Results 261 to 270 of about 69,300 (308)

Weld defect formation in rail thermite welds

Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 2006
A previously developed heat transfer model is used to study the influence of welding parameters on weld defect development in thermite welds. Weld defect formation maps are constructed from a series of heat transfer simulations. For the current normal rail thermite welding conditions, it is found that shrinkage cavity formation can be avoided but cold-
Y Chen, F V Lawrence, C P L Barkan, J A Dantzig   +3 more
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Weld formation control for arc welding robot

The International Journal of Advanced Manufacturing Technology, 2008
The control of weld formation in gas tungsten arc welding is required for “teach and playback” robot to suit the gap variation in the multi-pass welding process. This paper presents a robotic system based on the real-time vision measurement. A close-loop control system is developed for weld formation control in backing welding. A novel prediction model
Shen Hongyuan, Huang Xixia, Lin Tao, Chen Shanben   +3 more
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Study of weld formation characteristics in laser-arc hybrid welding

International Journal of Modern Physics B, 2022
The laser-arc hybrid welding was carried out on the marine-use steel, and the effects of primary parameters on weld behavior were investigated. The results show that the weld penetration increased gradually with the increase of laser power. Meanwhile, superior weld formation, penetration and reinforcement were achieved when laser and wire distance was
Hongwei Sun, Zhidong Yang, Chenfu Fang, Yuntao Chen, Yongshun Zhang, Mingxiao Shi   +5 more
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Effect of welding speed on weld formation in electron beam welding with continuous penetration

Welding International, 2014
Investigations were carried out into the conditions of free formation of welded joints in electron beam welding in the flat position with continuous penetration, and also into the dynamic model of the discharge of liquid metal of the weld pool from the root in which the metal moves downwards at a higher speed in the initial stage; but during movement ...
Ye.V. Terentyev, V.K. Dragunov, A.P. Sliva, A.V. Scherbakov   +3 more
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Formation of Seam and Charge Welds in 2D Extrusion Welding

AIP Conference Proceedings, 2011
The conditions of extrusion welding when extruding through an empty or a filled die is investigated by experiment combined by FEA. An experimental grid pattern technique has been successfully applied to study metal flow in both cases. Finite element models have been created using Deform 2D and 3D.
Yawar Abbas Khan, Henry Valberg, Francisco Chinesta, Yvan Chastel, Mohamed El Mansori   +4 more
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The influence of metallurgy on the formation of welding aerosols

J. Environ. Monit., 2002
Recent research has indicated that insoluble ultrafine aerosols (ie., particles whose physical diameters are less than 100 nm) may cause adverse health effects due to their small size, and that toxicological response may be more appropriately represented by particle number or particle surface area.
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Wave formation in explosive welding

Journal of Applied Mechanics and Technical Physics, 1971
A hypothetical analogy between wave formation in explosive welding and the Karman vortex street is analyzed, and the physical laws of the wave formation process are investigated.
S. K. Godunov, A. A. Deribas, N. S. Kozin   +2 more
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Numerical simulation of the formation of hourglass welds during laser welding

Journal of Materials Processing Technology, 2019
Abstract The purpose of this study is to understand the effect of laser welding parameters on the formation of hourglass shaped welds in low carbon steel. Transient laser welding is modeled in ANSYS to simulate the coupled heat-transfer/fluid-flow behavior that produces corresponding hourglass shaped melt pool geometry.
Bon Seung Koo, Pornsak Thasanaraphan, Herman F. Nied   +2 more
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Experimental investigation of weld pool formation in electron beam welding

Vacuum, 1998
Abstract The energy transfer mechanism from an electron beam to a metal target, weld pool and keyhole of formation during electron beam welding was studied using a collector for secondary emitted particles, light photo diodes and CCD techniques. The physical processes in the welding pool and plasma cavity are discussed. It is shown that the nature of
Peter Petrov, Chavdar Georgiev, Georgy Petrov   +2 more
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Plasma formation in laser welding

Welding International, 2005
(2005). Plasma formation in laser welding. Welding International: Vol. 19, No. 10, pp. 808-813.
openaire   +1 more source