Article
Automation & Control Systems
Ping Yao, Heqing Tang, Kun Bin, Meiyi Chen, Kang Zhou
Summary: The double-wire double-pulse gas shielded metal arc welding (DP-GMAW) process is commonly used in stainless steel welding due to its advantages in high cladding rate and welding quality. This study investigated the influence of double-wire DP frequency on weld bead formation and mechanical performance. The experimental results showed that a frequency of 3 Hz achieved the best stability and optimal weld bead formation. Increasing the frequency resulted in fish-scale ripples, smaller grain size, increased hardness, and tensile strength.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Jie Huang, Tao Chen, Daqing Huang, Tengzhou Xu
Summary: In this study, the dynamic behavior characteristics of droplet transition and weld pool in high-speed photography are extracted using an image processing program. The transfer of mass, heat, and momentum due to arc heating and droplet impact influences the dynamic behavior of the weld pool and microstructure in P-GMAW process. The influence of current waveform on arc pressure and droplet impact is quantitatively analyzed with different parameters. Furthermore, the internal relation between current waveform parameters and weld pool behavior and microstructure is investigated. The results show that droplet impact is positively related to pulse peak current, and rectangular wave pulse has a stronger impact than exponential wave with the same waveform parameters. The impact of droplet transition enhances the convective intensity of the weld pool and slows down the cooling rate of the solidified weld microstructure, resulting in increased grain size.
Article
Materials Science, Multidisciplinary
Bin Shen, Jun Lu, Yiming Wang, Dongli Chen, Jing Han, Yi Zhang, Zhuang Zhao
Summary: This paper introduces the importance and application prospects of weld reinforcement monitoring or prediction systems based on multimodality in intelligent welding systems. The adoption of multi-modal sensor fusion method effectively monitors welding quality and detects anomalies, and the experimental results prove the effectiveness of the system.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Mechanical
Fabio Goncalves da Silva, Eduardo M. Braga, Valtair A. Ferraresi, Demostenes Ferreira Filho
Summary: This study evaluates the cavitation erosion resistance of hydraulic turbine coatings using different alloys deposited by the Cold-Wire-Gas Metal Arc Welding (CW-GMAW) process. The results show that CW-GMAW can reduce production costs and cobalt alloys have better cavitation erosion resistance.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Camille Cambon, Issam Bendaoud, Sebastien Rouquette, Fabien Soulie
Summary: A two-dimensional experimental setup was designed to investigate the influence of process parameters during WAAM operation. The study found that the welding thermal cycle impacted the displacement, weld pool size, and residual stresses, with minimal effects on residual stresses in the melted zone.
MATERIALS TODAY COMMUNICATIONS
(2022)
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
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
Materials Science, Multidisciplinary
Joao V. S. Matias, Manuel J. C. Lourenco, Jorge C. F. Jorge, Luis Felipe G. de Souza, Humberto N. Farneze, Matheus C. Mendes, Cilene Labre Alves da Silva, Leonardo S. Araujo
Summary: The performance of a superaustenitic stainless steel weld metal containing 6%Mo deposited by the GMAW process was studied. Microstructure characterization and corrosion performance tests were performed on the weld metal. The results showed that the weld metal had similar corrosion resistance to the original alloys, indicating its potential as an alternative for weld claddings in the oil and gas industry.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Crystallography
Chao Zhang, Qingxian Hu, Juan Pu, Hao Wu
Summary: This study investigates the fluid behavior of cable-type wire hybrid welding through numerical simulation and experimental verification on Q235 thin plate. The results show that keyholes form in the molten pool due to the strong penetration ability of a plasma arc. Increase in GMAW welding current enlarges the size of the weld pool and speeds up the flow rate of molten metal. Increase in PAW current also increases the length and flow rate of molten metal in the weld pool. Additionally, increasing welding speed decreases the size and fusion depth of the weld pool, but the effect on reinforcement is uncertain.
Article
Physics, Applied
Zhidong Yang, Yuntao Chen, Dongdong Yang, Chenfu Fang, Guoxiang Xu, Yueyun Li
Summary: This study investigates the behavior of the molten pool in cable-type welding wire gas metal arc welding (CWW-GMAW) through numerical simulations and experiments. The results show that the arc rotation force significantly affects the velocity of the molten pool in the direction of weld penetration. The rotating momentum of the droplet impacts the temperature distribution on the cross-section of the molten pool. The coupling of electromagnetic force and rotating arc force results in a clockwise vortex flow field.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2022)
Article
Engineering, Manufacturing
Kaiyuan Wu, Yucai Zeng, Mingjin Zhang, Xiaobin Hong, Peimin Xie
Summary: This paper presents a double-wire GMAW system to investigate the effects of high-frequency phase shift on metal transfer and bead formation. The experimental results show that a 180 degrees phase shift leads to the most stable welding process resulting in a sound weld with good penetration and low porosity.
JOURNAL OF MANUFACTURING PROCESSES
(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
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.
