Results 341 to 350 of about 204,518 (380)
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The influence of metallurgy on the formation of welding aerosols
J. Environ. Monit., 2002Recent 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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A statistical model of crack formation in welds
Engineering Fracture Mechanics, 1984Abstract It is shown that an exponential distribution of defect depth follows from the results of a Monte Carlo simulation and from combinatorical arguments, if the formation of cracks in welds is considered as a random process. Simple relations between the model parameters, the parameter of the exponential distribution function and the expected ...
Brueckner, A., Munz, D.
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Weld defect formation in FSWed coppers
Journal of Materials Engineering and Performance, 2014This work was undertaken to explore the formation of weld defects in FSWed copper metals via both numerical and experimental approaches. The 4 mm-thick copper sheets were friction stir welded at a tool rotational speed of 710 rpm and tool translational speed of 40 mm/min. Microstructural evaluations were performed on the welded specimens.
Hamed Pashazadeh +3 more
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Formation of primary particles in welding fume
Journal of Aerosol Science, 2013Abstract The formation of primary particles in the welding fume with regard to gas phase ionization is studied. It is shown that the classical theory is applicable only to the initial moment of condensation of the metals' vapors. The fast coagulation of nuclei leads to the formation of droplets which can unrestrictedly grow and get charged.
S.A. Kiro, A.A. Ennan, V.I. Vishnyakov
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Predictions of metal droplet formation in arc welding [PDF]
Proceeding of Progress in Plasma Processing of Materials 1997, 1996 A two-dimensional time-dependent model has been developed for the prediction of droplet formation in gas metal arc welding. The model is a unified treatment of the arc, the welding wire, taken as the anode, and the workpiece, taken as a plane cathode.
J Haidar, John J. Lowke
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Microstructural formation in longitudinal bicrystal welds
Metallurgical Transactions A, 1993The formation and selection processes in dendritic microstructures that occur during the welding of two differently oriented Fe-15 wt pct Ni-15 wt pct Cr single-crystal pieces were analyzed. The specimens were oriented by X-ray diffraction and cut along precise crystallographic orientations in order to weld specific surfaces in a manner that joined two
Stan A David +4 more
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Formation of thermoelectric currents in weld pools
CLEO/Europe. 2005 Conference on Lasers and Electro-Optics Europe, 2005., 2006The aim of this presentation is to point to the possible origins of thermoelectric currents and to calculate the current distribution in different materials as iron and aluminium on the base of an analytical solution of the problem. As the current distribution is known, the resulting Lorentz force for a static magnetic field is discussed with respect ...
Eckhard Beyer, A. Lange
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The mechanics of wave formation in explosive welding
Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1967Strong bonds can be produced by the explosive welding process and usually the weld interface has a characteristic wavy form. In this paper the mechanism of explosive welding is discussed, the present theories of wave formation are critically examined and a new mechanism of wave formation is proposed.
Bernard Crossland +2 more
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The chemistry of TIG weld bead formation
Welding International, 2015TIG welding has high levels of stability and permits more refined control than the majority of other arc welding processes. However, it is well known that small changes in the chemical composition of the base metal and arc operating region can have a pronounced effect on the resulting weld bead shape, which reduces the ability to control and predict ...
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Influence of Welding Current on Formation of Weld Bead in TIG Welding for Joining Thin Plates
Advanced Engineering Forum, 2018In this paper, a new (novel) welding technology has been applied to join 0.1 mm thin plates. An initial study on the influence of welding current on the welding properties for stainless steel SUS304 plates is discussed in this paper. The weld bead appearance on both top surface and bottom surface was observed by microscope to indicate the change of ...
Murata Tadasuke +4 more
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