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Metals
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Studies on Underwater Welding of Metallic Materials
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Studies on Underwater Welding of Metallic Materials

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

Deadline for manuscript submissions: closed (31 March 2024) | Viewed by 3727

Special Issue Editors

Dr. Jianfeng Wang

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Guest Editor
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
Interests: welding and processing; laser welding; ultrasonic vibration/magnetic field-assisted welding
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Dariusz Fydrych

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Guest Editor
Institute of Manufacturing and Materials Technology, Faculty of Mechanical Engineering and Ship Technology, Gdańsk University of Technology, ul. Narutowicza 11/12, 80-233, Gdańsk, Poland
Interests: underwater welding; friction stir welding; dissimilar welded joints; diffusible hydrogen; weldability tests
Special Issues, Collections and Topics in MDPI journals
Dr. Hongliang Li

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China
Interests: underwater welding; welding consumables; microstructure characterization
Dr. Hao Chen

E-Mail Website
Guest Editor
School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China
Interests: underwater welding; arc additive manufacturing; metal and heat transfer; corrosion; microstructure and property; weld formation

Special Issue Information

Dear Colleagues,

Offshore development has accelerated in recent years owing to the fact that more than 50% of undeveloped petroleum deposits are located under the ocean. Oil and gas are being pursued at greater depths underwater than ever before. Underwater wet welds suitable for structural repairs have been produced under water and high radiation areas of nuclear power plants. Underwater repairs on higher strength steels require additional precautions to avoid weld defects induced by rapid cooling appearing in underwater welding. With the current trends of increasing offshore development and the use of higher strength steels, the demand for underwater welding processes that can produce quality wet welds at greater depths, and on a variety of materials, will continue to increase.

This Special Issue on “Studies on Underwater Welding of Metallic Materials” will collect the latest contributions regarding the application of underwater welding technology to similar and dissimilar metals, such as higher-strength steels, stainless steels, titanium alloys, etc. We are inviting researchers to contribute manuscripts presenting the latest underwater welding findings using experimental analysis, numerical simulation, and intelligent algorithms. The latest findings regarding underwater welding repairing, underwater processing, and underwater additive manufacturing are also welcome, provided that the technology derived from underwater welding can be used for marine structure metals.

Dr. Jianfeng Wang
Prof. Dr. Dariusz Fydrych
Dr. Hongliang Li
Dr. Hao Chen
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

  • underwater welding technology
  • underwater welding repairing
  • welding of similar and dissimilar metals
  • marine structure metals
  • experimental analysis
  • numerical simulation

Published Papers (3 papers)

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Research

11 pages, 4888 KiB  
Article
Study on Reactive Air Brazing of p-SiO2 Ceramic with Ag-xCuO Filler Metal
by Yongwei Chen, Qiang Ma and Peng He
Metals 2023, 13(9), 1561; https://0-doi-org.brum.beds.ac.uk/10.3390/met13091561 - 06 Sep 2023
Viewed by 595
Abstract
Reactive air brazing of porous SiO2 ceramic (p-SiO2) was achieved using Ag-CuO filler metal. When brazing p-SiO2, two main problems existed. Firstly, the wettability of the Ag filler metal on the surface of p-SiO2 was poor. Secondly, [...] Read more.
Reactive air brazing of porous SiO2 ceramic (p-SiO2) was achieved using Ag-CuO filler metal. When brazing p-SiO2, two main problems existed. Firstly, the wettability of the Ag filler metal on the surface of p-SiO2 was poor. Secondly, the residual stress caused by the mismatch of the coefficient of thermal expansion was high in the joint. In order to solve these problems, the effects of CuO contents on the p-SiO2 brazed joint were analyzed. In a wetting experiment, the addition of CuO significantly improved the wettability of the Ag-CuO/p-SiO2 system. With the content of CuO increasing, the contact angle decreased from 90° to 0°. In addition, when the content of CuO increased to 0.5 mol%, the contact angle decreased from 90° to 52°. Then, during brazing p-SiO2 with the Ag-xCuO filler metal, the typical interfacial microstructure of the joints brazed at 1000 °C for 30 min was p-SiO2 ceramic/Ag (s,s) + SiO2 + CuO/Ag (s,s)/Ag (s,s) + SiO2 + CuO/p-SiO2 ceramic. Meanwhile, Ag-CuO infiltrated into the p-SiO2 ceramic and an infiltration layer formed. The infiltration layer was composed of Ag (s,s) + SiO2 + CuO and the infiltration layer was conductive to form a good gradient transition of the coefficient of thermal expansion (CTE). Then, the residual stress in the joint was released and the shear strength improved. In addition, with the content of CuO increasing, the depth of the infiltration layer increased. Furthermore, when the content of CuO was 0.5 mol%, the maximum shear strength of the joint was 55 MPa. Full article
(This article belongs to the Special Issue Studies on Underwater Welding of Metallic Materials)
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18 pages, 6419 KiB  
Article
The Efficiency of Thermite-Assisted Underwater Wet Flux-Cored Arc Welding Process: Electrical Dependence, Microstructural Changes, and Mechanical Properties
by Jibo Wang, Hongliang Li, Chengyu Hu, Zeyu Wang, Ke Han, Duo Liu, Jianfeng Wang and Qiang Zhu
Metals 2023, 13(5), 831; https://0-doi-org.brum.beds.ac.uk/10.3390/met13050831 - 23 Apr 2023
Cited by 5 | Viewed by 1339
Abstract
Alumino-thermic additions to the flux-cored wire can be utilized to enhance welding heat input, improve welding productivity, and minimize the dependency on power sources in the air environment. In this article, the influence of Al/Fe2O3 thermite on electrical dependency, microstructural [...] Read more.
Alumino-thermic additions to the flux-cored wire can be utilized to enhance welding heat input, improve welding productivity, and minimize the dependency on power sources in the air environment. In this article, the influence of Al/Fe2O3 thermite on electrical dependency, microstructural characteristics, and mechanical performance during the underwater wet welding of Q235 steel was investigated. The results revealed that adding exothermic flux enhanced the underwater wet welding appearance. The basicity of the slag steadily decreased from 1.77 to 0.73 because of the formation of Al2O3. Thermite increased the quantity and diameter of inclusions in the underwater wet weld metal. The excessive addition of Al/Fe2O3 thermite resulted in agglomerated inclusions in the weld metal. Significant microstructural changes from grain boundary ferrite to acicular ferrite were mainly caused by the de-oxidation products of the thermite process. When thermite was added to the flux-cored wire, the ultimate tensile strength first increased and then decreased, while the microhardness of the underwater wet welds showed an obviously increasing trend. The addition of exothermic flux additions to the flux-cored wire can help generate chemical heat and increase the energy required to melt the wire. This study established a link between thermite addition and joint performance, paving the way for the development and application of thermite-assisted self-shielded flux-cored wire. Full article
(This article belongs to the Special Issue Studies on Underwater Welding of Metallic Materials)
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14 pages, 7627 KiB  
Article
Effect of Material Inhomogeneity on the Crack Tip Mechanical Field and SCC Growth Rate of 52M/316L Dissimilar Metal Welded Joints
by Kuan Zhao, Bangwen Wang, He Xue and Zheng Wang
Metals 2022, 12(10), 1683; https://0-doi-org.brum.beds.ac.uk/10.3390/met12101683 - 09 Oct 2022
Cited by 1 | Viewed by 1023
Abstract
The stress–strain conditions at the crack tip in dissimilar metal welded joints (DMWJ) are a critical factor influencing stress corrosion cracking (SCC) behavior. The processing technology and working environment of DMWJ lead to a randomly inhomogeneous distribution of material mechanical properties, making the [...] Read more.
The stress–strain conditions at the crack tip in dissimilar metal welded joints (DMWJ) are a critical factor influencing stress corrosion cracking (SCC) behavior. The processing technology and working environment of DMWJ lead to a randomly inhomogeneous distribution of material mechanical properties, making the crack tip mechanical field more complex. An inhomogeneous model was obtained using a combination of physical experiments and the elastic–plastic finite element method to understand the effect of this inhomogeneous distribution of mechanical properties on the direction of SCC growth and the growth rate in DMWJ and the impact of inhomogeneity on the SCC growth behavior was compared and analyzed. The findings demonstrate that Type I (opening mode) cracks are more likely to form due to the inhomogeneity of mechanical properties and are more likely to deflect toward the Alloy 52M region at the interface between Alloy 52M and 316L stainless steel. Additionally, the strain gradient at the crack tip increases with the degree of inhomogeneity, which has a bigger impact on the accuracy of SCC growth rate predictions. Full article
(This article belongs to the Special Issue Studies on Underwater Welding of Metallic Materials)
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