were analyzed by scanning electron microscopy [...] Read more.
This study used a digital imaging technique (DIC) to obtain the strain distribution at various locations in undermatching X80 pipe girth-weld joints under uniaxial tensile loading. In addition, the microstructure characteristics and deformation patterns in different regions were analyzed by scanning electron microscopy (SEM). The results showed that there was strain heterogeneity between the various regions of the welded joint. Strain concentration existed only in the 12.8 mm base metal heat-affected zone (HAZ) and only in the elastic deformation stage. There was strain concentration in the weld metal (WM) and both sides of the HAZ close to the near-fracture stage, and the maximum deformation was in the WM. When εM = 12.2%, the KC was 6.27 and the KF was 1.73, and the KF was 113% and 152% of the KC and the KG, respectively. The large number of slip strips generated indicated serious damage in the WM near the fracture stage. In the elastic deformation stage, the strain concentration of the N1 HAZ was caused by the softened ferrite. The maximum deformation of the WM near the fracture stage was caused by the large grain size and the non-uniform martensite–austenite (M–A) islands, which may also lead to better local toughness of the cover weld and further affect the fracture mechanism of the welded joint. Full article
(This article belongs to the Special Issue Mechanical Properties of Metals Welding Joints)
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14 pages, 7027 KiB  
Article
Ultrasonic Correction Measurement for Residual Stress in 5083 Aluminum Alloy Welded Component of High-Speed Train
by Mocheng Guo, Guoqing Gou, Bing Chen, Feifei Qiu, Zhongyin Zhu, Junjun Jin, Xiangyang Wu, Wei Gao and Songling Sun
Metals 2023, 13(1), 137; https://doi.org/10.3390/met13010137 - 10 Jan 2023
Cited by 1 | Viewed by 1414
Abstract
The measurement and control of residual stresses are crucial to the structural safety of high-speed trains. The critical refraction longitudinal wave method is extensively employed for the residual stress measurement, and the correction of the influencing factors is the key to the detection [...] Read more.
The measurement and control of residual stresses are crucial to the structural safety of high-speed trains. The critical refraction longitudinal wave method is extensively employed for the residual stress measurement, and the correction of the influencing factors is the key to the detection accuracy. However, the existing methods mostly give purely mathematical expressions which are only applicable to their studied materials. Hence, this paper proposes the specific influence factor correction method to enhance the applicability and accuracy, and the 5083 aluminum alloy welded component is utilized for testing. Subsequently, the stress coefficient K and the compensation acoustic time under the influence of internal factors are obtained by employing the proposed method, combined with the simulation to determine the focused detection zone, the hole-drilling and X-ray methods are utilized for comparisons, and the results indicate that the test data have a good coincidence. Meanwhile, the detection errors of each zone before and after the correction are analyzed. Moreover, combined with the experimental verification, it is found that the penetration depth of a critical refraction longitudinal wave approaches its one wavelength; the corresponding study is conducted with this characteristic and concludes that in the weld zone, the longitudinal residual stresses are mainly concentrated on the surface of the measured material. Finally, the above results indicate that the proposed method can provide more accurate measurements for engineering applications. Full article
(This article belongs to the Special Issue Mechanical Properties of Metals Welding Joints)
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15 pages, 5739 KiB  
Article
Relieving Residual Stress of 316L Stainless Steel by Acoustic/Thermal Composite Treatment
by Pengyu Xiang, Chenhao Zhang, Junjun Jin, Zhongyin Zhu and Guoqing Gou
Metals 2023, 13(1), 18; https://doi.org/10.3390/met13010018 - 22 Dec 2022
Viewed by 1592
Abstract
The influence of temperature, vibration time, amplitude, and other factors on the residual stress release effect was studied using the method of low-temperature heating and high-frequency ultrasonic vibration, and excellent control parameters were obtained. In addition, the influence of cutting weld reinforcement on [...] Read more.
The influence of temperature, vibration time, amplitude, and other factors on the residual stress release effect was studied using the method of low-temperature heating and high-frequency ultrasonic vibration, and excellent control parameters were obtained. In addition, the influence of cutting weld reinforcement on the residual stress release was also studied. The results demonstrate that the highest relative residual stress release rate was 280.29%, the average release was over 150 MPa, and the efficiency was higher than that of the general stress release methods. After cutting the reinforcement, only a small part of residual stress was released, influencing the overall residual stress distribution relatively little. The experimental material was a butt-welded 316L stainless steel plate μ-X360s diffractometer, and this was used for measuring the residual stress. Full article
(This article belongs to the Special Issue Mechanical Properties of Metals Welding Joints)
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12 pages, 6416 KiB  
Article
Structure, Mechanical Properties and Friction Characteristics of the Al-Mg-Sc Alloy Modified by Friction Stir Processing with the Mo Powder Addition
by Tatiana Kalashnikova, Evgeny Knyazhev, Denis Gurianov, Andrey Chumaevskii, Andrey Vorontsov, Kirill Kalashnikov, Natalya Teryukalova and Evgeny Kolubaev
Metals 2022, 12(6), 1015; https://doi.org/10.3390/met12061015 - 15 Jun 2022
Cited by 4 | Viewed by 1786
Abstract
In this study, samples of Al-Mg-Sc alloy were investigated after friction stir processing with the addition of Mo powder. Holes were drilled into 5 mm-thick aluminum alloy sheets into which Mo powder was added at percentages of 5, 10, and 15 wt%. The [...] Read more.
In this study, samples of Al-Mg-Sc alloy were investigated after friction stir processing with the addition of Mo powder. Holes were drilled into 5 mm-thick aluminum alloy sheets into which Mo powder was added at percentages of 5, 10, and 15 wt%. The workpieces with different powder contents were then subjected to four passes of friction stir processing. Studies have shown that at least three tool passes are necessary and sufficient for a uniform Mo powder distribution in the stir zone, but the number of required passes is higher with an increase in the Mo content. Due to the temperature specifics of the processing, no intermetallic compounds are formed in the stir zone, and Mo is distributed as separate particles of different sizes. The average ultimate strength of the composite materials after four passes is approximately 387 MPa in the stir zone, and the relative elongation of the material changes from 15 to 24%. The dry sliding friction test showed that the friction coefficient of the material decreases with the addition of 5 wt% Mo, but with a further increase in Mo content, returns to the original material values. Full article
(This article belongs to the Special Issue Mechanical Properties of Metals Welding Joints)
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