Journal ArticleDOI
Three-dimensional convection in laser melted pools
Sindo Kou,Y. H. Wang +1 more
TLDR
In this paper, computer simulation was carried out to describe three-dimensional convection in laser melted pools, i.e., for the case where the workpiece is moving with respect to the laser beam.Abstract:
Computer simulation was carried out to describe three-dimensional convection in laser melted pools,i.e., for the case where the workpiece is moving with respect to the laser beam. Two different types of driving forces for flow were considered in the model,i.e., the buoyancy force and the surface tension gradient at the pool surface. Laser surface melting of 6063 aluminum alloy was carried out using a continuous-wave CO2 laser, and the power delivered to the workpiece was measured calorimetrically. The calculated and observed fusion boundaries were compared and very good agreement was obtained. Finally, the effect of the surface tension temperature coefficient δγ/δT on the convection pattern and penetration of laser melted pools was demonstrated with the model.read more
Citations
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Journal ArticleDOI
Current issues and problems in laser welding of automotive aluminium alloys
TL;DR: In this paper, a review of the available research on the laser welding of 5xxx, 6xxx, and some 2xxx series automotive aluminium alloys is critically examined and interpreted from different perspectives.
Journal ArticleDOI
A Simple but Realistic Model for Laser Cladding
TL;DR: In this article, a model which takes into account the main phenomena occurring during the laser-cladding process is proposed, where the laser power reaching the surface of the workpiece is estimated and, assuming this power is used to remelt the substrate with the clad having been predeposited, the melt-pool shape is computed using a three-dimensional (3-D) analytical model.
Journal ArticleDOI
Weld metal composition change during conduction mode laser welding of aluminum alloy 5182
Hailiang Zhao,Tarasankar Debroy +1 more
TL;DR: In this paper, a comprehensive model for the calculation of vaporization rate and weld metal composition change was developed based on the principles of transport phenomena, kinetics, and thermodynamics.
Journal ArticleDOI
Revealing internal flow behaviour in arc welding and additive manufacturing of metals
Lee Aucott,Hongbiao Dong,Wajira Mirihanage,Robert Atwood,Anton Kidess,Anton Kidess,Shian Gao,Wen Shuwen,John Marsden,Shuo Feng,Mingming Tong,Mingming Tong,Thomas Connolley,Michael Drakopoulos,Chris R. Kleijn,Ian Richardson,David J. Browne,Ragnvald H. Mathiesen,Helen V. Atkinson,Helen V. Atkinson +19 more
TL;DR: Direct time-resolved imaging of melt pool flow dynamics from a high-energy synchrotron radiation experiment is presented to show surface tension affects flow speed, orientation and surface turbulence.
Journal ArticleDOI
Numerical prediction of fluid flow and heat transfer in welding with a moving heat source
TL;DR: In this paper, an improved computational analysis is presented for the detailed prediction of heat transfer, phase change, and fluid flow during welding with a moving heat source, where the governing equations are formulated in a reference frame attached to the heat source.
References
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Journal ArticleDOI
Chemistry and physics
TL;DR: Corresponding lecture and laboratory courses numbered below 400 must be scheduled concurrently unless prior credit has been received for either the lecture or the laboratory.
Journal ArticleDOI
A two-dimensional transient model for convection in laser melted pool
C. Chan,J. Mazumder,M. M. Chen +2 more
TL;DR: In this paper, a two-dimensional transient model for convective heat transfer and surface tension driven fluid flow is developed, which describes the transient behavior of the heat transfer process of a stationary band source.
Journal ArticleDOI
Fluid flow and weld penetration in stationary arc welds
Sindo Kou,D. K. Sun +1 more
TL;DR: In this article, a computer simulation of weld pool fluid flow and its effect on weld penetration was carried out, with three driving forces for fluid flow being considered: the buoyancy force, the electromagnetic force, and the surface tension gradient at the weld pool surface.
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