Results 11 to 20 of about 59,801 (212)

Multi-stage keyhole evolution in fiber laser welding: An experimental study and theoretical analysis

Results in Physics, 2021
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,
Shihui Guo, Jianglin Zou, Jiejie Xu, Qiang Wu, Rongshi Xiao   +4 more
doaj   +1 more source

Structural analysis of traditional Chinese hidden-keyhole padlocks [PDF]

Mechanical Sciences, 2018
Hidden-keyhole padlocks use a plate or some other means to cover the keyhole and are a category of traditional Chinese padlocks. The topological structures of traditional hidden-keyhole padlocks have distinct arrangements in the operation.
K.-H. Hsiao
doaj   +1 more source

Mechanism of keyhole pore formation in metal additive manufacturing

npj Computational Materials, 2022
During metal additive manufacturing, the porosity of the as-built part deteriorates the mechanical property and even hinders the further application of metal additive manufacturing.
Lu Wang, Yanming Zhang, Hou Yi Chia, Wentao Yan   +3 more
doaj   +1 more source

Preventing Evaporation Products for High-Quality Metal Film in Directed Energy Deposition: A Review

Metals, 2021
Directed energy deposition (DED), a type of additive manufacturing (AM) is a process that enables high-speed deposition using laser technology. The application of DED extends not only to 3D printing, but also to the 2D surface modification by direct ...
Kang-Hyung Kim, Chan-Hyun Jung, Dae-Yong Jeong, Soong-Keun Hyun   +3 more
doaj   +1 more source

Research on Arc Morphology and Keyhole Behavior of Molten Pool in Magnetically Controlled Plasma-GMAW Welding

Metals, 2023
In the magnetically controlled Plasma-GMAW welding process, the composite arc forms a keyhole in the workpiece to be welded. In order to explore the effect of process parameters on arc coupling, weld pool and keyhole, and the behavior characteristics of ...
Xinglin Miao, Hongtao Zhang, Fuchen Ge, Zhenyu He, Jianguo Gao, Zhaofang Su   +5 more
doaj   +1 more source

Photodissociation regions and star formation in the Carina Nebula [PDF]

, 2001
We have obtained wide-field thermal infrared (IR) images of the Carina Nebula, using the SPIREX/Abu telescope at the South Pole. Emission from poly-cyclic aromatic hydrocarbons (PAHs) at 3.29um, a tracer of photodissociation regions (PDRs), reveals many ...
Allamandola, Allamandola, Arendt, Brooks, Brooks, Brooks, Burton, Castets, Chan, Cohen, Cohen, Cohen, Cohen, Cox, Cox, de Graauw, Egan, Fowler, Gardner, Geballe, Genzel, Gooch, Grabelsky, Hasegawa, Hereld, Hollenbach, J. M. Rathborne, J. W. V. Storey, Joblin, Jones, K. J. Brooks, Lada, Léger, M. C. B. Ashley, M. Cohen, M. G. Burton, McGregor, Megeath, Meixner, Mill, Moutou, Panagia, Price, Price, Retallack, Sakamoto, Schneider, Scoville, Sellgren, Smith, Stutzki, Tauber, Tovmassian, Ulich, Verstraete, Wainscoat, Walborn, Walsh, Whiteoak, Whiteoak   +59 more
core   +2 more sources

Droplet Transfer Induced Keyhole Fluctuation and Its Influence Regulation on Porosity Rate during Hybrid Laser Arc Welding of Aluminum Alloys

Metals, 2021
Hybrid laser arc welding (HLAW) features advantages such as higher welding speed and gap tolerance as well as smaller welding deformation and heat-affected zone than arc welding.
Leilei Wang, Yanqiu Zhao, Yue Li, Xiaohong Zhan   +3 more
doaj   +1 more source

Mechanisms for Improvement of Weld Appearance in Autogenous Fiber Laser Welding of Thick Stainless Steels

Metals, 2018
High-power fiber laser welding is an efficient and effective way to produce heavy section structures. However, there is a significant challenge in producing the welds with free of imperfections such as nail-head-shaped welds, spatters, and root sagging ...
Mingjun Zhang, Shun Chen, Yingzhe Zhang, Genyu Chen, Zhuming Bi   +4 more
doaj   +1 more source

Numerical Study on the Influence of the Plasma Properties on the Keyhole Geometry in Laser Beam Welding

Frontiers in Physics, 2022
Keyhole laser welding is the benchmark for deep-penetration joining processes. It needs high incident laser beam power densities at the workpiece surface to take place. The gaseous phase plays a fundamental role to keep the deep and narrow keyhole cavity
Donato Coviello, Antonio D’Angola, Donato Sorgente   +2 more
doaj   +1 more source

Effect of laser-welding parameters on the heat input and weld-bead profile [PDF]

, 2005
Laser butt-welding of medium carbon steel was investigated using CW 1.5 kW CO2 laser. The effect of laser power (1.2 - 1.43 kW), welding speed (30 - 70 cm/min) and focal point position (-2.5 - 0 mm) on the heat input and the weld-bead geometry (i.e ...
A.G. Olabi, Allen, Benyounis, Dawes, Fuerschbach, Gunaraj, Gunaraj, Huang, K.Y. Benyounis, Khuri, Kim, M.S.J. Hashmi, Montgomery, Steen   +13 more
core   +1 more source