Effect of evaporation and temperature-dependent material properties on weld pool development
01 Apr 1991-Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science (American Institute of Mining, Metallurgical, and Petroleum Engineers)-Vol. 22, Iss: 2, pp 233-241
TL;DR: In this paper, the effect of weld pool evaporation and thermophysical properties on the development of the weld pool was evaluated using an existing computational model with and without vaporization effects and variable properties.
Abstract: This paper evaluates the effect of weld pool evaporation and thermophysical properties on the development of the weld pool. An existing computational model was modified to include vaporization and temperature-dependent thermophysical properties. Transient, convective heat transfer during gas tungsten arc (GTA) welding with and without vaporization effects and variable properties was studied. The present analysis differs from earlier studies that assumed no vaporization and constant values for all of the physical properties throughout the range of temperature of interest. The results indicate that consideration of weld pool vaporization effects and variable physical properties produce significantly different weld model predictions. The calculated results are consistent with previously published experimental findings.
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TL;DR: In this paper, a unified comprehensive model was developed to simulate the transport phenomena occurring during the gas metal arc welding process, where an interactive coupling between arc plasma; melting of the electrode; droplet formation, detachment, transfer, and impingement onto the workpiece; and weld pool dynamics all were considered.
287 citations
Additional excerpts
...For metal such as steel, qev can be written as [39] logðqevÞ 1⁄4 Av þ log P atm 0:5 log T ð19Þ...
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TL;DR: In this paper, the main emphasis is on thermal modelling and prediction of laser welding in metals, and a review is given over to the modelling of these processes where appropriate, where the time frame of the review is up to the year 2002.
Abstract: The main emphasis of this review is on thermal modelling and prediction of laser welding in metals. However as similar techniques are employed to model conventional welding processes such as arc, resistance and friction, as well as related processes such as alloying, cladding and surface hardening, part of this review is given over to the modelling of these processes where appropriate. The time frame of the review is up to the year 2002.
246 citations
TL;DR: In this paper, the authors investigated the complicated transport phenomena in spot hybrid laser-MIG keyhole welding and found that weld pool dynamics, cooling rate, and final weld bead geometry are strongly affected by the impingement process of the droplets in hybrid laser MIG welding.
151 citations
Cites background from "Effect of evaporation and temperatu..."
...The heat loss due to surface evaporation can be written as [30]...
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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).
134 citations
TL;DR: An integrated comprehensive 3D model has been developed to study the transport phenomena in gas metal arc welding (GMAW), including the arc plasma, droplet generation, transfer and impingement onto the weld pool, and weld pool dynamics as discussed by the authors.
106 citations
Cites background from "Effect of evaporation and temperatu..."
...For the metal of steel, qev can be expressed as [29]...
[...]
References
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Book•
23 Feb 1973
TL;DR: In this article, the authors introduce linear internal waves and herar flows in a stratified fluid and double-diffusive convection in stably stratified fluids, and show that the shear flows can produce turbulence.
Abstract: Preface 1. Introduction and preliminaries 2. Linear internal waves 3. Finite amplitude motions in stably stratified fluids 4. Instability and the production of turbulence 5. Turbulent shear flows in a stratified fluid 6. Buoyant convection from isolated sources 7. Convection from heated surfaces 8. Double-diffusive convection 9. Mixing across density interfaces 10. Internal mixing processes Bibliography and author index Recent publications Subject index.
2,722 citations
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01 Jan 1949
TL;DR: In this paper, the scientific foundations of the vacuum technique were discussed and the following papers were published: Scientific foundations of vacuum technique, Scientific foundations for vacuum technique and its application in computer vision.
Abstract: Scientific foundations of vacuum technique , Scientific foundations of vacuum technique , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
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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.
Abstract: A two-dimensional transient model for convective heat transfer and surface tension driven fluid flow is developed. The model describes the transient behavior of the heat transfer process of a stationary band source. Semi-quantitative understanding of scanning is obtained by a coordinate transformation. The non-dimensional forms of the equations are derived and four dimensionless parameters are identified, namely, Peclet number (Pe), Prandtl number (Pr), surface tension number(S), and dimensionless melting temperature(@#@ Tm
*
@#@). Their governing characteristics and their effects on pool shape, cooling rate, velocity field, and solute redistribution are discussed. A numerical solution is obtained and presented. Quantitative effects of Prandtl number and surface tension number on surface velocity, surface temperature, pool shape, and cooling rate are presented graphically.
294 citations