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Convection in arc weld pools
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In this paper, a mathematical model was developed to account for convection and temperature distributions in stationary arc weld pools driven by buoyancy, electromagnetic and surface tension forces, and it was shown that these forces dominate the flow behavior.Abstract:
A mathematical model was developed to account for convection and temperature distributions in stationary arc weld pools driven by buoyancy, electromagnetic and surface tension forces. It is shown that the electromagnetic and surface tension forces dominate the flow behavior. In some cases, these forces produce double circulation loops, which are indirectly confirmed by experimental measurements of segregation in the weld pool. It is also shown that the surface tension driven flows are very effective in dissipating the incident energy flux on the pool surface which, in turn, reduces the vaporization from the weld pool.read more
Citations
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Journal Article
Temperature fields produced by traveling distributed heat sources
Thomas W. Eagar,N. S Tsai +1 more
TL;DR: The solution of a traveling distributed heat source on a semi-infinite plate provides information about both the size and the shape of arc weld pools as mentioned in this paper, and the results indicate that both welding process variables (current, arc length and travel speed) and material parameters (thermal diffusivity) have significant effects on weld shape.
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Thermal modelling of laser welding and related processes: a literature review
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Impingement of filler droplets and weld pool dynamics during gas metal arc welding process
Y. Wang,Hai-Lung Tsai +1 more
TL;DR: In this paper, a mathematical model and associated numerical technique have been developed to simulate the dynamic impinging process of filler droplets onto the weld pool in spot gas metal arc welding (GMAW).
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Weld pool dynamics and the formation of ripples in 3D gas metal arc welding
J. Hu,H. Guo,Hai-Lung Tsai +2 more
TL;DR: In this article, the authors studied the transient weld pool dynamics under the periodical impingement of filler droplets that carry mass, momentum, thermal energy, and species in a moving 3D gas metal arc welding.
References
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Journal Article
Temperature fields produced by traveling distributed heat sources
Thomas W. Eagar,N. S Tsai +1 more
TL;DR: The solution of a traveling distributed heat source on a semi-infinite plate provides information about both the size and the shape of arc weld pools as mentioned in this paper, and the results indicate that both welding process variables (current, arc length and travel speed) and material parameters (thermal diffusivity) have significant effects on weld shape.
Journal Article
Mechanism for minor element effect on gta fusion zone geometry
Cr Heiple,Roper +1 more
TL;DR: In this paper, it is proposed that surface tension driven fluid flow (Marangoni convection) is responsible in many cases for the fluid flow pattern produced in weld pools and that minor elements change fluid flow patterns by altering the surface tension gradient.
Journal ArticleDOI
Analysis of Electrode Phenomena in the High-Current Arc
J. D. Cobine,E. E. Burger +1 more
TL;DR: In this article, the authors made an analysis of the phenomena at the electrodes of a high-current short-time arc and showed that the input power density to the anode spot is in the range 5×104 to 1×106 watts/cm2.
Journal ArticleDOI
A mathematical model for fluid flow in a weld pool at high currents
TL;DR: In this paper, the authors considered the flow of a viscous incompressible conducting fluid in a hemispherical container due to various distributions of the electric current and solved the problem numerically using the Du Fort-Frankel leap-frog method.
Unmixed zone formation in austenitic stainless steel weldments. [18 Cr-8 Ni weldments]
TL;DR: In this paper, the weld interface region in heterogeneous austenitic stainless steel weldments on an 18Cr-8Ni base metal was investigated and it was shown that a well-developed unmixed zone exists along the boundary separating the weld composite region from the partially-melted region.