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学者姓名：蒋凡
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Abstract ：
To address the surface oxidation and porosity defects in the wire-arc directed energy deposition of aluminum alloys, a laser-arc composite cleaning method is proposed for the irregular surface morphology of the deposited layer during the deposition process. The study analyzed the microscopic morphology of the surfaces after various cleaning methods and the changes in surface oxygen content, exploring the complementary rules and enhancement mechanisms of laser and electric arc cleaning in combined cleaning, as well as the optimal process parameter matching strategy. The effectiveness of the cleaning methods was evaluated by testing the porosity of the secondary deposited specimens after cleaning. The uncleaned specimens exhibited a porosity of 2.81%. Laser cleaning reduced this to 2.11%, while arc cleaning achieved 0.13%. The most significant reduction came from composite cleaning, with a minimum porosity of 0.05%. This indicates that composite cleaning can effectively reduce the porosity defects in additive manufacturing.
Keyword ：
porosity defects porosity defects arc cleaning arc cleaning oxygen content oxygen content Additive manufacturing Additive manufacturing cathodic spot cathodic spot
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| GB/T 7714 | Liu, Hao , Jiang, Fan , Li, Cheng et al. A novel interlayer cleaning methods for improving internal quality in wire-arc directed energy deposition: processing, characterisation and performance demonstration [J]. | VIRTUAL AND PHYSICAL PROTOTYPING , 2025 , 20 (1) . |
| MLA | Liu, Hao et al. "A novel interlayer cleaning methods for improving internal quality in wire-arc directed energy deposition: processing, characterisation and performance demonstration" . | VIRTUAL AND PHYSICAL PROTOTYPING 20 . 1 (2025) . |
| APA | Liu, Hao , Jiang, Fan , Li, Cheng , Zhu, Ruican , Liu, Wei , Yang, Di et al. A novel interlayer cleaning methods for improving internal quality in wire-arc directed energy deposition: processing, characterisation and performance demonstration . | VIRTUAL AND PHYSICAL PROTOTYPING , 2025 , 20 (1) . |
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Abstract ：
Arc additive manufacturing (AM) technology offers high deposition efficiency, making it well-suited for the fabrication of large and complex structural components. However, the repeated thermal cycling can lead to stress accumulation, with excessive residual stress potentially causing cracking and structural failure. The improved inherent strain method has demonstrated effectiveness in rapidly predicting stress in arc AM structures. Nevertheless, the existing inherent strain application schemes lack consideration for complex structures with thermal and mechanical mutations. To address this limitation, this study establishes a finite element model for a 30 degrees corner additive structure based on the thermo-elastoplastic (TEP) method and conducts experimental verification on the large-scale corner structure. By analyzing the influence of reheating effects in the corner region, multiple inherent strain application schemes were designed and evaluated. The scheme that applies the average inherent strain of the different trajectories showed good agreement with the TEP method in predicting X-direction stress. Compared with the TEP method, the average prediction error of X-stress in the linear center regions and corner regions of Path1 using the average inherent strain scheme is approximately 25 MPa and 46 MPa, significantly lower than the errors of 110 MPa and 130 MPa in the conventional inherent strain scheme. For Path2, the average corresponding prediction errors were about 53 MPa and 49 MPa. And the time cost of stress prediction using the inherent strain method is only 0.3% of that required by the TEP method. In the large 30 degrees corner structure with a side length of 0.3 m, the errors of the stress at the midpoint and inflection point of the first trajectory relative to the experimental measurement are approximately 40 MPa and 65 MPa, respectively.
Keyword ：
Stress prediction Stress prediction Arc additive manufacturing Arc additive manufacturing Inherent strain method Inherent strain method Corner structure Corner structure
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| GB/T 7714 | Jiang, Fan , Yang, Di , Xu, Bin et al. Numerical simulation of residual stress in arc additive manufacturing of corner structures based on the inherent strain method [J]. | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2025 , 137 (3-4) : 1727-1743 . |
| MLA | Jiang, Fan et al. "Numerical simulation of residual stress in arc additive manufacturing of corner structures based on the inherent strain method" . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 137 . 3-4 (2025) : 1727-1743 . |
| APA | Jiang, Fan , Yang, Di , Xu, Bin , Ma, Ninshu , Cai, Xinhan , Zhang, Xiaoyong et al. Numerical simulation of residual stress in arc additive manufacturing of corner structures based on the inherent strain method . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2025 , 137 (3-4) , 1727-1743 . |
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Abstract ：
变极性等离子弧（Variable Polarity Plasma Arc, VPPA）焊是一种高效的铝合金和镁合金焊接方法，其主要优势在于等离子电弧具有高能量密度，可以在焊接时穿透熔池形成小孔，大幅度降低焊接变形和残余应力，提高焊接质量。了解熔池小孔行为、电弧物理特性和控制方法对于优化和提高焊接过程的稳定性至关重要。本文综述了VPPA焊接技术发展的最新情况，对VPPA焊接过程信息的检测研究为深刻认识焊接稳定性机理提供了有力保障，尤其是利用X射线成像系统观测熔融金属流动的研究，对提升VPPA穿孔熔池物理本质的认识做出了重要贡献。此外，针对不同位置VPPA焊接的研究增加了这一焊接工艺的灵活性，由VPPA焊接衍生的多种拓展工艺拓宽了该焊接方法的适用范围。VPPA穿孔焊接技术以其焊接变形小、焊后无缺陷、单面焊接双面一次成形等优势，成为航空航天领域铝合金中厚板材焊接制造的优选工艺。
Keyword ：
熔池检测 熔池检测 电弧物理 电弧物理 变极性等离子弧焊 变极性等离子弧焊 复合焊接 复合焊接 稳定性控制 稳定性控制
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| GB/T 7714 | 蒋凡 , 张成钰 , 徐斌 et al. 变极性等离子弧焊技术发展及其在航天制造领域应用现状 [J]. | 航天制造技术 , 2024 , PageCount-页数: 12 (03) : 15-26 . |
| MLA | 蒋凡 et al. "变极性等离子弧焊技术发展及其在航天制造领域应用现状" . | 航天制造技术 PageCount-页数: 12 . 03 (2024) : 15-26 . |
| APA | 蒋凡 , 张成钰 , 徐斌 , 张国凯 , 闫朝阳 , 陈树君 . 变极性等离子弧焊技术发展及其在航天制造领域应用现状 . | 航天制造技术 , 2024 , PageCount-页数: 12 (03) , 15-26 . |
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Abstract ：
The twin-body plasma arc has the decoupling control ability of heat transfer and mass transfer, which is beneficial to shape and property control in wire arc additive manufacturing. In this paper, with the wire feeding speed as a characteristic quantity, the wire melting control ability of twin-body plasma arc was studied by adjusting the current separation ratio (under the condition of a constant total current), the wire current/main current and the position of the wire in the arc axial direction. The results showed that under the premise that the total current remains unchanged (100 A), as the current separation ratio increased, the middle and minimum melting amounts increased approximately synchronously under the effect of anode effect power, the first melting mass range remained constant; the maximum melting amount increased twice as fast as the middle melting amount under the effect of the wire feeding speed, and the second melting mass range was expanded. When the wire current increased, the anode effect power and the plasma arc power were both factors causing the increase in the wire melting amount; however, when the main current increased, the plasma arc power was the only factor causing the increase in the wire melting amount. The average wire melting increment caused by the anode effect power was approximately 2.7 times that caused by the plasma arc power. The minimum melting amount was not affected by the wire-torch distance under any current separation ratio tested. When the current separation ratio increased and reached a threshold, the middle melting amount remained constant with increasing wire-torch distance. When the current separation ratio continued to increase and reached the next threshold, the maximum melting amount remained constant with the increasing wire-torch distance. The effect of the wire-torch distance on the wire melting amount reduced with the increase in the current separation ratio. Through this study, the decoupling mechanism and ability of this innovative arc heat source is more clearly.
Keyword ：
Melting amount Melting amount Twin-body plasma arc Twin-body plasma arc Current separation ratio Current separation ratio Melting control ability Melting control ability
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| GB/T 7714 | Zhang, Ruiying , Jiang, Fan , Xue, Long . Experimental Study on Wire Melting Control Ability of Twin-Body Plasma Arc [J]. | CHINESE JOURNAL OF MECHANICAL ENGINEERING , 2024 , 37 (1) . |
| MLA | Zhang, Ruiying et al. "Experimental Study on Wire Melting Control Ability of Twin-Body Plasma Arc" . | CHINESE JOURNAL OF MECHANICAL ENGINEERING 37 . 1 (2024) . |
| APA | Zhang, Ruiying , Jiang, Fan , Xue, Long . Experimental Study on Wire Melting Control Ability of Twin-Body Plasma Arc . | CHINESE JOURNAL OF MECHANICAL ENGINEERING , 2024 , 37 (1) . |
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Abstract ：
This study investigates the mechanism behind the dual-stagnation points flow phenomenon in the keyhole plasma arc welding (KPAW) melt pool and develops a corresponding control strategy. Positional information on flow stagnation points was obtained using the macroscopic morphology of the melt pool and liquid flow velocity measurements. The position of these stagnation points, determined by the directional flow of liquid metal, is crucial for characterizing the stability of the welding process. The study delves into the driving force mechanism that produces stable directional flow and a uniform temperature distribution within the melt pool. A significant discovery of this research is the identification of high-speed directional material transport channels within the melt pool. Furthermore, a correlation mechanism between the positions of stagnation points and the stable flow with temperature distribution has been constructed. To address the unstable and destabilization stages of the welding process, a dynamic material stability transfer control strategy was designed, based on liquid flow velocity and temperature distribution. This strategy ensures a smooth transition during the unstable stage and rapid self-healing of the melt pool during destabilization. This study provides a novel control strategy and a theoretical foundation for the automation and enhancement of the KPAW welding process, highlighting its necessity in advancing welding technology.
Keyword ：
Control strategy Control strategy Filler wire Filler wire Liquid metal Liquid metal Heat transfer Heat transfer Convection pattern Convection pattern
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| GB/T 7714 | Liu, Jingbo , Jiang, Fan , Tashiro, Shinichi et al. The mechanism of dual-stagnation points flow phenomenon in keyhole plasma arc melt pool and corresponding control strategy [J]. | JOURNAL OF MANUFACTURING PROCESSES , 2024 , 125 : 473-488 . |
| MLA | Liu, Jingbo et al. "The mechanism of dual-stagnation points flow phenomenon in keyhole plasma arc melt pool and corresponding control strategy" . | JOURNAL OF MANUFACTURING PROCESSES 125 (2024) : 473-488 . |
| APA | Liu, Jingbo , Jiang, Fan , Tashiro, Shinichi , Chen, Shujun , Tanaka, Manabu , Zhang, Chengyu et al. The mechanism of dual-stagnation points flow phenomenon in keyhole plasma arc melt pool and corresponding control strategy . | JOURNAL OF MANUFACTURING PROCESSES , 2024 , 125 , 473-488 . |
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Abstract ：
A novel bypass coupling variable polarity plasma arc was proposed to achieve the accurate adjusting of heat and mass transfer in the welding and additive manufacturing of aluminum alloy. However, the physical characteristics and decoupled transfer behavior remain unclear, restricting its application and development. A three-dimensional model of the bypass coupling variable polarity plasma arc was built based on Kirchhoff's law, the main arc and the bypass arc are coupled by an electromagnetic field. The model of current attachment on the tungsten electrode surface is included for simulating different heating processes of the EP and EN phases in the coupling arc. The distribution of temperature field, flow field, and current density of the bypass coupling variable polarity plasma arc was studied by the three-dimensional numerical model. The heat input on the base metal under different current conditions is quantified. To verify the model, the arc voltages are compared and the results in simulation and experiment agree with each other well. The results show that the radius of the bypass coupling arc with or without bypass current action on the base metal is different, and the flow vector of the bypass coupling arc plasma with bypass current is larger than the arc without bypass current. By comparing the heat transfer on the electrodes' boundary under different current conditions, it is found that increasing the bypass current results in the rise in heat input on the base metal. Therefore, it is concluded that using bypass current is unable to completely decouple the wire melting and the heat input of the base metal. The decoupled degree of heat transfer is one of the important factors for accurate control in the manufacturing process with this coupling arc.
Keyword ：
numerical analysis numerical analysis bypass coupling VPPA bypass coupling VPPA decoupled heat transfer decoupled heat transfer physical characteristics physical characteristics
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| GB/T 7714 | Jiang, Fan , Miao, Qi , Xu, Bin et al. Numerical Analysis of Physical Characteristics and Heat Transfer Decoupling Behavior in Bypass Coupling Variable Polarity Plasma Arc [J]. | MATERIALS , 2022 , 15 (9) . |
| MLA | Jiang, Fan et al. "Numerical Analysis of Physical Characteristics and Heat Transfer Decoupling Behavior in Bypass Coupling Variable Polarity Plasma Arc" . | MATERIALS 15 . 9 (2022) . |
| APA | Jiang, Fan , Miao, Qi , Xu, Bin , Tashiro, Shinichi , Tanaka, Manabu , Lin, Sanbao et al. Numerical Analysis of Physical Characteristics and Heat Transfer Decoupling Behavior in Bypass Coupling Variable Polarity Plasma Arc . | MATERIALS , 2022 , 15 (9) . |
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Abstract ：
This study investigated heat and mass transfer as well as the effect of gravity on keyhole formation in the molten pool of keyhole plasma arc welding. The flow trajectory of the molten pool was obtained via high-speed camera images illuminated by a laser light system, and the temperature distribution was obtained using an infrared thermal camera. The experimental results showed that the molten metal flowed rearward and downward at the top surface of the weld pool and thereafter to the rear side of the keyhole. There are two types of reverse flow of molten metal on the rear side of the keyhole. The different welding positions had minimal effect on the flow pattern; however, the flow velocities were different. Further, for the temperature distribution, although the keyhole front side yielded a similar high-temperature area under different welding positions, the area of the high temperature on the keyhole rear side in the vertical position welding was much larger than that in the flat position. Consequently, the influence of the force on the keyhole molten pool was evaluated, and the flow pattern of the molten pool was found to be dominated by the sheer force. Moreover, the flow velocity and solidification morphology of the molten pool were affected by the gravity at different welding positions. In addition, the correlation mechanism of the temperature distribution, flow, and solidification morphology of the keyhole molten pool was analyzed using the combined action of shear force and gravity, which further revealed the mechanism of the influence of gravity on the keyhole welding process.(c) 2022 Elsevier Ltd. All rights reserved.
Keyword ：
The temperature distribution The temperature distribution VPPA welding VPPA welding Keyhole welding in different positions Keyhole welding in different positions Weld pool flow Weld pool flow Aluminum alloy Aluminum alloy
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| GB/T 7714 | Chen, Shujun , Liu, Jingbo , Jiang, Fan et al. Gravity effects on temperature distribution and material flow in the keyhole pool of VPPA Al welding [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2022 , 191 . |
| MLA | Chen, Shujun et al. "Gravity effects on temperature distribution and material flow in the keyhole pool of VPPA Al welding" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 191 (2022) . |
| APA | Chen, Shujun , Liu, Jingbo , Jiang, Fan , Xu, Bin , Zhang, Guokai , Li, Bo . Gravity effects on temperature distribution and material flow in the keyhole pool of VPPA Al welding . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2022 , 191 . |
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Abstract ：
Droplet state and transition process directly determine the forming quality of deposited layer in wire and arc additive manufacturing(WAAM). In this study, an in-situ measurement system of the droplet state (temperature, velocity and mass) at plasma arc was established. An innovative staged heating method was proposed to reduce the measuring error of droplet temperature caused by the plasma arc. Meanwhile, a trajectory fitting method was studied to predict the droplet velocity, because droplet morphology was difficult to keep consistent during the transferring process. Then, the effect of current and plasma gas rate on the droplet state measurement were studied. This study will provide an effective measurement method for the droplet state in the high temperature plasma arc environment.
Keyword ：
PAW (Plasma Arc Welding) PAW (Plasma Arc Welding) Droplet temperature Droplet temperature Droplet velocity Droplet velocity Droplet mass Droplet mass Aluminum alloys Aluminum alloys
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| GB/T 7714 | Li, Cheng , Jiang, Fan , Xu, Bin et al. In-situ measurement of the droplet temperature, velocity and mass under plasma arc [J]. | MEASUREMENT , 2022 , 202 . |
| MLA | Li, Cheng et al. "In-situ measurement of the droplet temperature, velocity and mass under plasma arc" . | MEASUREMENT 202 (2022) . |
| APA | Li, Cheng , Jiang, Fan , Xu, Bin , Zhang, Guokai , Chen, Shujun , Yan, Zhaoyang et al. In-situ measurement of the droplet temperature, velocity and mass under plasma arc . | MEASUREMENT , 2022 , 202 . |
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Abstract ：
本发明提供一种改善增材制造成型质量的方法及装置，包括以下步骤：在焊枪作用于工件形成的熔池旁设置至少一对第一激振器；驱动第一激振器跟随焊枪移动，以对工件的顶端表面进行增材作业；其中，各对第一激振器的振动波相互叠加并形成作用于熔池的第一振动加强区，第一振动加强区能基于各对第一激振器的振动参数调节移动位置和叠加频率。本发明所述的改善增材制造成型质量的方法及装置能够解决现有技术的超声辅助增材过程中能量浪费严重、振源过于单一以及振动施加区域缺乏针对性的缺陷，并能实现细化晶粒，改善成型的效果。
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| GB/T 7714 | 蒋凡 , 杨迪 , 陈树君 et al. 改善增材制造成型质量的方法及装置 : CN202211131639.4[P]. | 2022-09-15 . |
| MLA | 蒋凡 et al. "改善增材制造成型质量的方法及装置" : CN202211131639.4. | 2022-09-15 . |
| APA | 蒋凡 , 杨迪 , 陈树君 , 张国凯 , 徐斌 . 改善增材制造成型质量的方法及装置 : CN202211131639.4. | 2022-09-15 . |
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Abstract ：
本发明提供一种金属材料非平衡凝固过程模拟测试系统和方法，金属材料非平衡凝固过程模拟测试系统包括：熔滴获取装置具有熔滴出口，熔滴获取装置用于由熔滴出口输出具有设定温度的待测金属材料的熔滴；基板平台设置于熔滴出口的下方，基板平台的顶部用于放置试验基板；调温装置设置于基板平台的顶部，用于调节试验基板上的温度分布；激光加热装置用于朝向试验基板的上表面发射激光束，以加热落至试验基板上的熔滴；温度场检测装置用于检测试验基板上的温度分布；控制器与熔滴获取装置、调温装置、激光加热装置和温度场检测装置连接。本发明能够实现试验基板温度分布梯度和温度梯度变化对金属材料非平衡凝固成型影响的研究。
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| GB/T 7714 | 陈树君 , 李诚 , 蒋凡 et al. 金属材料非平衡凝固过程模拟测试系统和方法 : CN202210709315.8[P]. | 2022-06-21 . |
| MLA | 陈树君 et al. "金属材料非平衡凝固过程模拟测试系统和方法" : CN202210709315.8. | 2022-06-21 . |
| APA | 陈树君 , 李诚 , 蒋凡 , 张国凯 , 潘瑞 , 徐斌 . 金属材料非平衡凝固过程模拟测试系统和方法 : CN202210709315.8. | 2022-06-21 . |
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