Computer modeling of arc welds to predict effects of critical variables on weld penetration Page: 1 of 21
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COMPUTER MODELING OF ARC WELDS TO PREDICT de92 000428
EFFECTS OF CRITICAL VARIABLES
ON WELD PENETRATION
T. Zacharia and S. A. David
With the advent of super-computers and powerful workstations, computational modeling
now plays a major role in many materials processing fields such as welding, casting,
forming, etc. The motivation for computational modeling is to reduce costs of process
development and improve process control. Prior to the widespread use of
computational modeling, most complex phenomena, which were analytically intractable,
could be addressed only by costly experimental approaches. A balanced approach,
combining experimental testing and computational modeling, has the potential of
providing significantly improved understanding of the process.
In recent years, there have been several attempts1'11 to study the effect of critical
variables on welding by computational modeling. It is widely recognized that
temperature distributions and weld pool shapes12 are keys to quality weldments. It
would be very useful to obtain relevant information about the thermal cycle experienced
by the weld metal, the size and shape of the weld pool, and the local solidification
rates, temperature distributions in the heat-affected zone (HAZ), and associated phase
The solution of moving boundary problems, such as weld pool fluid flow and
heat transfer, that involve melting and/or solidification is inherently difficult because the
location of the solid-liquid interface is not known a priori and must be obtained as a
part of the solution. Because of non-linearity of the governing equations, exact
analytical solutions can be obtained only for a limited number of idealized cases.
Therefore, considerable interest has been directed toward the use of numerical
Metals and Ceramics Division
Oak Ridge National Laboratory
Oak Ridge, TN - 37831
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Zacharia, T. & David, S.A. Computer modeling of arc welds to predict effects of critical variables on weld penetration, article, January 1, 1991; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc1071861/m1/1/: accessed April 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.