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学者姓名：韩绍华
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Abstract ：
本文针对混凝土泵车臂架主焊缝焊接进行有限元分析,通过对比不同焊接顺序及焊接热输入仿真结果可知:焊接热输入和焊接顺序均对混凝土臂焊接变形均产生影响,其中焊接热输入对混凝土泵车臂架的变形影响更大,采用较小的热输入,同时采用焊接顺序为先焊接焊缝组 1 再焊接焊缝组2时的焊接工艺参数较优.
Keyword ：
simufact welding simufact welding 有限元分析 有限元分析 焊接变形 焊接变形 臂架 臂架 高强钢 高强钢
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| GB/T 7714 | 刘欢 , 金群 , 谭芝芝 et al. 混凝土泵车臂架焊接有限元仿真分析 [J]. | 建设机械技术与管理 , 2024 , 37 (1) : 64-67 . |
| MLA | 刘欢 et al. "混凝土泵车臂架焊接有限元仿真分析" . | 建设机械技术与管理 37 . 1 (2024) : 64-67 . |
| APA | 刘欢 , 金群 , 谭芝芝 , 吴志强 , 刘帅 , 韩绍华 . 混凝土泵车臂架焊接有限元仿真分析 . | 建设机械技术与管理 , 2024 , 37 (1) , 64-67 . |
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PurposeBecause of the advantages of high deposition efficiency and low manufacturing cost compared with other additive technologies, robotic wire arc additive manufacturing (WAAM) technology has been widely applied for fabricating medium- to large-scale metallic components. The additive manufacturing (AM) method is a relatively complex process, which involves the workpiece modeling, conversion of the model file, slicing, path planning and so on. Then the structure is formed by the accumulated weld bead. However, the poor forming accuracy of WAAM usually leads to severe dimensional deviation between the as-built and the predesigned structures. This paper aims to propose a visual sensing technology and deep learning-assisted WAAM method for fabricating metallic structure, to simplify the complex WAAM process and improve the forming accuracy.Design/methodology/approachInstead of slicing of the workpiece modeling and generating all the welding torch paths in advance of the fabricating process, this method is carried out by adding the feature point regression branch into the Yolov5 algorithm, to detect the feature point from the images of the as-built structure. The coordinates of the feature points of each deposition layer can be calculated automatically. Then the welding torch trajectory for the next deposition layer is generated based on the position of feature point.FindingsThe mean average precision score of modified YOLOv5 detector is 99.5%. Two types of overhanging structures have been fabricated by the proposed method. The center contour error between the actual and theoretical is 0.56 and 0.27 mm in width direction, and 0.43 and 0.23 mm in height direction, respectively.Originality/valueThe fabrication of circular overhanging structures without using the complicate slicing strategy, turning table or other extra support verified the possibility of the robotic WAAM system with deep learning technology.
Keyword ：
Circular overhanging structure Circular overhanging structure Feature point Feature point Wire arc additive manufacturing Wire arc additive manufacturing YOLOv5 YOLOv5
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| GB/T 7714 | Zheng, Pingyang , Han, Shaohua , Xue, Dingqi et al. Deep learning assisted fabrication of metallic components using the robotic wire arc additive manufacturing [J]. | RAPID PROTOTYPING JOURNAL , 2024 , 30 (4) : 733-744 . |
| MLA | Zheng, Pingyang et al. "Deep learning assisted fabrication of metallic components using the robotic wire arc additive manufacturing" . | RAPID PROTOTYPING JOURNAL 30 . 4 (2024) : 733-744 . |
| APA | Zheng, Pingyang , Han, Shaohua , Xue, Dingqi , Fu, Ling , Jiang, Bifeng . Deep learning assisted fabrication of metallic components using the robotic wire arc additive manufacturing . | RAPID PROTOTYPING JOURNAL , 2024 , 30 (4) , 733-744 . |
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Abstract ：
本文针对不同刚性约束条件对混凝土泵车臂架主焊缝焊接变形的影响进行研究，通过对比不同刚性约束条件下的仿真结果可知：在混凝土泵臂中部加装增加刚性约束可以有效控制泵车臂架主焊缝焊接变形，且增加中部刚性约束对臂身挠曲（y向）的正向变形影响最大。同时增加刚性约束对焊接变形的影响远远大于调整焊接参数和焊接顺序对焊接变形的影响，可优选增加刚性约束方式进行泵车臂架焊接变形控制。
Keyword ：
simufact welding simufact welding 刚性约束 刚性约束 残余应力 残余应力 泵车臂架 泵车臂架 焊接有限元分析 焊接有限元分析
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| GB/T 7714 | 刘欢 , 金群 , 谭芝芝 et al. 刚性约束对混凝土泵车臂架焊接变形的影响研究 [J]. | 建设机械技术与管理 , 2024 , 37 (04) : 49-51 . |
| MLA | 刘欢 et al. "刚性约束对混凝土泵车臂架焊接变形的影响研究" . | 建设机械技术与管理 37 . 04 (2024) : 49-51 . |
| APA | 刘欢 , 金群 , 谭芝芝 , 吴志强 , 韩绍华 . 刚性约束对混凝土泵车臂架焊接变形的影响研究 . | 建设机械技术与管理 , 2024 , 37 (04) , 49-51 . |
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为研究外加纵向磁场对熔化极气体保护焊接的熔滴温度、尺寸、滴落速度的影响规律，选用ER304不锈钢焊丝，氩气为保护气，建立了考虑外加纵向磁场的二维轴对称熔滴过渡数值模型，模拟的熔滴尺寸结果与试验结果吻合较好。结果显示：当其他焊接参数不变时，在一定范围内随着外加纵向磁场的增大，脱落时刻熔滴径向长度逐渐增大，轴向长度逐渐减小，形状由长球形变为扁球形，过渡频率逐渐减小。但外加纵向磁场对熔滴脱落时刻温度、滴落速度的影响是间接的且较小。
Keyword ：
外加磁场 外加磁场 数值模拟 数值模拟 熔滴温度 熔滴温度
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| GB/T 7714 | 黄泽涵 , 韩绍华 , 薛丁琪 et al. 基于外加纵向磁场的MIG熔滴过渡数值模拟 [J]. | 热加工工艺 , 2023 , (01) : 127-130 . |
| MLA | 黄泽涵 et al. "基于外加纵向磁场的MIG熔滴过渡数值模拟" . | 热加工工艺 01 (2023) : 127-130 . |
| APA | 黄泽涵 , 韩绍华 , 薛丁琪 , 顾天奇 . 基于外加纵向磁场的MIG熔滴过渡数值模拟 . | 热加工工艺 , 2023 , (01) , 127-130 . |
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本发明涉及一种基于ROS平台的智能化焊接系统及其工作方法。所述系统基于ROS操作机器人系统框架实现，通过视觉传感设备采集焊缝轨迹数据，使用ROS平台进行运动轨迹规划并发送数据至机器人运动控制系统，而且能够实现ROS与机器人控制系统双向收发数据，从而省去了人工示教的麻烦，大大提高了焊接机器人的焊接自动化程度，实现智能化焊接。本发明适用于弧焊机器人的运动控制。
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| GB/T 7714 | 韩绍华 , 薛丁琪 , 郑坪杨 . 一种基于ROS平台的智能化焊接系统及其工作方法 : CN202111073807.4[P]. | 2021-09-14 00:00:00 . |
| MLA | 韩绍华 et al. "一种基于ROS平台的智能化焊接系统及其工作方法" : CN202111073807.4. | 2021-09-14 00:00:00 . |
| APA | 韩绍华 , 薛丁琪 , 郑坪杨 . 一种基于ROS平台的智能化焊接系统及其工作方法 : CN202111073807.4. | 2021-09-14 00:00:00 . |
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The workpiece fabricated by wire and arc additive manufacturing is usually made up of hundreds of welds. If the slag is not cleaned up and adherent to the weld surface, it will be stuck in welds and becomes inclusions and other defects within the structures. This is not only the case when using flux cored wire as the consumable material, but also with solid wire. Different weld morphologies were studied by controlling the slag treatment after each layer deposition, in terms of non-destructive test (X-ray radiographic testing). Further investigation of the microstructures and composition of slag inclusions were developed by SEM and EDS analysis. Charpy V-notch impact test has been conducted on the specimens both in vertical and horizontal direction to the deposition direction and tested at 0 degrees C, -20 degrees C and -60 degrees C. The fracture surfaces of the specimen made without any slag treatment after deposition exhibit large number of welding defects, which is highly responsible for lowering the impact toughness. On the other hand, completely clear away of the slag by extensively inter-pass grinding gives rise to a fine grain structure and relative high impact toughness, however, a huge sacrifice of the production efficiency and high material waste is unavoidable.
Keyword ：
Impact toughness Impact toughness Non-destructive testing Non-destructive testing Slag Slag WAAM WAAM
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| GB/T 7714 | Han, Shaohua , Cheng, Zhaomo , Li, Xiaoling et al. Effect of interlayer surface preparation on microstructures and mechanical properties of wire and arc additive manufactured low carbon steel objects [J]. | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2022 , 839 . |
| MLA | Han, Shaohua et al. "Effect of interlayer surface preparation on microstructures and mechanical properties of wire and arc additive manufactured low carbon steel objects" . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 839 (2022) . |
| APA | Han, Shaohua , Cheng, Zhaomo , Li, Xiaoling , Xie, Zhenquan , Geng, Zhijie , Xue, Dingqi . Effect of interlayer surface preparation on microstructures and mechanical properties of wire and arc additive manufactured low carbon steel objects . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2022 , 839 . |
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电弧增材制造技术具有广阔的发展前景,尤其是对于小批量、复杂结构零件的研发及生产制造具有很大优势。通过以全封闭中空环形结构件为研究对象,基于CMT熔覆技术,对其进行电弧增材制造的工艺试验研究,旨在通过改变焊枪位姿和电弧参数,研究中空环形结构件的合理制造方法。试验研究表明:多方位电弧增材制造可以克服重力对熔覆金属的影响,通过非完全对称的增材路径获得良好的结构成形。
Keyword ：
中空环形结构 中空环形结构 全封闭结构 全封闭结构 电弧增材制造 电弧增材制造 路径规划 路径规划
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| GB/T 7714 | 薛丁琪 , 阮鹏祥 , 齐绍寅 et al. 中空环形结构的电弧增材工艺研究 [J]. | 金属加工(热加工) , 2021 , (02) : 33-37 . |
| MLA | 薛丁琪 et al. "中空环形结构的电弧增材工艺研究" . | 金属加工(热加工) 02 (2021) : 33-37 . |
| APA | 薛丁琪 , 阮鹏祥 , 齐绍寅 , 张种种 , 韩绍华 . 中空环形结构的电弧增材工艺研究 . | 金属加工(热加工) , 2021 , (02) , 33-37 . |
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熔化极惰性气体保护焊中,高温电弧使焊丝部分蒸发成蒸汽,基于磁流体动力学模拟了金属蒸汽和外加纵向磁场下的MIG电弧.结果表明:金属蒸汽改变了电弧温度分布和温度梯度,温度峰值降幅达23.6％;外加纵向磁场强度每增加0.01 T,金属蒸汽在工件表面的覆盖半径减小约12.9％,外加磁场可控制低碳钢焊接烟尘中含量最多的铁蒸汽分布.
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| GB/T 7714 | 付瑜 , 韩绍华 , 薛丁琪 . 基于金属蒸汽和外加磁场的MIG电弧模拟 [J]. | 兵器材料科学与工程 , 2021 , 44 (3) : 94-98 . |
| MLA | 付瑜 et al. "基于金属蒸汽和外加磁场的MIG电弧模拟" . | 兵器材料科学与工程 44 . 3 (2021) : 94-98 . |
| APA | 付瑜 , 韩绍华 , 薛丁琪 . 基于金属蒸汽和外加磁场的MIG电弧模拟 . | 兵器材料科学与工程 , 2021 , 44 (3) , 94-98 . |
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基于冷金属过渡技术,研究了全封闭薄壁中空环形件的电弧增材制造工艺.首先在单层单道熔敷层圆弧形截面轮廓的基础上推导了单道多层熔敷层的叠加数学模型;其次建立了可根据薄壁结构尺寸获取合理工艺参数的等体积电弧增材模型,最后通过试验数据验证了模型的可靠性.基于该模型,建立了工艺参数(送丝速度、电弧移动速度)与成形件尺寸之间的关系,在优化的增材工艺下成形出了外观质量良好的薄壁中空环形工件,并将成形件扫描得到的实际轮廓与理论轮廓进行对比,验证了叠加模型和等体积增材模型的准确性以及工艺的可行性.
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| GB/T 7714 | 薛丁琪 , 阮鹏祥 , 程诗文 et al. 薄壁中空环形件的电弧增材制造工艺分析 [J]. | 焊接学报 , 2021 , 42 (4) : 42-48 . |
| MLA | 薛丁琪 et al. "薄壁中空环形件的电弧增材制造工艺分析" . | 焊接学报 42 . 4 (2021) : 42-48 . |
| APA | 薛丁琪 , 阮鹏祥 , 程诗文 , 张种种 , 耿海滨 , 韩绍华 . 薄壁中空环形件的电弧增材制造工艺分析 . | 焊接学报 , 2021 , 42 (4) , 42-48 . |
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为研究熔化极气体保护焊接熔滴过渡行为中熔滴温度、尺寸、滴落速度的变化规律,用304不锈钢焊丝,氩气为保护气,建立考虑温度场的二维轴对称熔滴过渡数值模型.结果表明:熔滴脱落前温度最大值出现在熔化的焊丝金属端部,熔滴脱落后温度最大值出现在熔滴中心区;随脱落后时间增加,熔滴平均温度逐渐升高,温度分布更均匀;将缩颈脱落后的熔滴看作椭圆,随熔滴在电弧等离子体中运动,熔滴尺寸逐渐接近圆形,熔滴在长轴方向尺寸变化较大,在短轴方向变化较小;与熔滴在长、短轴方向上的尺寸变化相比,熔滴的等效半径变化更小.
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| GB/T 7714 | 黄泽涵 , 韩绍华 , 薛丁琪 et al. 考虑温度场的MIG熔滴过渡行为数值模拟 [J]. | 兵器材料科学与工程 , 2021 , 44 (3) : 123-127 . |
| MLA | 黄泽涵 et al. "考虑温度场的MIG熔滴过渡行为数值模拟" . | 兵器材料科学与工程 44 . 3 (2021) : 123-127 . |
| APA | 黄泽涵 , 韩绍华 , 薛丁琪 , 顾天奇 . 考虑温度场的MIG熔滴过渡行为数值模拟 . | 兵器材料科学与工程 , 2021 , 44 (3) , 123-127 . |
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