Article
Thermodynamics
Ziyou Yang, Hui Fang, Kangning Jin, Jingshan He, Wenjun Ge, Wentao Yan
Summary: This study adopts a multi-physics modeling framework to simulate the microstructure evolution during electron beam welding (EBW). The molten pool model, dynamic heat source model, and grain growth process consider the effects of temperature and chemical concentration. A method to track the second phase and an algorithm to identify complex weld shapes are proposed. The effects of process parameters on grain morphology, grain size, segregation, and second phase are quantified based on simulated results, which are compared to experimental observations.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Engineering, Industrial
Ziyou Yang, Hui Fang, Kangning Jin, Jingshan He, Wenjun Ge, Wentao Yan
Summary: This study uses an integrated modeling framework to predict welding quality, covering molten pool dynamics, dendrite growth, and mechanical properties. The simulation results demonstrate the potential and practicality of this modeling framework, which can be helpful for optimizing the welding process.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2022)
Article
Engineering, Industrial
S. Hollatz, M. Hummel, A. Olowinsky, A. Gillner, F. Beckmann, J. Moosmann
Summary: This study investigates the welding issues of aluminium and copper, including the formation of pores and the mixing of the materials. By visualizing the phase boundaries and tracking the movement of bubbles in the melt pool during laser welding, the researchers were able to analyze these problems and develop compensatory measures for an improved welding process.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2022)
Article
Engineering, Manufacturing
Yanqiu Zhao, Xiang Li, Zhiqiang Liu, Jianfeng Wang, Yue Li, Xiaohong Zhan
Summary: This paper investigates the impact of different laser energy on the molten pool and keyhole during fiber-diode laser hybrid welding, and reveals the relationship between the dynamic characteristics of the molten pool and the keyhole. It demonstrates that fiber-diode hybrid welding can improve welding stability and quality.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Crystallography
Jin Peng, Hongqiao Xu, Xiaohong Yang, Xingxing Wang, Shuai Li, Weimin Long, Jian Zhang
Summary: This paper presents a numerical simulation of molten pool dynamics in laser deep penetration welding of aluminum alloys using FLUENT 19.0 software. The analysis focuses on the three-dimensional transient behavior of the keyhole and the flow field of molten pool at different welding speeds. The results show that the generation of welding spatters is directly related to the fluctuation of the keyhole diameter and the welding speed has an influence on the formation of welding spatters.
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
Thermodynamics
Won-Ik Cho, Peer Woizeschke
Summary: In this study, molten pool flow and heat transfer in laser welding process with beam oscillation and filler wire feeding were calculated using CFD. The surface fluctuation was measured and analyzed with Fourier and wavelet transforms to study the beam oscillation frequency and buttonhole formation. The wavelet transform effectively analyzed rapid behaviors based on the change of frequency components over time.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Automation & Control Systems
Yuxuan Zhu, Bolun Dong, Xiaoyu Cai, Sanbao Lin
Summary: This study investigates the molten pool behavior in NG-GTAW root welding using numerical simulation. A 3D numerical model is established, and it is found that the molten pool behavior is controlled by electromagnetic force, while the dynamic change of the vortex determines the molten pool morphology. For self-fusion welding, there are two symmetric inward vortices in the cross-section and one clockwise vortex in the longitudinal section. With the increasing welding current, the vortices in the cross-section move towards the arc center with a decreasing range, while the vortex in the longitudinal section moves backward. For wire-feed welding, the filling metal strengthens the downward velocity component, blocking the vortex formation in the cross-section and strengthening it in the longitudinal section.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Optics
Xuni Yin, Yi Zhang, Bin Li, Cong Chen
Summary: This study focuses on the morphology and temperature variations in molten pools during laser deep penetration welding. A floating layer on the surface of the molten pool was discovered and its morphology, temperature, and thickness were described. The study also revealed a correlation between the floating layer morphology and the temperature distribution of the molten pool. The results provide important insights into the factors influencing the thickness variation of the floating layer and its impact on weld reinforcement.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Engineering, Manufacturing
Ruiqing Lang, Yongquan Han, Xueyu Bai, Xulei Bao
Summary: The influence of keyhole molten pool metal flow on molten pool stability was studied and a new thermal-mechanical coupling model was developed. The research results show that the stable existence of the molten pool can be achieved by controlling the metal flow behavior.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Materials Science, Multidisciplinary
Jin Peng, Jigao Liu, Xiaohong Yang, Jianya Ge, Peng Han, Xingxing Wang, Shuai Li, Yongbiao Wang
Summary: In this paper, a heat-flow coupling model of laser welding at preheating temperature was established using FLUENT 19.0 software. The analysis of keyhole wall fluctuation and melt flow behavior in the molten pool under different preheating temperatures revealed the correlation between keyhole wall fluctuation and spatters and bubbles. The study found that the preheating temperature affects the shape of the keyhole wall and the occurrence of welding spatters and keyhole collapse.
Article
Materials Science, Multidisciplinary
Zongyu Dang, Guoliang Qin, Tongyi Li
Summary: Replacing copper with aluminum in the refrigeration industry is a common way to reduce production costs and weight. Inertia friction welding was used to join aluminum and copper pipes, and the effects of welding parameters on mechanical properties were studied. The formation of Al-Cu IMCs at the friction interface plays a crucial role in achieving metallurgical bonding. The type and thickness of IMCs are closely related to the tensile strength of the joints.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Civil
Xiaoer Zhao, Yong Chang, Jichun Wu, Qi Li, Zhaodan Cao
Summary: This study investigated the relationship between model parameters and pool volume, finding that the duration time of the BTC and the mean residence time of the solute increase linearly with the pool volume. The cross-sectional area of the storage zone or the calculated volume of the storage zone shows a good linear relationship with the pool volume, indicating potential for estimating pool volume using these parameters. Other model parameters like dispersion coefficient and exchange coefficient have strong connections with pool type and flow conditions but cannot directly deduce the internal conduit structure.
JOURNAL OF HYDROLOGY
(2021)
Article
Chemistry, Physical
Faguo Li, Dongming Shi, Xiaoyuan Hu, Fucheng Yin, Jiao Zhang, Baode Sun
Summary: This study conducted experiments on the directional growth of alpha-Al dendrites in Al-Cu alloys under concentration gradients, and used regression analysis to establish the relationship between primary and secondary dendrite arm spacings and solidification parameters, providing mathematical models to predict the microstructure of concentration-gradient alloys. The results were consistent with previous experimental work, offering guidance for designing concentration-gradient alloys with specific properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Thermodynamics
Wei Xu, Pin Li, Huixia Liu, Hao Wang, Xiao Wang
Summary: This study focused on the formation of molten pool during laser transmission welding, indicating that heat conduction plays a more significant role than convection, and temperature is the key factor in molten pool formation.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Materials Science, Multidisciplinary
Gaoyang Mi, Xiaohong Zhan, Yanhong Wei, Wenmin Ou, Cheng Gu, Fengyi Yu
MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING
(2015)
Article
Crystallography
Lei Wang, Yanhong Wei, Fengyi Yu, Qi Zhang, Qingyu Peng
CRYSTAL RESEARCH AND TECHNOLOGY
(2016)
Article
Materials Science, Multidisciplinary
L. Wang, Y. Wei, F. Yu
MATERIALS SCIENCE AND TECHNOLOGY
(2017)
Article
Optics
Xiaohong Zhan, Yubo Li, Wenmin Ou, Fengyi Yu, Jie Chen, Yanhong Wei
OPTICS AND LASER TECHNOLOGY
(2016)
Article
Engineering, Industrial
Lei Wang, Yanhong Wei, Xiaohong Zhan, Fengyi Yu, Xiyong Cao, Cheng Gu, Wenmin Ou
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2017)
Article
Materials Science, Multidisciplinary
Cheng Gu, Yanhong Wei, Fengyi Yu, Xiangbo Liu, Lvbo She
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2017)
Article
Materials Science, Multidisciplinary
Cheng Gu, Yanhong Wei, Renpei Liu, Fengyi Yu
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2017)
Article
Engineering, Industrial
Fengyi Yu, Yanhong Wei, Yanzhou Ji, Long-Qing Chen
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2018)
Article
Materials Science, Multidisciplinary
Fengyi Yu, Yanhong Wei
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2018)
Article
Engineering, Industrial
Gaoyang Mi, Yanhong Wei, Xiaohong Zhan, Cheng Gu, Fengyi Yu
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2014)
Article
Thermodynamics
Fengyi Yu, Yanzhou Ji, Yanhong Wei, Long-Qing Chen
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2019)
Article
Physics, Applied
Fengyi Yu
Summary: In alloy solidification, the transport processes of heat and solute lead to morphological instability of the interface, resulting in different solidification structures and determining the mechanical properties of the components. This paper focuses on the planar instability in alloy solidification under varying conditions. The dynamical evolution of the planar instability is studied using both a theoretical model and phase-field model, and the criterion for planar instability under varying conditions is discussed. The critical parameters for the planar instability are found to be excess free energy at the interface and corresponding interfacial energy.
JOURNAL OF APPLIED PHYSICS
(2023)