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学者姓名：黄婷
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<正>2023年10月27日第十九届北京激光技术前沿论坛在北京工业大学知新园学术报告厅隆重开幕,本次学术论坛由北京光学学会与中国光学光电子行业协会、中国光学学会激光加工专业委员会、固体激光技术重点实验室、北京工业大学科协、北京工业大学理学部联合主办,旨在把握激光技术发展前沿和热点、共享研究成果,促进我国激光光电子技术的科技创新与合作,为与会者搭建高水平交流平台。本刊从论坛选取了北京工业大学黄婷研究员、中国科学院空天信息创新研究院李捷研究员、中国电子科技集团公司第十一研究所眭晓林研究员的分享报告整理为笔谈,以飨读者。
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| GB/T 7714 | 黄婷 , 李捷 , 眭晓林 . 第十九届北京激光技术前沿论坛笔谈 [J]. | 北京工业大学学报 , 2024 , (07) : 1-8 . |
| MLA | 黄婷 等. "第十九届北京激光技术前沿论坛笔谈" . | 北京工业大学学报 07 (2024) : 1-8 . |
| APA | 黄婷 , 李捷 , 眭晓林 . 第十九届北京激光技术前沿论坛笔谈 . | 北京工业大学学报 , 2024 , (07) , 1-8 . |
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Abstract ：
Significance In recent years, notable progress has been made in the development of equipment components aimed at precision and miniaturization. These miniature components typically exhibit complex geometries. They are composed of diverse materials. Further miniaturization of these components has led to an increased demand for precision welding. Consequently, the assembly of small parts and the packaging of devices require increasingly high levels of connection accuracy and quality control. High-quality micro-welding technologies for metallic materials have important applications in aerospace, power batteries, biomedicine, and other fields. For instance, micro electro mechanical systems (MEMS), characterized by feature sizes ranging from 1 mu m to 1 mm, are commonly packaged using micro-welding technology. Moreover, power battery electrode foils, with thicknesses as low as 6-12 mu m, require precise connections for current export. Furthermore, the assembly of components and metal shell sealing in implantable biomedical devices rely heavily on micro-welding technology. Common micro-welding techniques include resistance micro spot welding, ultrasonic micro-welding, micro tungsten inert gas(TIG) welding, and laser micro-welding. Compared with conventional micro-welding methods, laser micro-welding offers several advantages, including a small focusing spot size, precise heat input control capability, high welding speed, and compatibility with various weldable materials. Progress This study investigates the laser micro-welding technology of metal materials, providing a comprehensive analysis of its significance, microscale effects, welding modes, laser selection, and defect and quality control measures. It is difficult to reach a consensus on a precise definition of laser micro-welding. The connotations of laser micro-welding are comprehensively summarized based on previously reported studies. Strictly speaking, laser micro-welding pertains to a laser welding process where at least one feature size of the connected material or weld is less than 100 mu m. Laser micro-welding involves two welding modes: conduction and penetration welding. In laser micro-welding, oxidation promotes fluctuations in the penetration-welding process, resulting in a transient phase. Subsequently, the influence of microscale effects is introduced. When workpiece dimensions are reduced to the micron scale, typical microscale effects occur. The physical characteristics observed during laser micro-welding, such as heat transfer and molten pool flow, differ from those observed during macro-welding (Fig.2). Based on microscale effects, the defects and quality control measures in laser micro-welding are summarized according to the process parameters. Welding defects such as lack of penetration, burn-through, spatter, humping, porosity, and cracking can occur during the laser micro-welding process, and optimization of the welding process parameters is an important means of controlling weld formation and welding defects. These parameters include the laser wavelength, laser power, spot diameter of the laser, pulse laser parameters, welding speed, and scanning path. Furthermore, the applications of laser micro-welding to both similar and dissimilar metal materials are reviewed. Laser micro-welding is used to join precision components in the electronics, automotive, aerospace, and medical industries (Fig.12). Notable applications include pressure sensors, bipolar plates for fuel cells, aerospace engine blades, electronic component pins, copper-printed circuit boards, satellite collimator components, cardiac pacemakers, and lithium-ion battery tabs. Finally, the challenges and future development directions of laser micro-welding technology for metallic materials are summarized, including the welding mechanism of metal and non-metallic materials, new process technology, and laser micro-welding systems. Conclusions and Prospects The characteristics of laser micro-welding are complex owing to microscale effects. Although laser micro-welding has been widely used for connecting metal materials, some challenges remain. First, there is a burgeoning demand for the joining of dissimilar materials, including the micro-welding of dissimilar metals and metal/non-metallic materials. Dissimilar materials with different physical properties pose significant challenges in welding. Second, increasing the welding speed is important for improving the production rate. However, humping occurs at high welding speeds. To address this, process innovation and the recombination of multiple energy fields are required to further increase the critical speed of humping by controlling the flow characteristics of the molten pool and the solidification process during micro-welding. This is essential for improving the production rates and ensuring the product yield in high-speed welding. Finally, the development of intelligent laser micro-welding systems is a key future trend. The use of an intelligent laser micro-welding system has the potential to improve weld quality and welding efficiency
Keyword ：
application application laser technique laser technique laser micro welding laser micro welding metal foil metal foil scale effect scale effect process parameters process parameters
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| GB/T 7714 | Du, Weizhe , Huang, Xuting , Zheng, Min et al. Research Progress in Laser Micro-welding of Metal Materials (Invited) [J]. | CHINESE JOURNAL OF LASERS-ZHONGGUO JIGUANG , 2024 , 51 (4) . |
| MLA | Du, Weizhe et al. "Research Progress in Laser Micro-welding of Metal Materials (Invited)" . | CHINESE JOURNAL OF LASERS-ZHONGGUO JIGUANG 51 . 4 (2024) . |
| APA | Du, Weizhe , Huang, Xuting , Zheng, Min , Xiao, Rongshi , Huang, Ting . Research Progress in Laser Micro-welding of Metal Materials (Invited) . | CHINESE JOURNAL OF LASERS-ZHONGGUO JIGUANG , 2024 , 51 (4) . |
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Abstract ：
设备器件精密化、微型化是工业发展的重要趋势。在航空航天、动力电池、消费电子、生物医疗等应用领域中，零部件的日益微型化对微加工工艺提出了更高的要求。金属材料微焊接是微加工领域的重要需求之一，而激光具有能量密度高、热输入精确可控、焊接变形小等特点，是金属材料微焊接的重要技术手段。对金属材料激光微焊接技术展开了探讨，明确了其内涵，阐明了微尺度效应的影响，并总结了激光微焊接常见的缺陷及其质量控制方法，介绍了同种金属材料和异种金属材料激光微焊接的重要应用前景。最后，指出了金属材料激光微焊接技术存在的问题，并展望了未来的发展方向。
Keyword ：
工艺参数 工艺参数 激光微焊接 激光微焊接 应用 应用 激光技术 激光技术 尺度效应 尺度效应 金属箔材 金属箔材
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| GB/T 7714 | 杜伟哲 , 黄旭霆 , 郑敏 et al. 金属材料激光微焊接研究进展（特邀） [J]. | 中国激光 , 2024 , 51 (04) : 68-84 . |
| MLA | 杜伟哲 et al. "金属材料激光微焊接研究进展（特邀）" . | 中国激光 51 . 04 (2024) : 68-84 . |
| APA | 杜伟哲 , 黄旭霆 , 郑敏 , 肖荣诗 , 黄婷 . 金属材料激光微焊接研究进展（特邀） . | 中国激光 , 2024 , 51 (04) , 68-84 . |
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激光表面织构化作为提高异质结构接头剪切性能的有效手段，已广泛应用于碳纤维增强复合材料（CFRP与金属材料激光连接领域中。采用波长515 nm的飞秒激光在2060铝锂合金表面制备微结构，采用能量密度分布均匀的矩形光斑实现CFRP和2060铝锂合金异质接头的高速光纤激光连接，探讨飞秒激光刻蚀深度、扫描线间距对异质结构接头剪切强度的影响规律。结果表明，通过飞秒激光织构化处理，异质接头剪切强度得到了大幅提升，接头破坏形式均为界面断裂和基体断裂的混合断裂模式。在激光功率5 kW、焊接速度高达3.6 m/min条件下，接头平均剪切强度可达35.7 MPa，是未经飞秒激光织构化接头的2.3倍。
Keyword ：
2060铝锂合金 2060铝锂合金 剪切强度 剪切强度 碳纤维增强复合材料(CFRP) 碳纤维增强复合材料(CFRP) 飞秒激光织构化 飞秒激光织构化 激光连接 激光连接
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| GB/T 7714 | 王栋 , 徐洁洁 , 黄婷 et al. 飞秒激光表面织构化对CFRP/2060铝锂合金高速激光连接接头剪切性能的影响 [J]. | 航空制造技术 , 2024 , 67 (05) : 89-94,102 . |
| MLA | 王栋 et al. "飞秒激光表面织构化对CFRP/2060铝锂合金高速激光连接接头剪切性能的影响" . | 航空制造技术 67 . 05 (2024) : 89-94,102 . |
| APA | 王栋 , 徐洁洁 , 黄婷 , 景若木 , 张景泉 , 肖荣诗 . 飞秒激光表面织构化对CFRP/2060铝锂合金高速激光连接接头剪切性能的影响 . | 航空制造技术 , 2024 , 67 (05) , 89-94,102 . |
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A bendable electrode is an essential component of flexible electronics. The resistance stability against deformation is highly desired for practice. In this work, a bendable Cu electrode is fabricated by femtosecond laser direct writing (FsLDW), involving photothermal reduction of Cu ions and deposition of Cu on polyethylene terephthalate (PET) substrate. A highly conductive Cu electrode with a sheet resistance of 0.56 Omega & sdot; sq - 1 is obtained, which is improved by at least one order of magnitude over previous works. It is worth noting that the sheet resistance of the Cu electrode almost remains unchanged after 6000 downward bending cycles at a bending angle of 30 degrees and shows a slight increase after 10 adhesion tests, demonstrating excellent bending stability and adhesive strength. The porous morphology of the deposited Cu may relieve bending stress, resulting in high deformation resistance. The temperature field simulation confirms sufficient heat accumulation during FsLDW for Cu ion reduction and PET surface melting, allowing for Cu embedding on the PET surface and improving adhesion between the Cu electrode and the substrate.
Keyword ：
Flexible stability Flexible stability Bendable electrode Bendable electrode Femtosecond laser direct writing Femtosecond laser direct writing Temperature field simulation Temperature field simulation
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| GB/T 7714 | Xing, Lingrong , Cui, Mengya , Zhou, Zheng et al. Femtosecond laser direct writing of highly conductive copper for bendable electrodes with excellent bendability [J]. | JOURNAL OF MANUFACTURING PROCESSES , 2024 , 123 : 13-19 . |
| MLA | Xing, Lingrong et al. "Femtosecond laser direct writing of highly conductive copper for bendable electrodes with excellent bendability" . | JOURNAL OF MANUFACTURING PROCESSES 123 (2024) : 13-19 . |
| APA | Xing, Lingrong , Cui, Mengya , Zhou, Zheng , Xiao, Rongshi , Huang, Ting . Femtosecond laser direct writing of highly conductive copper for bendable electrodes with excellent bendability . | JOURNAL OF MANUFACTURING PROCESSES , 2024 , 123 , 13-19 . |
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Laser direct writing (LDW) is a promising approach for fabricating metallic micropatterns on transparent substrates for transparent electronic circuits that satisfy both electronic and optical criteria. However, high efficiency and precision patterning remain a challenge for both photochemical and photothermal LDW. Here, a novel method is proposed with a femtosecond laser to achieve a highly-efficient photothermal process via single-photon absorption by photosensitive particles (SPA-FsLDW). The dispersive photosensitive particles act as numerous heating sources, enabling simultaneous multiple-location photothermal reactions and highly-efficient metallization due to heat-induced metal ion reduction. The new approach effectively exploits the excellent heat-input regulation with the ultrashort pulse of the femtosecond laser to achieve great temperature controllability and precision. It is shown that, with a deposition rate of approximate to 10(7) mu m(3) s(-1) and electrical resistivity of approximate to 10(-7) omega m, SPA-FsLDW improves efficiency and electrical resistivity by at least one order of magnitude compared to previously reported FsLDW. A self-powered sensor is fabricated using SPA-FsLDW, demonstrating its practical applicability.
Keyword ：
metallic micropatterns metallic micropatterns high-efficiency high-efficiency laser direct writing laser direct writing femtosecond laser femtosecond laser
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| GB/T 7714 | Cui, Mengya , Huang, Ting , Peng, Zeyu et al. High-Efficiency and Low-Intensity Threshold Femtosecond Laser Direct Writing of Precise Metallic Micropatterns on Transparent Substrate [J]. | ADVANCED MATERIALS TECHNOLOGIES , 2023 , 8 (8) . |
| MLA | Cui, Mengya et al. "High-Efficiency and Low-Intensity Threshold Femtosecond Laser Direct Writing of Precise Metallic Micropatterns on Transparent Substrate" . | ADVANCED MATERIALS TECHNOLOGIES 8 . 8 (2023) . |
| APA | Cui, Mengya , Huang, Ting , Peng, Zeyu , Xing, Lingrong , Zhou, Zheng , Guo, Liang et al. High-Efficiency and Low-Intensity Threshold Femtosecond Laser Direct Writing of Precise Metallic Micropatterns on Transparent Substrate . | ADVANCED MATERIALS TECHNOLOGIES , 2023 , 8 (8) . |
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Abstract ：
飞秒激光以其超窄脉宽和超高光强等特性被广泛应用于各种金属材料的加工。本课题组采用波长为515 nm的绿光飞秒激光器对GH3230镍基高温合金进行刻蚀试验，研究了GH3230高温合金的绿光飞秒激光刻蚀阈值、刻蚀率和极限刻蚀深度。结果表明：相比于红外飞秒激光，绿光飞秒激光的刻蚀阈值明显降低，刻蚀率显著提高；与红外飞秒激光刻蚀类似，随着刻蚀次数增加，刻蚀深度增大，但当刻蚀次数增加到一定值后，刻蚀深度出现饱和现象；激光能量密度越高，极限刻蚀深度越大；改变扫描策略进行双道刻蚀时，通过增加刻缝宽度可以增大刻蚀深度；激光诱导等离子体是影响刻蚀深度的主要因素。
Keyword ：
飞秒激光加工 飞秒激光加工 刻蚀深度 刻蚀深度 激光技术 激光技术 刻蚀阈值 刻蚀阈值 刻蚀率 刻蚀率 镍基高温合金 镍基高温合金
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| GB/T 7714 | 黄彩丽 , 蒋麒 , 蔺晓超 et al. GH3230高温合金绿光飞秒激光的刻蚀特性 [J]. | 中国激光 , 2023 , 50 (08) : 59-65 . |
| MLA | 黄彩丽 et al. "GH3230高温合金绿光飞秒激光的刻蚀特性" . | 中国激光 50 . 08 (2023) : 59-65 . |
| APA | 黄彩丽 , 蒋麒 , 蔺晓超 , 杨诗瑞 , 郭鹏 , 崔梦雅 et al. GH3230高温合金绿光飞秒激光的刻蚀特性 . | 中国激光 , 2023 , 50 (08) , 59-65 . |
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Abstract ：
为了研究不同工艺参数对TC4钛合金与连续编织碳纤维增强聚醚醚酮基复合材料（CFPEEK）的激光焊接接头的影响规律，并对焊接工艺窗口进行预测，使用ABAQUS软件建立基于热传导的有限元仿真模型，计算TC4钛合金/CFPEEK激光焊接接头的温度场分布。针对CFPEEK中连续编织碳纤维的实际铺层情况，在建模时对复合材料进行分层处理，将碳纤维层视为正交性质的材料。在此基础上探究了激光功率、焊接速度、光斑尺寸对焊缝熔化深度及宽度的影响规律，计算结果与实际试验结果吻合度较高，激光功率、焊接速度、光斑尺寸等工艺参数均对接头结合处的温度有较大影响。经过多组参数的计算，得到了TC4钛合金/连续编织CFPEEK激光连接的预测工艺窗口。结果表明，所建立的有限元模型能够有效模拟连续编织CFPEEK与TC4钛合金激光连接的温度场分布，对实际试验有一定指导意义，可降低试验成本。
Keyword ：
激光技术 激光技术 TC4钛合金 TC4钛合金 数值模拟 数值模拟 激光连接 激光连接 碳纤维增强复合材料 碳纤维增强复合材料
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| GB/T 7714 | 景若木 , 徐洁洁 , 肖荣诗 et al. 碳纤维增强复合材料与钛合金激光连接仿真 [J]. | 中国激光 , 2023 , 50 (08) : 9-19 . |
| MLA | 景若木 et al. "碳纤维增强复合材料与钛合金激光连接仿真" . | 中国激光 50 . 08 (2023) : 9-19 . |
| APA | 景若木 , 徐洁洁 , 肖荣诗 , 黄婷 . 碳纤维增强复合材料与钛合金激光连接仿真 . | 中国激光 , 2023 , 50 (08) , 9-19 . |
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Abstract ：
厚膜正极能够显著提高电池的面积比容量,从而满足实际应用需求.然而,电极厚度增加使锂离子的扩散受到限制,导致倍率性能降低,这是目前亟待解决的关键问题.使用515 nm波长飞秒激光在厚度为100 μm的NCM811正极表面制备3D结构,研究了飞秒激光刻蚀工 艺参数对刻蚀形貌的影响及刻蚀微结构特征尺寸对NCM811厚膜正极电化学性能的影响规律.研究结果表明:绿光飞秒激光刻蚀仅改变NCM811形貌,对其物相组成无明显影响;相比沟槽结构,网格结构既可提供充足的通道促进锂离子的扩散,又可避免正极材料的过度损耗.在高倍率3 C下,织构化网格正极质量比容量和面积比容量分别为92 mA·h/g和1.37mA·h/cm2,显著高于原始正极比容量(27 mA·h/g和0.58 mA·h/cm2),实现了 NCM811厚膜正极倍率性能的提升.
Keyword ：
激光刻蚀 激光刻蚀 厚膜电极 厚膜电极 飞秒激光 飞秒激光 锂离子电池 锂离子电池 激光技术 激光技术
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| GB/T 7714 | 李松原 , 曹利 , 王京博 et al. 锂离子电池NCM811厚膜正极飞秒激光织构化工艺研究 [J]. | 中国激光 , 2023 , 50 (12) : 237-244 . |
| MLA | 李松原 et al. "锂离子电池NCM811厚膜正极飞秒激光织构化工艺研究" . | 中国激光 50 . 12 (2023) : 237-244 . |
| APA | 李松原 , 曹利 , 王京博 , 肖荣诗 , 黄婷 . 锂离子电池NCM811厚膜正极飞秒激光织构化工艺研究 . | 中国激光 , 2023 , 50 (12) , 237-244 . |
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Abstract ：
Laser micro-welding differs from macro-welding in that at least one dimension of the weld is less than 100 mu m. Although process research on laser micro-welding has recently made some progress, the influence of welding mode on microstructure and corrosion resistance has remained unknown, which has been shown to have a significant influence on laser macro-welding. In this work, a single-mode fiber laser equipped with a scanning galvanometer is used to weld AISI304 stainless steel foils with a thickness of 100 mu m. Similar to laser macro -welding, keyhole formation is used to describe two welding modes, namely thermal conduction welding and penetration welding. The laser-material interaction experiences a transient phase in which the welding mode alternates between conduction welding and penetration welding as reported by previous work. However, we show that gas protection eliminates the transient phase, proving that the transient phase develops as a result of the unsteadiness of the penetration welding caused by oxidation during the welding process. The crystallographic texture and phase constitution vary between conduction and penetration welds due to variations in heat transfer behavior during welding. The conduction weld has greater sigma 3 CSL boundaries and a more uniform micro-structure than the penetration weld, resulting in better corrosion resistance.
Keyword ：
Welding mode Welding mode Laser micro-welding Laser micro-welding Corrosion resistance Corrosion resistance Microstructure Microstructure
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| GB/T 7714 | Du, Weizhe , Xu, Jiejie , Xiao, Rongshi et al. Laser micro-welding of stainless steel foil: Welding mode, microstructure and corrosion properties [J]. | OPTICS AND LASER TECHNOLOGY , 2023 , 161 . |
| MLA | Du, Weizhe et al. "Laser micro-welding of stainless steel foil: Welding mode, microstructure and corrosion properties" . | OPTICS AND LASER TECHNOLOGY 161 (2023) . |
| APA | Du, Weizhe , Xu, Jiejie , Xiao, Rongshi , Huang, Ting . Laser micro-welding of stainless steel foil: Welding mode, microstructure and corrosion properties . | OPTICS AND LASER TECHNOLOGY , 2023 , 161 . |
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