Velocity and temperature fields, and shapes of the fusion zone in welding dissimilar metals are systematically investigated. Fluid flow in the molten pool is driven by the Marangoni force in different directions and magnitudes on the flat free surface. To interpret clearly without loss of generality, the three-dimensional quasi-steady welding is simulated by an unsteady two-dimensional process. Transport process on the maximum cross section of the molten region (or a cross section of the fusion zone) therefore is predicted. Interfaces between immiscible dissimilar metals and solid and liquid are, respectively, calculated by the volume of fluid and enthalpy methods. The computed results show different flow and thermal fields and molten regions of dissimilar metals as functions of dimensionless surface tension coefficients, viscosities, melting temperatures, and thermal conductivities of dissimilar metals and distinct phases, and beam power, welding speed, and the energy distribution parameter. The predicted shapes of fusion zones in welding pure irons, and aluminum to iron, agree with the experimental results.

Issue Section:
Heat Transfer in Manufacturing
Keywords:
Heat Transfer, Manufacturing, Phase Change, Thermocapillary
Topics:
Metals, Momentum, Welding, Shapes, Temperature, Aluminum, Enthalpy, Flow (Dynamics), Fluid dynamics, Fluids, Heat transfer, Iron, Manufacturing, Melting, Surface tension, Transport processes, Viscosity
1.
Ashgriz
N.
, and
Poo
J. Y.
,
1991
, “
FLAIR: Flux Line-Segment Model for Advection and Interface Reconstruction
,”
J. Computational Physics
, Vol.
93
, pp.
449
–
468
.
2.
Belton
G. R.
,
1976
, “
Langmuir Adsorption, the Gibbs Adsorption Isotherm, and Interfacial Kinetics in Liquid Metal Systems
,”
Metallurgical Transactions B
, Vol.
7B
, pp.
35
–
42
.
3.
Brent
A. D.
,
Voller
V. R.
, and
Reid
K. J.
,
1988
, “
Enthalpy-Porosity Technique for Modeling Convection-Diffusion Phase Change: Application to the Melting of a Pure Metal
,”
Numerical Heat Transfer
, Vol.
13
, pp.
297
–
318
.
4.
Cary, H. B., 1989, Modern Welding Technology, 2nd Ed., Prentice-Hall, Engle-wood Cliffs, NJ, pp. 555–559.
5.
DebRoy
T.
,
Basu
S.
, and
Mundra
K.
,
1991
, “
Probing Laser Induced Metal Vaporization by Gas Dynamics and Liquid Pool Transport Phenomena
,”
J. Applied Physics
, Vol.
70
, pp.
1313
–
1319
.
6.
Elmer
J. W.
,
Giedt
W. H.
, and
Eagar
T. W.
,
1990
, “
The Transition from Shallow to Deep Penetration during Electron Beam Welding
,”
Welding J.
, Vol.
69
, pp.
167s–176s
167s–176s
.
7.
Giedt
W. H.
,
Wei
X.-C.
, and
Wei
S.-R.
,
1984
, “
Effect of Surface Convection on Stationary GTA Weld Zone Temperatures
,”
Welding J.
, Vol.
63
, pp.
376s–383s
376s–383s
.
8.
Heiple
C. R.
, and
Roper
J. R.
,
1982
, “
Mechanism for Minor Element Effect on GTA Fusion Zone Geometry
,”
Welding J.
, Vol.
61
, pp.
97s–102s
97s–102s
.
9.
Hirt
C. W.
, and
Nichols
B. D.
,
1981
, “
Volume of Fluid (VOF) Method for the Dynamics of Free Boundaries
,”
J. Computational Physics
, Vol.
39
, pp.
201
–
225
.
10.
Kothe
D. B.
, and
Mjolsness
R. C.
,
1992
, “
Ripple: A New Model for Incompressible Flows with Free Surfaces
,”
AIAA J.
, Vol.
30
, pp.
2694
–
2700
.
11.
Kou
S.
, and
Wang
Y. H.
,
1986
, “
Weld Pool Convection and Its Effect
,”
Welding J.
, Vol.
65
, pp.
63s–70s
63s–70s
.
12.
Mills
K. C.
, and
Keene
B. J.
,
1990
, “
Factors Affecting Variable Weld Penetration
,”
International Materials Reviews
, Vol.
35
, pp.
185
–
216
.
13.
Nippes
E. F.
,
Pfluger
A. R.
, and
Slaughter
G. M.
,
1950
, “
Seam Welding Monel Metal to Steel
,”
Welding J.
, Vol.
29
, pp.
134s–139s
134s–139s
.
14.
Patankar, S. V., 1980, Numerical Heat Transfer and Fluid Flow, Hemisphere, New York, pp. 44–46, Chapter 6.
15.
Paul
A.
, and
DebRoy
T.
,
1988
, “
Free Surface Flow and Heat Transfer in Conduction Mode Laser Welding
,”
Metallurgical Transactions B
, Vol.
19B
, pp.
851
–
858
.
16.
Sahoo
P.
,
DebRoy
T.
, and
McNallan
M. J.
,
1988
, “
Surface Tension of Binary Metal-Surface Active Solute Systems under Conditions Relevant to Welding Metallurgy
,”
Metallurgical Transactions B
, Vol.
19B
, pp.
483
–
491
.
17.
Sen
A. K.
, and
Davis
S. H.
,
1982
, “
Steady Thermocapillary Flows in Two-dimensional Slots
,”
J. Fluid Mechanics
, Vol.
121
, pp.
163
–
186
.
18.
Seretsky
J.
, and
Ryba
E. R.
,
1976
, “
Laser Welding of Dissimilar Metals; Titanium to Nickel
,”
Welding J.
, Vol.
55
, pp.
208s–211s
208s–211s
.
19.
Sun
Z.
, and
Moisio
T.
,
1994
, “
Effect of Processing Parameters on Laser Welded Dissimilar Steel Joints
,”
Welding J.
, Vol.
73
, pp.
63
–
70
.
20.
Tinkler, M. J., Grant, I., Mizuno, G., and Gluck, C, 1983, “The Effects of Residual Impurity and Microalloying Elements on Weldability and Weld Properties,” paper 29, Abington, The Welding Institute.
21.
Unger
A. M.
,
1941
, “
Electro-Magnetic Stirring Action in a Spotweld
,”
Welding J.
, Vol.
20
, pp.
42
–
47
.
22.
Wei, P. S., and Chung, F. K., 1999, “Unsteady Marangoni Flow in Molten Pool When Welding Dissimilar Metals,” Metallurgical and Materials Transactions, submitted for publication.
23.
Wei, P. S., and Kuo, Y. K., 1998, “Fusion Zone Shapes in Electron-Beam Welding Dissimilar Metals,” ASME Journal of Heat Transfer, submitted for publication.
24.
Zacharia
T.
,
David
S. A.
,
Vitek
J. M.
, and
DebRoy
T.
,
1989
, “
Weld Pool Development during GTA and Laser Beam Welding of Type 304 Stainless Steel, Part I–Theoretical Analysis
,”
Welding J.
, Vol.
68
, pp.
499s–509s
499s–509s
.
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