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激光焊接过程中残留液体金属的高速高倍在线观察温鹏1,获崎贤二1,山本元道1(1.北京市清华大学机械工程系)摘 要:采用高速摄像机和光学显微镜构成的摄像装置对激光焊接熔池后端的凝固行为进行高速高倍摄像,详细记录了柱状晶从液态熔池后部析出过程以及残留在已析出柱状晶周围的液体金属的凝固行为.采用液体Sn急冷将焊接过程中正在凝固的焊缝金属冷冻保存到室温,并与高速高倍摄像观察到的熔池后端的凝固行为进行了对比分析.对3种奥氏体不锈钢材料焊缝凝固过程中残留液体金属的存在范围进行了观察和比较.在线观察到的残留液体金属是焊缝金属......
, and high cooling rate of the mushy zone lead to the reduction in micro-segregation. The melting efficiency of ytterbium fiber laser for welding of Hastelloy C-276 of 64% is higher than that (48... substructure that constituted for lower micro-segregation was formed at the weld centerline. Key words: Hastelloy C-276 alloy; laser welding; fiber laser; micro-segregation 1 Introduction Hastelloy......
Repair welding process of friction stir welding groove defect LIU Hui-jie(刘会杰), ZHANG Hui-jie(张会杰) State Key Laboratory of Advanced Welding Production Technology, Harbin Institute...; Abstract: The groove defect formed in the friction stir welding dramatically deteriorates weld appearances and mechanical properties......
得穿透的焊接接头,焊接接头的强度约只有母材的88.5%,焊缝的断裂机制是塑性和脆性断裂的混合机制.由于在焊缝中存在一些Laves 颗粒,这促进了微裂纹和微孔的形成和扩展,降低了焊接接头的抗拉强度. 关键词:激光焊接;焊缝;组织;力学性能 中图分类号:TG 156;TN 249 文献标识码:A Laser welding... and microvoids and decreases the tensile strength of the welded joint. Key words: laser welding; weld; microstructure; mechanical properties  ......
in the T-shape laser welding joint was inspected by ultrasonic testing system adopting independent component analysis(ICA) theory to process the signals.The principle of automatic ultrasonic testing...Feasibility of differentiating defect signals of ultrasonic testing for laser weld based on independent component analysis theoryGUO Liwei,GANG Tie,and LI Jinquan State Key Laboratory of Advanced......
Parameter optimization of dissimilar resistance spot welding on ultra-high strength hot-stamped steel and mild steel by numerical simulationWen ZHENG 1),Min WANG 1),Liang KONG 1),Xuanting CHENG 2) and Ming LEI 3) 1) Shanghai Key Laboratory of Materials Laser Processing and Manufacture,Shanghai Jiao Tong University,Shanghai 200240,China 2) Shanghai Yirui Car Technology Co.,LTD,Shanghai......
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Trans. Nonferrous Met. Soc. China 29(2019) 692-700 Residual stress and welding distortion of Al/steel butt joint by arc-assisted laser welding-brazing Chun-ling LI, Ding FAN, Xiao-quan YU, Jian-kang...: The thermo-elastic-plastic finite element method (FEM) is used to simulate the thermo-mechanical behavior of Al/steel tungsten inert gas (TIG) arc-assisted laser welding-brazing (A-LWB) butt joint......
Laser Cladding of Cold-Work Tool Steel by Pulse ShapingMatej Pleterski1,Janez Tuek1,Ladislav Kosec31. Faculty of Mechanical Engineering, University of Ljubljana, Akereva cesta 63. Faculty of Natural Sciences and Engineering, University of Ljubljana, Akereva Cesta 12摘 要:Repair welding of cold-work tool steels in cold is very risky and almost......
resistance of laser-welded NiTi alloy could be attributed to almost complete dissolution of inclusions upon laser welding. Key words: NiTi alloy; shape memory alloy; laser welding; electrochemical behavior...) was used as a reference. 2 Experimental Ti-50.6%Ni plate, hot-rolled at 900℃ with thickness of 1.0 mm was used in this study. A Nd-YAG laser was used to perform the laser welding. Full-penetration bead......