Computer modeling of arc welds to predict effects of critical variables on weld penetration
In recent years, there have been several attempts to study the effect of critical variables on welding by computational modeling. It is widely recognized that temperature distributions and weld pool shapes 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 transformations. 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 methods to obtain time-dependant solutions for theoretical models that describe the welding process. Numerical methods can be employed to predict the transient development of the weld pool as an integral part of the overall heat transfer conditions. The structure of the model allows each phenomenon to be addressed individually, thereby gaining more insight into their competing interactions. 19 refs., 6 figs., 1 tab.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5344879
- Report Number(s):
- CONF-9110226-1; ON: DE92000428
- Resource Relation:
- Conference: 7. annual North American welding research (NAWR) conference, Columbus, OH (United States), 2-4 Oct 1991
- Country of Publication:
- United States
- Language:
- English
Similar Records
Plasma transferred arc repair welding of the nickel-base superalloy IN-738LC
Hardness Prediction by Incorporating Heat Transfer and Molten Pool Fluid Flow in a Multi-pass, Multi-layer Weld for Onsite Repair of Grade 91 steel
Related Subjects
GAS TUNGSTEN-ARC WELDING
MATHEMATICAL MODELS
CONVECTION
FLUID FLOW
HEAT AFFECTED ZONE
HEAT TRANSFER
SOLIDIFICATION
ARC WELDING
ENERGY TRANSFER
FABRICATION
GAS METAL-ARC WELDING
JOINING
MASS TRANSFER
PHASE TRANSFORMATIONS
WELDING
ZONES
360101* - Metals & Alloys- Preparation & Fabrication