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学者姓名：肖荣诗
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摘要 ：
基于薄板激光焊失稳数值分析理论,建立了矩形栅格结构的激光点焊仿真模型,通过提取超薄板十字交叉结构激光点焊后固有应变的分布,在栅格结构面外失稳变形模型中计算得到十字交叉接头第一阶正特征值屈曲模态,表现为偏转变形.随着热输入的增大,接头的面外变形量明显增加,且偏转方向改变.对两种焊接顺序下的栅格结构进行特征值屈曲变形分析,发现焊接顺序1条件下第1层薄板接头处有明显的向下偏移,变形挠度为27μm.焊接顺序2下薄板的屈曲特征值较小,此时薄板的整体挠度增大.焊点个数的增多导致失稳变形更容易发生,具体表现为薄板的屈曲特征值持续下降,焊点附近屈曲变形的相互耦合作用会使栅格结构在中间层的面外变形量相比顶部和底部区域有明显增大.
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| GB/T 7714 | 张景祺 , 林健 , 雷永平 et al. 栅格结构激光焊接失稳有限元分析 [J]. | 航空制造技术 , 2021 , 64 (12) : 61-69 . |
| MLA | 张景祺 et al. "栅格结构激光焊接失稳有限元分析" . | 航空制造技术 64 . 12 (2021) : 61-69 . |
| APA | 张景祺 , 林健 , 雷永平 , 肖荣诗 , 李龙 , 宋征 . 栅格结构激光焊接失稳有限元分析 . | 航空制造技术 , 2021 , 64 (12) , 61-69 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
In this study, the relationship between melt flow and hump formation was directly revealed during laser deep penetration welding of transparent material. In partial-penetration welding, the melt flowed obliquely upwards along the bottom of the keyhole to the rear surface of the molten pool. And its flow rate increased first and then decreased with the increase of the welding speed. There was a one-to-one correspondence between the humps formed on the weld surface and the fluctuation of the inclination angle of the front keyhole wall (FKW) near the Brewster angle. The maximum eruption rate of the laser-induced vapor on the FKW exceeded 30 m/s. In full-penetration welding, the melt flow direction changed and humping was suppressed. The laser-induced vapor on the FKW surface can act on the rear keyhole wall, and this is the main reason for melt flow. When the inclination angle of the FKW is close to the Brewster angle, the amount of laser-induced evaporation on the FKW will increase to form a high speed jet of vapor which will drive melt flow in the molten pool behind the keyhole, and this is the main reason for hump formation on the rear surface of the molten pool.
关键词 ：
Front keyhole wall (FKW) Front keyhole wall (FKW) Hump Hump Laser welding Laser welding Molten pool Molten pool Vapor Vapor
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| GB/T 7714 | Zhu, Baoqi , Zhang, Gaolei , Zou, Jianglin et al. Melt flow regularity and hump formation process during laser deep penetration welding [J]. | OPTICS AND LASER TECHNOLOGY , 2021 , 139 . |
| MLA | Zhu, Baoqi et al. "Melt flow regularity and hump formation process during laser deep penetration welding" . | OPTICS AND LASER TECHNOLOGY 139 (2021) . |
| APA | Zhu, Baoqi , Zhang, Gaolei , Zou, Jianglin , Ha, Na , Wu, Qiang , Xiao, Rongshi . Melt flow regularity and hump formation process during laser deep penetration welding . | OPTICS AND LASER TECHNOLOGY , 2021 , 139 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
本发明公开一种纤维增强热塑性复合材料与金属激光压焊方法，涉及热塑性复合材料与金属连接技术领域，包括以下步骤：在待焊接金属的接头表面预制凸起结构；预先设定激光随焊压紧工作头的工作参数；在前滚轮压力的作用下，待焊接区的金属与热塑性复合材料形成紧密贴合；激光加热金属材料表面，使热塑性复合材料的热塑性树脂基熔融；在后滚轮的压力装置及超声振动装置的作用下，凸起结构嵌入热塑性复合材料中，熔融树脂基体流动扩散并填充金属表面，实现热塑性复合材料与金属的激光连接。本发明可以实现航空航天、汽车等领域中纤维增强热塑性复合材料与金属的大型三维结构件连接，有效抑制焊接缺陷的产生，保证焊接质量，提高焊接接头的力学性能。
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| GB/T 7714 | 徐洁洁 , 黄婷 , 肖荣诗 . 一种纤维增强热塑性复合材料与金属激光压焊方法 : CN202110132926.6[P]. | 2021-02-01 . |
| MLA | 徐洁洁 et al. "一种纤维增强热塑性复合材料与金属激光压焊方法" : CN202110132926.6. | 2021-02-01 . |
| APA | 徐洁洁 , 黄婷 , 肖荣诗 . 一种纤维增强热塑性复合材料与金属激光压焊方法 : CN202110132926.6. | 2021-02-01 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
纤维增强热塑性树脂基复合材料与金属的异质构件在轻量化现代装备中的应用日趋广泛,实现异质构件优质、高效、可靠的连接具有重要的学术意义和工程应用价值.详细综述了异质接头激光连接原理和界面结合机制,以及连接界面结合强度增强方法和激光连接工艺对连接接头抗剪强度的影响.通过增强机械结合和化学键结合,同时采用控制激光热输入、施加压力、填充树脂材料等措施抑制缺陷的产生,接头抗剪强度已可以满足工业应用对静载强度的要求.同时展望了纤维增强热塑性树脂基复合材料与金属激光连接技术的发展趋势.
关键词 ：
接头强度 接头强度 激光连接 激光连接 界面增强方法 界面增强方法 纤维增强热塑性树脂基复合材料 纤维增强热塑性树脂基复合材料 超快激光刻蚀 超快激光刻蚀
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| GB/T 7714 | 徐洁洁 , 王栋 , 肖荣诗 et al. 纤维增强热塑性树脂基复合材料与金属激光连接研究进展 [J]. | 焊接学报 , 2021 , 42 (10) : 73-86,102 . |
| MLA | 徐洁洁 et al. "纤维增强热塑性树脂基复合材料与金属激光连接研究进展" . | 焊接学报 42 . 10 (2021) : 73-86,102 . |
| APA | 徐洁洁 , 王栋 , 肖荣诗 , 黄婷 . 纤维增强热塑性树脂基复合材料与金属激光连接研究进展 . | 焊接学报 , 2021 , 42 (10) , 73-86,102 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Although laser welded Al?Li alloys show great potential for application in aerospace industry, the detailed relationship between local hardness and complex microstructure remained unclear. In the present study, relationship between precipitation behavior and local hardness in a defect-free laser pressure weld of Al?Li alloy 2198 was systematically examined by transmission electron microscopy. Hardness profile of the laser pressure weld was reduced in the vicinity of the weld center, mainly explained by size and density of the strengthening precipitates. Moreover, post-weld aging increased the density of strengthening precipitates in the precipitate dissolved regions, increasing their hardness values markedly. On the other hand, a few precipitates were formed in the precipitate-coarsened regions during post-weld aging, which slightly increased the local hardness. The variation in hardness during post-weld aging could be well correlated with the precipitation behavior in each region of the laser pressure weld.
关键词 ：
Al?Li alloy Al?Li alloy Artificial aging Artificial aging Hardness profile Hardness profile Laser pressure welding Laser pressure welding Microstructural characterization Microstructural characterization Precipitation sequence Precipitation sequence
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| GB/T 7714 | Zhao, Tianbo , Sato, Yutaka S. , Xiao, Rongshi et al. Hardness distribution and aging response associated with precipitation behavior in a laser pressure welded Al ? Li alloy 2198 [J]. | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2021 , 808 . |
| MLA | Zhao, Tianbo et al. "Hardness distribution and aging response associated with precipitation behavior in a laser pressure welded Al ? Li alloy 2198" . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 808 (2021) . |
| APA | Zhao, Tianbo , Sato, Yutaka S. , Xiao, Rongshi , Huang, Ting , Zhang, Jingquan . Hardness distribution and aging response associated with precipitation behavior in a laser pressure welded Al ? Li alloy 2198 . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2021 , 808 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Laser welding with high beam intensity generates a metal vapor, which partially displaces the metal melt, forming a narrow keyhole-shaped fusion zone. This study conducted theoretical analysis of the keyhole formation processes within fiber laser welding, based on three types of experimental observation. During the welding mode transition process, the keyhole formation was abrupt due to the jump-like absorptivity variation in the concave molten pool. In the primary stage of the laser keyhole welding process (when the laser was turned on), the keyhole depth grew rapidly and then slowed down before reaching a steady state. The keyhole formation time was related to the welding characteristic time (WCT), determined as the ratio of laser spot diameter to the welding speed. In the steady stage of fiber laser keyhole welding, the keyhole formation process was a periodic motion of the laser beam on the front keyhole wall (FKW). The periodic drilling occurred because the laser beam was irradiated on the FKW, with the inclination angle fluctuating around the Brewster angle.
关键词 ：
Drilling Drilling Fiber laser welding Fiber laser welding Keyhole Keyhole Melton pool Melton pool Welding characteristic time Welding characteristic time
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| GB/T 7714 | Guo, Shihui , Zou, Jianglin , Xu, Jiejie et al. Multi-stage keyhole evolution in fiber laser welding: An experimental study and theoretical analysis [J]. | RESULTS IN PHYSICS , 2021 , 31 . |
| MLA | Guo, Shihui et al. "Multi-stage keyhole evolution in fiber laser welding: An experimental study and theoretical analysis" . | RESULTS IN PHYSICS 31 (2021) . |
| APA | Guo, Shihui , Zou, Jianglin , Xu, Jiejie , Wu, Qiang , Xiao, Rongshi . Multi-stage keyhole evolution in fiber laser welding: An experimental study and theoretical analysis . | RESULTS IN PHYSICS , 2021 , 31 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Dissimilar joining of CFRP and conventional metal attracts tremendous interest due to the increased usage of CFRP in the aerospace industry. However, until now, laser joining of CFRP to metal is commonly performed with low welding velocity (<20 mm/s), which limits its practical applications due to the low joining efficiency. In this work, both experiments and simulations were conducted. The defect-free CFRP/AA2060 laser joint was achieved with a laser power of 5 kW and a welding velocity of 110 mm/s. Compared with the Gaussian laser beam, a rectangular beam spot was obtained using an integrated mirror in the present study. The rectangular beam spot provided a relatively uniform energy density, thus offering a uniform temperature distribution at the CFRP/ AA2060 interface, minimizing the porosity defect as well as exhibiting the high shear force. More importantly, the CFRP/AA2060 joints were achieved over a wide range of joining parameters, indicating superior adaptability of the laser joining CFRP to metals with the rectangular beam spot.
关键词 ：
Al-Li alloy Al-Li alloy CFRP CFRP Laser joining Laser joining Numerical simulation Numerical simulation
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| GB/T 7714 | Wang, Dong , Xu, Jiejie , Huang, Ting et al. Effect of beam shaping on laser joining of CFRP and Al-Li alloy [J]. | OPTICS AND LASER TECHNOLOGY , 2021 , 143 . |
| MLA | Wang, Dong et al. "Effect of beam shaping on laser joining of CFRP and Al-Li alloy" . | OPTICS AND LASER TECHNOLOGY 143 (2021) . |
| APA | Wang, Dong , Xu, Jiejie , Huang, Ting , Jing, Ruomu , Zhang, Jingquan , Xiao, Rongshi . Effect of beam shaping on laser joining of CFRP and Al-Li alloy . | OPTICS AND LASER TECHNOLOGY , 2021 , 143 . |
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摘要 ：
Industrial application of copper often requires a joining. Unfortunately, a commercial laser welding of this material is challenging due to extremely high reflectivity of copper at the near-infrared wavelength. In this work, the sound copper joints were produced at relatively high welding speed of 15 m/min by using a pressure-assisted fiber-laser welding. It was theoretically shown that the material melting arisen from a convergence of multiple reflections of the laser beam. By using electron backscatter diffraction (EBSD), it was found that microstructural changes were induced by a laser-induced thermal effect as well as a roller-induced pressure. It was deduced that the molten material solidified before feeding to the pressure rolls and thus it experienced a notable plastic strain during the welding process. The present work provides an effective method for commercial joining of high-reflective metals by using the near-infrared fiber laser.
关键词 ：
Copper Copper Laser welding Laser welding Microstructure Microstructure Weld formation mechanism Weld formation mechanism
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| GB/T 7714 | Zhang, Jingquan , Huang, Ting , Mironov, Sergey et al. Laser pressure welding of copper [J]. | OPTICS AND LASER TECHNOLOGY , 2021 , 134 . |
| MLA | Zhang, Jingquan et al. "Laser pressure welding of copper" . | OPTICS AND LASER TECHNOLOGY 134 (2021) . |
| APA | Zhang, Jingquan , Huang, Ting , Mironov, Sergey , Wang, Dong , Zhang, Qingwei , Wu, Qiang et al. Laser pressure welding of copper . | OPTICS AND LASER TECHNOLOGY , 2021 , 134 . |
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摘要 ：
铝合金对近红外光纤激光反射率高,激光能量利用率低,目前通常采用"万瓦级"光纤激光实现铝合金的高速激光焊接.文中采用激光压力焊接的方法,实现了铝合金"千瓦级"光纤激光的高速焊接.研究了不同工艺参数下焊缝的成形性,计算了激光能量的汇聚规律,并利用电子背散射衍射技术(EBSD)对焊缝微观结构进行表征.结果表明,激光功率为1～6 kW、焊接速度为5～20 m/min时均可实现焊接.当激光功率为6 kW时,焊接速度可达50 m/min.计算结果证明,激光压力焊接方法具有显著的能量汇聚作用,功率密度最大可达到原始聚焦激光束的4.6倍,提高了激光能量的利用率.通过对焊缝微观组织的表征进一步证明,激光能量汇聚作用实现了材料的快速熔化凝固,随后在压力作用下,填充了搭接间隙.
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| GB/T 7714 | 张景泉 , 黄婷 , 王栋 et al. 铝合金光纤激光高速压力焊接 [J]. | 焊接学报 , 2021 , 42 (4) : 20-27 . |
| MLA | 张景泉 et al. "铝合金光纤激光高速压力焊接" . | 焊接学报 42 . 4 (2021) : 20-27 . |
| APA | 张景泉 , 黄婷 , 王栋 , 武强 , 徐洁洁 , 肖荣诗 . 铝合金光纤激光高速压力焊接 . | 焊接学报 , 2021 , 42 (4) , 20-27 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Femtosecond laser has been widely utilized for modification of crystal structure to achieve desired functions. So far, however, the effect of crystallographic orientation on the induced structure by femtosecond laser processing has yet been comprehensively studied. The present work is undertaken in an attempt to fill this gap in our knowledge. To this end, commercial-purity Si is used as a target material and high-resolution transmission electron microscopy as well as electron backscatter diffraction are applied to examine the irradiation-induced microstructural changes. The structural response of the pulsed material is found to be principally influenced by the crystallographic orientation of the target surface. Specifically, at the surface orientation close to {111}, a pronounced amorphization effect is observed whereas no disordered material is detected at the orientations close to {100}. This phenomenon could be explained by the lowest crystallization speed required by the (111) surface due to its smallest surface energy. Compared with nanosecond laser, non-thermal melting induced by femtosecond laser induces mild thermal gradient and favors recrystallization.
关键词 ：
Amorphization Amorphization Crystallographic orientation Crystallographic orientation Femtosecond laser Femtosecond laser Silicon Silicon
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| GB/T 7714 | Zhang, Xin , Zhang, Liang , Mironov, Sergey et al. Effect of crystallographic orientation on structural response of silicon to femtosecond laser irradiation [J]. | APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING , 2021 , 127 (3) . |
| MLA | Zhang, Xin et al. "Effect of crystallographic orientation on structural response of silicon to femtosecond laser irradiation" . | APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING 127 . 3 (2021) . |
| APA | Zhang, Xin , Zhang, Liang , Mironov, Sergey , Xiao, Rongshi , Guo, Liang , Huang, Ting . Effect of crystallographic orientation on structural response of silicon to femtosecond laser irradiation . | APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING , 2021 , 127 (3) . |
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