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Welding and Joining Technologies: Processes, Parameters, Structures, Properties and Simulations
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Welding and Joining Technologies: Processes, Parameters, Structures, Properties and Simulations

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Materials Physics".

Deadline for manuscript submissions: 20 August 2024 | Viewed by 3337

Special Issue Editors

Dr. Xianjun Pei

E-Mail Website
Guest Editor
School of Mechanical Engineering, Southeast University, Nanjing 211189, China
Interests: fatigue and fracture; welding and joining; structural integrity; residual stress; computational method; mechanics of welded structures
Special Issues, Collections and Topics in MDPI journals
Dr. Haibo Yang

E-Mail Website1 Website2
Guest Editor
1. College of Water Conservancy and Civil Engineering, Shandong Agricultural University, Taian, China
2. School of Ocean Engineering, Harbin Institute of Technology at Weihai, Weihai 264200, China
Interests: fatigue performance analysis of welded structures; multiaxial stress state; fatigue lifetime prediction; fatigue crack initiation and propagation; traction structural stress method
Special Issues, Collections and Topics in MDPI journals
Dr. Yong Liu

E-Mail Website
Guest Editor
School of Ocean Engineering, Harbin Institute of Technology at Weihai, Weihai 264200, China
Interests: welding and joining processes; computational welding mechanics; residual stress; welding distortion prevention; fatigue and fracture of welded structures

Special Issue Information

Dear Colleagues,

We are pleased to announce the launch of a Special Issue on "Welding and Joining Technologies: Processes, Parameters, Structures, Properties and Simulations" in Materials. This Special Issue aims to provide a platform for scientists and academicians to share their latest research findings on and insights into various aspects of welding and joining technologies.

Scope of submissions: The Special Issue invites original research articles, review papers, and case studies that contribute to the advancement of knowledge in the fields of welding and joining. The topics of interest include, but are not limited to, the following:

  1. Welding processes: Arc welding, resistance welding, laser welding, electron beam welding, etc.
  2. Joining techniques: Adhesive bonding, mechanical fastening, soldering, brazing, etc.
  3. Parameter optimization: Investigation and optimization of welding and joining parameters for improved performance and efficiency.
  4. Structures and properties: Characterization and evaluation of welded as well as joined structures and their mechanical, thermal, and corrosion properties.
  5. Simulation and modeling: Development and application of simulation and modeling techniques for predicting as well as analyzing welding and joining processes and their outcomes.
  6. Emerging trends and technologies: Innovative approaches, materials, and technologies in welding and joining.

We look forward to your contributions and believe that this Special Issue will significantly contribute to the advancement of welding and joining technologies. Should you have any inquiries, please do not hesitate to contact the Editorial Office.

Sincerely,

Dr. Xianjun Pei
Dr. Haibo Yang
Dr. Yong Liu
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. Materials is an international peer-reviewed open access semimonthly 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

  • welding and joining
  • welding metallurgy
  • weldability
  • residual stress
  • computational method
  • mechanics of welded structures
  • parameter optimization
  • fatigue and fracture
  • structural integrity

Published Papers (4 papers)

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Research

19 pages, 9395 KiB  
Article
Microstructure and Mechanical Properties of High-Strength AA6011 Aluminum Alloy Welding with Novel 4xxx Filler Metals
by Mohamed Ahmed, Mousa Javidani, Alexandre Maltais and X.-Grant Chen
Materials 2024, 17(2), 380; https://doi.org/10.3390/ma17020380 - 12 Jan 2024
Viewed by 611
Abstract
Welding high-strength 6xxx aluminum alloys using a commercial ER4043 filler often results in inferior joint strength. This study investigated the effects of newly developed Al-Si-Mg filler metals with varying Mg (0.6–1.4 wt.%) and Mn (0.25–0.5 wt.%) contents on the microstructure evolution and mechanical [...] Read more.
Welding high-strength 6xxx aluminum alloys using a commercial ER4043 filler often results in inferior joint strength. This study investigated the effects of newly developed Al-Si-Mg filler metals with varying Mg (0.6–1.4 wt.%) and Mn (0.25–0.5 wt.%) contents on the microstructure evolution and mechanical performance of high-strength AA6011-T6 plates using gas metal arc welding. Two commercial fillers, ER4043 and ER4943, were used as references for comparison. The results revealed that increasing the Mg and Mn contents in the novel fillers resulted in sufficiently high alloying elements in the fusion zone (FZ), leading to higher microhardness. Under as-welded conditions, the weakest region of the joint was the heat-affected zone (HAZ). The joint strength was almost independent of the filler type and was controlled by the HAZ strength, measuring a UTS of 230 and 241 MPa for ER4043 and the other joints, respectively. The higher Mg contents in the novel fillers promoted the precipitation of a large volume fraction of fine β″-MgSi in the FZ during post-weld heat treatment (PWHT), resulting in superior strength and higher welding efficiency relative to the reference fillers. The optimal Mg content of the novel fillers was 0.6 wt.%. Increasing the Mn content of the filler metal had an insignificant effect. The FMg0.6 filler with 0.6% Mg achieved the best combination of strength (UTS of 410 MPa) and elongation (6.7%) as well as the highest welding efficiency (94%) after PWHT, among all of the fillers studied. However, the newly developed fillers adversely affected the impact toughness of the joints. Full article
(This article belongs to the Special Issue Welding and Joining Technologies: Processes, Parameters, Structures, Properties and Simulations)
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17 pages, 7743 KiB  
Article
Application of New Al-Si Welding Filler with High Concentration of Copper and Magnesium: High-Temperature Strength and Anti-Corrosion Mechanism
by Jun-Ren Zhao, Fei-Yi Hung and Chien-Yu Pan
Materials 2024, 17(1), 126; https://doi.org/10.3390/ma17010126 - 26 Dec 2023
Viewed by 633
Abstract
Currently, the primary commercial aluminum alloy fillers used are 4043 and 5356. However, when welded with high-strength work pieces like 6061 and 7075 aluminum alloys, the strength of weld beads significantly lags behind that of the original welded material. Both 4043 and 5356 [...] Read more.
Currently, the primary commercial aluminum alloy fillers used are 4043 and 5356. However, when welded with high-strength work pieces like 6061 and 7075 aluminum alloys, the strength of weld beads significantly lags behind that of the original welded material. Both 4043 and 5356 aluminum alloys cannot be strengthened through heat treatment. The strength difference between the weld bead and base material doubles after heat treatment. In this study, an Al-Si-Cu-Mg alloy (SCM) filler modified using a heat-treatable A319 aluminum alloy was employed to investigate the post-welding microstructural and mechanical properties of specimens under room- and high-temperature conditions and after prolonged exposure in a saltwater environment (3.5 wt.% NaCl). The aim was to demonstrate that commercial aluminum alloy fillers could be substituted with a high-silicon aluminum alloy boasting excellent solidification and mechanical properties. The results revealed that, after heat treatment of the weld bead, dendrites were not eliminated, but the tensile strength increased to 310 MPa, closely matching that of commercial 6061 aluminum alloy. The strength of the weld bead remained higher than 250 MPa in high-temperature (240 °C) and saltwater environments. These findings underscore the potential application of this material. Full article
(This article belongs to the Special Issue Welding and Joining Technologies: Processes, Parameters, Structures, Properties and Simulations)
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17 pages, 8284 KiB  
Article
Study on Fatigue Performance of Pulsed Tungsten Inert Gas Welding Joint of Duplex Stainless Steel Thin Tube
by Chaofei Yang, Wenjian Zheng, Renfu Wang, Jiajia Niu, Lei Sun, Mao Cheng, Xianjing Lu, Zhou Zhou and Jianguo Yang
Materials 2024, 17(1), 109; https://doi.org/10.3390/ma17010109 - 25 Dec 2023
Viewed by 684
Abstract
To solve the shortage of austenite phase precipitation caused by nitrogen loss in the welding process of UNS S2205 duplex stainless steel (DSS), shielding gas nitriding was investigated by adding different N2 contents in Ar shielding gas during the welding process. A [...] Read more.
To solve the shortage of austenite phase precipitation caused by nitrogen loss in the welding process of UNS S2205 duplex stainless steel (DSS), shielding gas nitriding was investigated by adding different N2 contents in Ar shielding gas during the welding process. A good thin-walled pipe butt joint was formed using the pulsed tungsten inert gas (P-TIG) welding method with Ar-N2 shielding gas. High cycle fatigue tests of the weld joints were conducted to study the effect of shielding gas nitriding on the fatigue properties. Fatigue tests at three stress levels of 225 MPa, 270 MPa, and 360 MPa were carried out on the weld joints with different N2 contents, and the fatigue samples were all fractured in the high temperature heat-affected zone (H-HAZ). Within the current process parameters, the fatigue life of the 4 vol.% N2 welded joints was optimal. Fatigue striations appeared in the fatigue crack propagation zone, and the transient fracture zone was similar to the tensile fracture. Under the low-stress level, the area of the crack propagation zone under 4 vol.% N2 was the highest, the tear ridges all expanded around the crack source area, and the fatigue crack propagation zone presented a radial distribution. The proliferation and expansion of dislocations were mainly carried out in the austenite grains, and the dislocation density of the fatigue specimens under 4 vol.% N2 was smaller than that of the Ar specimens. Shielding gas nitriding effectively improved the balance of the two-phase ratio and the hardness of austenite phase, optimized the internal slip system, inhibited the proliferation of dislocations in the austenite phase, and improved the fatigue life of weld joints. Full article
(This article belongs to the Special Issue Welding and Joining Technologies: Processes, Parameters, Structures, Properties and Simulations)
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19 pages, 19022 KiB  
Article
Fatigue Performance Analysis of Welded T-Joints in Orthotropic Steel Bridge Decks with Ultrasonic Impact Treatment
by Yizhou Liu, Wenhua Huang, Banhai Yu, Zhihao Chen and Ping Wang
Materials 2023, 16(18), 6196; https://doi.org/10.3390/ma16186196 - 13 Sep 2023
Viewed by 731
Abstract
This study aims to assess the effect of ultrasonic impact treatment (UIT) on the exterior weld seam of S355J2 T-joints used in orthotropic steel bridge decks. The microstructure and mechanical behavior of T-joints after UIT was investigated in this study. Fatigue tests of [...] Read more.
This study aims to assess the effect of ultrasonic impact treatment (UIT) on the exterior weld seam of S355J2 T-joints used in orthotropic steel bridge decks. The microstructure and mechanical behavior of T-joints after UIT was investigated in this study. Fatigue tests of T-joints before and after UIT were performed. The stress concentration at the interior and exterior weld toe of T-joints was considered using the traction structural stress method. The results showed that hardness increases by 10% due to the localized grain refinement caused by UIT. UIT significantly improves the fatigue life of T-joint specimens by 350% and 150% at stress ratios of 0.1 and 0.3, respectively. As the transition angle between the weld profile and the base metal profile increases, the stress concentration factor decreases. Full article
(This article belongs to the Special Issue Welding and Joining Technologies: Processes, Parameters, Structures, Properties and Simulations)
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