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学者姓名：陈树君
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Abstract ：
As a conventional arc-depositing process, limited by the strong heat-mass coupling characteristics, gas metal arc welding (GMAW) is difficult to adapt to precision deposition requiring low heat input. To solve this problem, a novel high-dynamic locking-releasing wire feeding method driven by linear actuator was proposed and a compact mechanical structure was developed. The braking effect of the high-dynamic locking-releasing action of the wire feeding allows the molten droplets to acquire additional stronger drive forces, including the inertial force induced by the sudden locking of the wire and the elastic potential energy induced by the bending of the wire, both of which facilitate the droplet transition. The results show that the indirect 'energy storage' effect of the high-dynamic locking-releasing wire on the droplets enabled a stable one-droplet-per-pulse (ODPP) spray transfer with a transition frequency of 60 Hz at low heat input. The dynamic transition mechanism of the above ODPP process was revealed by kinetic simulations of the droplet. In addition, a new non-stationary re-locking (NSRL) control strategy was introduced, which further empowered droplets with greater inertial force through the sharp braking effect, thus significantly increased the transition frequency of the molten droplets (similar to 150 Hz). Further, by combining the above strategy with the growth characteristics of droplets under the specific pulsed currents, ODPP spray transfer with frequencies up to 190 Hz was achieved. These promising results indicates the promise of this method for precision arc deposition and even wire arc additive manufacturing at low heat input.
Keyword ：
One-droplet-per-pulse (ODPP) One-droplet-per-pulse (ODPP) Gas metal arc welding (GMAW) Gas metal arc welding (GMAW) Decoupling of heat and mass Decoupling of heat and mass Spray transfer Spray transfer Droplet transition Droplet transition
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| GB/T 7714 | Xiao, Jun , You, Wan , Chen, Shujun et al. A novel controlled high-dynamic braking effect-driven droplet transition in GMAW [J]. | JOURNAL OF MANUFACTURING PROCESSES , 2025 , 142 : 71-83 . |
| MLA | Xiao, Jun et al. "A novel controlled high-dynamic braking effect-driven droplet transition in GMAW" . | JOURNAL OF MANUFACTURING PROCESSES 142 (2025) : 71-83 . |
| APA | Xiao, Jun , You, Wan , Chen, Shujun , Xu, Zhifei , Wang, Zhihao . A novel controlled high-dynamic braking effect-driven droplet transition in GMAW . | JOURNAL OF MANUFACTURING PROCESSES , 2025 , 142 , 71-83 . |
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Abstract ：
In situ cleaning of the weld area on a substrate or weld beads is performed by adjusting power and the laser scanning speed using a conventional continuous high-power laser typically employed for welding or deposition. This process facilitates the removal of contaminants (e.g., oil residues, metal oxides, and post-weld black ash) and enables efficient planning and execution of the welding process. The influence of varying laser scanning power on the cleaning efficacy of a 6061 aluminum alloy substrate was examined. The findings revealed that, as the laser scanning power increased from 1200 W to 3900 W, the cleaning effectiveness on the aluminum alloy surface initially improved and then diminished. At lower laser scanning power levels, the energy was insufficient to evaporate and disintegrate the surface contaminants, whereas excessively high laser power tended to cause secondary burns and oxidation on the material surface. Additionally, excessively high laser scanning speeds reduced the overlap of the scanning area, thereby compromising the cleaning results. The proposed surface cleaning method, utilizing a standard continuous high-power laser, demonstrated satisfactory cleaning performance through visual inspection, oxide detection, and analysis of porosity defects in the weld beads produced post-cleaning. Pre-laser scanning and cleaning significantly reduced the incidence of porosity and enhanced weld quality. This method eliminates the need for a specialized laser cleaning system powered by short-pulse lasers and can serve as a supplementary approach to conventional cleaning methods or in situations where alternative methods are unavailable. Oscillating laser scanning can also be applied to clean curved weld surfaces, effectively removing contaminants and oxides from the deposited weld surface, which is particularly beneficial for multi-layer, multi-pass welding or additive manufacturing processes.
Keyword ：
oscillating laser oscillating laser in situ cleaning in situ cleaning formation quality formation quality aluminum alloy aluminum alloy
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| GB/T 7714 | Xiao, Jun , Liu, Ruikun , Ge, Xinyu et al. In Situ Cleaning of Bead Surfaces by Utilizing Continuous High-Power Laser Scanning [J]. | MATERIALS , 2025 , 18 (7) . |
| MLA | Xiao, Jun et al. "In Situ Cleaning of Bead Surfaces by Utilizing Continuous High-Power Laser Scanning" . | MATERIALS 18 . 7 (2025) . |
| APA | Xiao, Jun , Liu, Ruikun , Ge, Xinyu , Sheng, Weixing , Gai, Shengnan , Chen, Shujun . In Situ Cleaning of Bead Surfaces by Utilizing Continuous High-Power Laser Scanning . | MATERIALS , 2025 , 18 (7) . |
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Abstract ：
In this study, the heat and mass transfer processes of wire-arc directed energy deposition were investigated by introducing the concept of the additive units ordering stack. The relationship between the process parameters and formed dimensions was used to accurately predict the critical height of thermal equilibrium and establish process schemes to achieve thermal balance. A 2319 Al alloy part having fully equiaxed grains was fabricated. The impact of thermal equilibrium on the forming precision, microstructure, and mechanical properties was examined. After thermal equilibrium was achieved, the dimensions of the deposited layers stabilized, with a volumetric removal rate indicating a forming accuracy of 0.22 %, which was significantly better than the accuracy of 3.02 % achieved in non-equilibrium zones. The porosity-distribution density decreased, and the average hardness values exhibited a low standard deviation of approximately +5.46 HV0.2. Thermal-equilibrium conditions optimized the mushy zone, leading to a uniform equiaxed microstructure with an average grain size of 44.2 mu m and minimal size deviation between adjacent axial grains. Thermal equilibrium mitigated the effects of temperature differences on Cu atom diffusion, enhanced the microstructural uniformity, and achieved a tensilestrength consistency of 99.4 % in all directions, with average tensile strengths of 182.3 + 0.9 and 183.33 + 1.3 MPa in the transverse and longitudinal directions, respectively. This approach represents a fundamental advancement in achieving thermal equilibrium during the deposition process, offering new insights for improving forming accuracy and performance anisotropy.
Keyword ：
Additive units ordering stack Additive units ordering stack Wire-arc directed energy deposition Wire-arc directed energy deposition Microstructure Microstructure Thermal equilibrium Thermal equilibrium Isotropic property Isotropic property
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| GB/T 7714 | Wang, Xiaowei , Yan, Zhaoyang , Zhao, Tao et al. Grain structure and microstructural properties of 2139 Al alloy based on additive units ordering stack via wire-arc directed energy deposition [J]. | JOURNAL OF MATERIALS PROCESSING TECHNOLOGY , 2025 , 337 . |
| MLA | Wang, Xiaowei et al. "Grain structure and microstructural properties of 2139 Al alloy based on additive units ordering stack via wire-arc directed energy deposition" . | JOURNAL OF MATERIALS PROCESSING TECHNOLOGY 337 (2025) . |
| APA | Wang, Xiaowei , Yan, Zhaoyang , Zhao, Tao , Dong, Yu , Chen, Shujun , Li, Huijun . Grain structure and microstructural properties of 2139 Al alloy based on additive units ordering stack via wire-arc directed energy deposition . | JOURNAL OF MATERIALS PROCESSING TECHNOLOGY , 2025 , 337 . |
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Abstract ：
In this study, we investigated the effect of pulse current on the microstructure, texture, deformation behavior, and mechanical properties of Ti-6Al-4 V alloys fabricated by electrically assisted stationary friction stirring welding. With the increase of the rotation speed and peak pulse current, a lamellar structure precipitated in the stir zone became more elongated, resulting in a higher concentration of grain orientation distribution and a larger but gradually decreasing ratio of high-angle grain boundaries. Moreover, the texture strength increased, but still remained lower than that of the transition zone on both sides. The microhardness distribution of the welded joint was anisotropic in all layers, with the stir zone exhibiting the highest hardness, while the HAZ was identified as the weakest region. The joints have a maximum tensile strength of 1020.1 MPa and an elongation of 6%, respectively. The tensile strength is comparable to that of the base metal (BM), and the elongation reaches 57.7% of BM. This improvement is mainly attributed to grain refinement and uniformly distributed hardness. Furthermore, all tensile fractures were ductile fractures.
Keyword ：
Pulse current Pulse current Mechanical properties Mechanical properties Stationary shoulder friction stir welding Stationary shoulder friction stir welding Deformation behavior Deformation behavior Texture Texture
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| GB/T 7714 | Jiang, Wang , Li, Chaojiang , Yuan, Tao et al. Investigation on pulse current-assisted stationary shoulder friction stir welded Ti-6Al-4 V joints [J]. | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2024 , 134 (7-8) : 3373-3384 . |
| MLA | Jiang, Wang et al. "Investigation on pulse current-assisted stationary shoulder friction stir welded Ti-6Al-4 V joints" . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 134 . 7-8 (2024) : 3373-3384 . |
| APA | Jiang, Wang , Li, Chaojiang , Yuan, Tao , Chen, Shujun , Jiang, Xiaoqing , Bai, Yafeng . Investigation on pulse current-assisted stationary shoulder friction stir welded Ti-6Al-4 V joints . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2024 , 134 (7-8) , 3373-3384 . |
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Abstract ：
Inter-layer Friction Stir Processing on Arc Additive Manufactured Components offers significant potential for performance enhancement, yet the homogenization of microstructures has become a challenge for industrial application. To address this, 2319 Al-Cu alloy components were fabricated through the Wire Arc Additive Manufacturing + Interlayer Friction Stir Processing (WAAM-IFSP)1 technique, and a systematic study was conducted on the effects of deformation degree, deformation temperature, and strain rate changes on the microstructural evolution, revealing three distinct periodic microstructures. An increase in deformation degree resulted in a uniform periodic microstructure, attributed to the more uniform internal deformation caused by the increased deformation degree. At a deformation degree of 24.1 %, higher strength and ductility were achieved, along with a notable bimodal grain structure (BGS). Further research indicated that this structure would distribute more widely within the matrix with increasing strain rate, aiding in further performance breakthroughs, ultimately reaching an ultimate tensile strength (UTS) of 404 MPa and an elongation (EL) of 32 %. However, imperfections in the process led to inhomogeneity in the structure. Focusing on the dynamic recrystallization (DRX) mechanisms during stirring can improve this phenomenon. The research revealed that the fine grains in the BGS were controlled by a synergy of dominant discontinuous dynamic recrystallization (DDRX) and auxiliary continuous dynamic recrystallization (CDRX) nucleation mechanisms. The findings are expected to provide a theoretical basis for the optimization of WAAM-IFSP processes and microstructural and performance regulation, which is crucial for enhancing the industrial application prospects of aluminum alloys.
Keyword ：
Dynamic recrystallization mechanisms Dynamic recrystallization mechanisms Periodic microstructure Periodic microstructure Mechanical properties Mechanical properties Wire arc additive manufacturing Wire arc additive manufacturing
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| GB/T 7714 | Yuan, Tao , Xu, Daqing , Jiang, Xiaoqing et al. Origins and optimization mechanisms of periodic microstructures in Al-Cu alloys fabricated by wire arc additive manufacturing combined with Interlayer Friction Stir Processing [J]. | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2024 , 916 . |
| MLA | Yuan, Tao et al. "Origins and optimization mechanisms of periodic microstructures in Al-Cu alloys fabricated by wire arc additive manufacturing combined with Interlayer Friction Stir Processing" . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 916 (2024) . |
| APA | Yuan, Tao , Xu, Daqing , Jiang, Xiaoqing , Chen, Shujun . Origins and optimization mechanisms of periodic microstructures in Al-Cu alloys fabricated by wire arc additive manufacturing combined with Interlayer Friction Stir Processing . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2024 , 916 . |
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Abstract ：
Robotic friction stir welding (RFSW), with its wide application range, ample working space, and task flexibility, has emerged as a vital development in friction stir welding (FSW) technology. However, the low stiffness of serial industrial robots can lead to end-effector deviations and vibrations during FSW tasks, adversely affecting the weld quality. This paper proposes a dynamic dual particle swarm optimization (DDPSO) algorithm through a new comprehensive stability index that considers both the stiffness and vibration stability of the robot to optimize the installation position of complex space curve weldments, thereby enhancing the robot's stability during the FSW process. The algorithm employs two independent particle swarms for exploration and exploitation tasks and dynamically adjusts task allocation and particle numbers based on current results to fully utilize computational resources and enhance search efficiency. Compared to the standard particle swarm optimization (PSO) algorithm, the DDPSO approach demonstrated superior search capabilities and stability of optimization results. The maximum fitness value improved by 4.2%, the average value increased by 12.74%, and the concentration level of optimization results rose by 72.91% on average. The new optimization method pioneers fresh perspectives for optimizing the stability of RFSW, providing significant grounds for the process optimization and offline programming of complex spatial curve weldments.
Keyword ：
friction stir welding friction stir welding vibration stability vibration stability Cartesian stiffness ellipsoid Cartesian stiffness ellipsoid robot stability index robot stability index robot stiffness robot stiffness
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| GB/T 7714 | Zong, Guanchen , Kang, Cunfeng , Chen, Shujun et al. Optimization of Installation Position for Complex Space Curve Weldments in Robotic Friction Stir Welding Based on Dynamic Dual Particle Swarm Optimization [J]. | PROCESSES , 2024 , 12 (3) . |
| MLA | Zong, Guanchen et al. "Optimization of Installation Position for Complex Space Curve Weldments in Robotic Friction Stir Welding Based on Dynamic Dual Particle Swarm Optimization" . | PROCESSES 12 . 3 (2024) . |
| APA | Zong, Guanchen , Kang, Cunfeng , Chen, Shujun , Jiang, Xiaoqing . Optimization of Installation Position for Complex Space Curve Weldments in Robotic Friction Stir Welding Based on Dynamic Dual Particle Swarm Optimization . | PROCESSES , 2024 , 12 (3) . |
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Abstract ：
Robotic Friction Stir Welding (RFSW) technology integrates the advantages of friction stir welding and industrial robots, finding extensive applications and research in aerospace, shipbuilding, and new energy vehicles. However, the high-speed rotational process of friction stir welding combined with the low stiffness characteristics of serial industrial robots inevitably introduces vibrations during the welding process. This paper investigates the vibration patterns and impacts during the RFSW process and proposes an active vibration avoidance control method for variable speed welding based on constant heat input. This method utilizes a vibration feedback strategy that adjusts the spindle speed actively if the end-effector's vibration exceeds a threshold, thereby avoiding the modal frequencies of the robot at its current pose. Concurrently, it calculates and adjusts the welding speed of the robot according to the thermal equilibrium equation to maintain constant heat input. A simplified dynamic model of the RFSW robot was established, and the feasibility of this method was validated through simulation experiments. This study fills the gap in vibration analysis of RFSW and provides new insights into control strategies and process optimization for robotic friction stir welding.
Keyword ：
vibration analysis vibration analysis robot dynamics robot dynamics vibration feedback vibration feedback RFSW RFSW modal analysis modal analysis
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| GB/T 7714 | Zong, Guanchen , Kang, Cunfeng , Chen, Shujun . Active Vibration Avoidance Method for Variable Speed Welding in Robotic Friction Stir Welding Based on Constant Heat Input [J]. | MATERIALS , 2024 , 17 (11) . |
| MLA | Zong, Guanchen et al. "Active Vibration Avoidance Method for Variable Speed Welding in Robotic Friction Stir Welding Based on Constant Heat Input" . | MATERIALS 17 . 11 (2024) . |
| APA | Zong, Guanchen , Kang, Cunfeng , Chen, Shujun . Active Vibration Avoidance Method for Variable Speed Welding in Robotic Friction Stir Welding Based on Constant Heat Input . | MATERIALS , 2024 , 17 (11) . |
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Abstract ：
To improve the positioning accuracy of industrial robots and meet the requirements of industrial applications, this study begins with the structural design of multi-jointed industrial robots and proposes a kinematic calibration method based on axis fitting. The proposed method introduces an axis fitting technique based on circle fitting. Utilizing the results of the axis fitting, a method for establishing link coordinate systems by referencing the Modified Denavit-Hartenberg (MD-H) model is presented. Subsequently, a kinematic parameter identification method is proposed. This study primarily investigates the impact of joint rotation angles on the accuracy of axis fitting. The study reveals that when the rotation angle is greater than or equal to 20 degrees, the circularity of the circle fitting is less than 0.008 mm, and the planarity is less than 0.01 mm, indicating that the proposed fitting algorithm meets the required precision for small angle rotations. Finally, the positioning accuracy of the target robot is verified according to ISO 9283:1998. After calibration, the positioning accuracy at point P1 improves from 1.64 mm to 0.46 mm, an enhancement of 71.95 %, which is the most significant improvement. At point P2, the positioning accuracy improves from 1.75 mm to 0.69 mm, an enhancement of 60.5 %, which is the least improvement. The advantage of this method lies in its ability to identify kinematic parameters that align with the actual structure of the robot using a simple measurement method, thereby improving the robot's positioning accuracy.
Keyword ：
Kinematic calibration Kinematic calibration Positioning accuracy Positioning accuracy Axis fitting Axis fitting Industrial robots Industrial robots
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| GB/T 7714 | Cheng, Bo , Wang, Bo , Chen, Shujun et al. Investigation of axis-fitting-based measurement and identification techniques for kinematic parameters in multi-joint industrial robots [J]. | PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY , 2024 , 91 : 1-13 . |
| MLA | Cheng, Bo et al. "Investigation of axis-fitting-based measurement and identification techniques for kinematic parameters in multi-joint industrial robots" . | PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY 91 (2024) : 1-13 . |
| APA | Cheng, Bo , Wang, Bo , Chen, Shujun , Huang, Dishan , Dong, Bolun . Investigation of axis-fitting-based measurement and identification techniques for kinematic parameters in multi-joint industrial robots . | PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY , 2024 , 91 , 1-13 . |
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Abstract ：
本发明提供了一种热质力解耦控制的电弧增材装置和方法，装置包括：第一交流电源，第一焊丝，第一送丝系统，温度采集仪，第二焊丝，第二送丝系统，钨极组管，第三送丝系统，第三焊丝，等离子焊枪，第二交流电源和待加工的工件；所述钨极组管的中心具有通孔，所述第一焊丝可伸缩地穿过所述通孔，所述第一送丝系统驱动连接所述第一焊丝；第一交流电源、第二焊丝、电弧、第三焊丝组成电流回路；第二交流电源、钨极组管、电弧、工件组成电流回路；所述温度采集仪安装在所述等离子焊枪上，用于采集所述熔池的温度，所述温度采集仪与所述第一送丝系统相连接。本发明通过引入多极焊丝，在丰富增材件成分的同时，能够主动地调节增材过程中的熔池温度。
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| GB/T 7714 | 陈树君 , 王小伟 , 闫朝阳 et al. 一种热质力解耦控制的电弧增材装置和方法 : CN202310519673.7[P]. | 2023-05-09 . |
| MLA | 陈树君 et al. "一种热质力解耦控制的电弧增材装置和方法" : CN202310519673.7. | 2023-05-09 . |
| APA | 陈树君 , 王小伟 , 闫朝阳 , 肖珺 , 郭凯伟 . 一种热质力解耦控制的电弧增材装置和方法 : CN202310519673.7. | 2023-05-09 . |
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Abstract ：
本发明公开了调控等离子弧热力分布改善等离子增材制造中沉积层形貌装置和方法，该装置是在等离子增材制造条件下，通过对电弧的热力分布动态控制，调节电弧的热力作用，影响电弧的热力分布和热输入作用范围以及熔池流动行为，改善等离子弧增材制造中沉积层的形貌。同时该装置还与结构光相机相连，通过将相机提取到的表面信号与预设的沉积层形貌作比较所得的信息作为控制信号，控制动态推拉装置使钨极内缩量发生改变，改变沉积层的宽度和高毒，达到实时控制沉积层形貌的目标。
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| GB/T 7714 | 张国凯 , 许志合 , 蒋凡 et al. 调控等离子弧热力分布改善等离子增材制造中沉积层形貌装置和方法 : CN202310479070.9[P]. | 2023-04-28 . |
| MLA | 张国凯 et al. "调控等离子弧热力分布改善等离子增材制造中沉积层形貌装置和方法" : CN202310479070.9. | 2023-04-28 . |
| APA | 张国凯 , 许志合 , 蒋凡 , 陈树君 , 徐斌 , 彭勇 . 调控等离子弧热力分布改善等离子增材制造中沉积层形貌装置和方法 : CN202310479070.9. | 2023-04-28 . |
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