Article
Multidisciplinary Sciences
David Curiel, Fernando Veiga, Alfredo Suarez, Pedro Villanueva, Eider Aldalur
Summary: The field of inspection for welded structures is going through rapid transformation due to global technological, regulatory, and economic factors. This transformation is driven by the introduction of new materials and welding processes, advancements in inspection technologies, innovative approaches to weld acceptance code and certification procedures, demands for cost-effectiveness and quality, and the need to extend aging structures' lifespan.
Article
Automation & Control Systems
Mao Ni, Xunpeng Qin, Zeqi Hu, Feilong Ji, Shiming Yang, Shuxin Wang
Summary: This study investigated the weld forming characteristics and control methods of GMAW-based additive manufacturing on curved surfaces, establishing a computational model and conducting deposition experiments to verify the findings. Results showed that the weld height and width varied with the tilt angle, and a weave welding method was proposed to control hump defects by reducing gravity component and improving molten pool flow stability. The dimensional deviations between downward and upward welding were within 7%, making it acceptable for GMAW-based additive manufacturing process.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Guoqiang Liu, Xinhua Tang, Qi Xu, Fenggui Lu, Haichao Cui
Summary: By adding small amounts of active gases CO2 and O-2 into pure argon shielding gas, this study improved the weld formation of pulsed-current narrow-gap gas metal arc welding (NG-GMAW) of mild steel. Both CO2 and O-2 were found to stabilize the arc and welding process, with O-2 being more effective but more likely to cause slag on the weld surface. The addition of active gases significantly influenced the weld bead appearance, but had little impact on weld width and penetration.
CHINESE JOURNAL OF MECHANICAL ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Hwi Jun Son, Young Cheol Jeong, Bo Wook Seo, Sung-Tae Hong, Yu-Chan Kim, Young Tae Cho
Summary: Researchers conducted experiments on high-hardness armor steel plates using different welding methods to reduce the weight of combat vehicles and enhance bulletproof performance and durability. The results showed that the mechanical strength of the welded zone and the integrity of the welding process deteriorated as the CO2 content and heat input increased.
Article
Automation & Control Systems
Yue Cao, Zhijiang Wang, Shengsun Hu, Tao Wang
Summary: The control of backside weld width in GMAW-P is achieved by utilizing two electrical characteristic signals as feedback. The GMAW-P process is adjusted by changing the parameters of the base current period, while the backside weld width is measured during the peak current period. The two characteristic signals, namely the relative change in arc voltage and the average arc voltage during the peak current period, are used as sensing signals and exhibit negative linear relationships with backside weld width. The control system and adaptive predictive controller are designed and validated for real-time control.
IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Tie Yin, Hai-Cheng Jin, Hong Zhao, Qian Zhang
Summary: In this study, a ternary shielding gas (Ar-CO2-O2) was used to improve the weld formation of all-position narrow gap welding of pipelines. Results showed that compared to the binary shielding gas, the ternary shielding gas led to better weld formation, weld width, and weld penetration, with an increase in weld penetration depth by 20% to reduce the lack of fusion.
SCIENCE OF ADVANCED MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Yu Hu, Jiaxiang Xue
Summary: To address the defects of high-speed pulsed GMAW, an improved twin-wire GMAW welding process was proposed by introducing additional shielding gas to impact the molten pool. The effects of different shielding gas flowrates on the mechanical properties and microstructure of the welded seams were investigated. The results showed that an optimal tensile strength was achieved under a flowrate of 12 L/min.
Article
Automation & Control Systems
Aitor Zalakain-Azpiroz, Nieves Rodriguez, Aitor Garcia de la Yedra, Joaquin Piccini, Xabier Angulo-Vinuesa
Summary: Monitoring and assessing weld quality in industrial robotic arc welding processes is crucial to ensure the suitability of components for their intended applications, with weld penetration depth being a major fabrication requirement. Multiple sensor approaches have been developed to overcome physical challenges and accessibility restrictions, enabling instantaneous depth evaluation and online usage.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Rajneesh Jaisawal, Vidit Gaur, Shahnawaz Ahmed
Summary: This study aimed to investigate the fatigue properties of AA5086-H321 and its weld joints. The weld joints showed similar hardness and ultimate tensile strength as the base alloy, but with slightly reduced elongation. The endurance limits of the weld joints were either higher or the same as compared to that of the base alloy. The fatigue lives of weld joints were increased due to crack growth retardation during intergranular fatigue crack propagation.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Nanoscience & Nanotechnology
Sumit Choudhary, Vidit Gaur
Summary: AA5086-H116 plates were welded with and without copper (Cu)-reinforcement using friction stir welding. Single-pass and double-pass processes were applied to develop a localized composite (AA5086/Cu). The addition of Cu-reinforcement improved the microhardness, weld joint efficiency, and fatigue strength of the welded joints.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Automation & Control Systems
Kjell Martin Kirkbakk, Nikolai Marhaug, Geir Kvam-Langelandsvik, Jens Christofer Werenskiold
Summary: Different inoculation particle combinations were introduced to the filler wire to improve the solidification characteristics and refine the grains in aluminium welding. Gas metal arc welding with a Ti-TiC inoculated filler wire showed a remarkable grain refinement of 91%, while gas tungsten arc welding showed lower grain refinement potency. The effect of welding method must be taken into consideration in the development of inoculant-containing filler wires.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Bruno Brum Moura, Daniel Souza, Mauricio de Oliveira Silva, Alice Goncalves Osorio
Summary: This study deposited weld overlays of Inconel 625 on low carbon steel base metal using different shielding gases, and evaluated their chemical composition, weld microstructure, mechanical behavior, and corrosion resistance. The results showed differences in chemical composition, weld microstructure, and mechanical behavior between samples welded with inert and active gases. Additionally, adding layers of Inconel 625 can enhance the corrosion resistance of low carbon steel, although samples welded with active gas may experience a decrease in corrosion resistance due to the precipitation of NbC phases.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Chemistry, Physical
Hana Sebestova, Petr Hornik, Sarka Mikmekova, Libor Mrna, Pavel Dolezal, Jan Novotny
Summary: The presence of Al-Si coating on 22MnB5 leads to the formation of large ferritic bands in the microstructure of butt laser welds, weakening the weld joints. Using hybrid laser-TIG welding technology can eliminate the large ferritic bands and improve the tensile strength of the welds.
Article
Engineering, Manufacturing
Guohong Ma, Haitao Yuan, Lesheng Yu, Yinshui He
Summary: A method based on active visual sensing and machine learning was proposed for detecting weld defects in galvanized steel, utilizing Gabor filter to remove interference signals and analyzing different defect characteristics in weld centerline images, with the design of a VL-MFBP neural network model for classification and prediction. Experimental results showed an accuracy of 98.15% in weld defect recognition, with an average processing time of 183.74 ms for a single image.
MATERIALS AND MANUFACTURING PROCESSES
(2021)
Article
Metallurgy & Metallurgical Engineering
S. Y. Wang, J. Chen, C. Y. Xia, R. D. Li, W. B. Zhang, C. S. Wu
Summary: This paper proposes a new method for predicting weld dimensions using binocular imaging information and a deep learning system. The method achieves an overall accuracy of over 93% in predicting weld dimensions, meeting the requirements of practical applications. The method utilizes convolutional neural networks and a new calculating procedure to effectively extract and link information from processed weld pool images and weld parameters.
Review
Engineering, Manufacturing
Pavel Layus, Paul Kah, Viktor Gezha
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE
(2018)
Review
Automation & Control Systems
Belinga Mvola, Paul Kah, Pavel Layus
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2018)
Article
Automation & Control Systems
Cyril Vimalraj, Paul Kah, Pavel Layus, Eric Mvola Belinga, Sergey Parshin
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2019)
Article
Materials Science, Multidisciplinary
Francois Njock Bayock, Paul Kah, Pavel Layus, Victor Karkhin
Article
Materials Science, Multidisciplinary
Francois Njock Bayock, Paul Kah, Belinga Mvola, Pavel Layus
Article
Automation & Control Systems
Sakari Penttilae, Paul Kah, Juho Ratava, Harri Eskelinen
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2019)
Review
Materials Science, Multidisciplinary
Cyril Vimalraj, Paul Kah
Summary: The study critically reviews the application of friction stir welding technology with nanoparticle reinforcement in aluminum alloy welding, emphasizing the significant influence of welding parameters on the dispersion of reinforcement particles and the improvement of weld microstructure and properties by nanoparticles.
Article
Materials Science, Multidisciplinary
Francois Njock Bayock, Paul Kah, Marius Kibong, Sadrack Timba
Summary: The research investigated the effect of thermal cycle on residual stress, microstructural constituents, and alloying elements composition of dissimilar S690QT and 316L austenite stainless steel. Experimental results showed differences in microstructure and alloying elements composition between 316L and S690QT in the heat-affected zone.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Multidisciplinary Sciences
Paul Kah, Gabriel Ogheneluona Edigbe, Benoit Ndiwe, Rastislav Kubicek
Summary: This study describes methods of assessing arc stability for selected gas metal arc welding conditions. The research found that higher voltage levels can reduce disturbances and improve stability and weld quality.
SN APPLIED SCIENCES
(2022)
Article
Materials Science, Multidisciplinary
Paul Kah, Pavel Layus, Benoit Ndiwe
Summary: This paper focuses on the application of submerged arc welding (SAW) process in Arctic structures. The study aims to explore the usability, development possibilities, and parameters of SAW process for welding thick cold-resistant high strength steels (HSS) plates. Experimental findings were used to develop acceptable welding parameters and recommendations, and the results showed that high-quality welds can be achieved using specific heat input.
AIMS MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Francois Njock Bayock, Paul Kah, Kibong Marius Tony
Summary: This study experimentally investigated the distortion and microstructural constituents in the heat-affected zone of different welded joints. The results showed that using appropriate parameters can prevent distortion and observed the formation of carbides and ferrite.
AIMS MATERIALS SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Francois Njock Bayock, Paul Kah, Antti Salminen, Mvola Belinga, Xiaochen Yang
REVIEWS ON ADVANCED MATERIALS SCIENCE
(2020)
Review
Nanoscience & Nanotechnology
Francois Njock Bayock, Paul Kah, Belinga Mvola, Pavel Layus
REVIEWS ON ADVANCED MATERIALS SCIENCE
(2019)
Article
Materials Science, Multidisciplinary
Pavel Layus, Paul Kah, Elena Khlusova, Victor Orlov
INTERNATIONAL JOURNAL OF MECHANICAL AND MATERIALS ENGINEERING
(2018)