A numerical model for deep penetration welding processes

Journal Article · Wed Dec 01 00:00:00 EST 1993 · Journal of Materials Engineering and Performance; (United States)

DOI:https://doi.org/10.1007/BF02645682· OSTI ID:5440677

Lambrakos, S G; Metzbower, E A; Moore, P G; Dunn, J H ^[1]; Monis, A ^[2]

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1. Naval Research Lab., Washington, DC (United States)
2. Univ. of Maryland, College Park, MD (United States)

The general features of a numerical model, and of its extensions, for calculating the temperature and fluid velocity field in a three-dimensional workpiece undergoing deep penetration laser beam welding are described. In the current model, the deposition of power from the beam is represented by time-dependent boundary conditions on the equations of energy and momentum transfer. These boundary conditions are specified at each timestep on a surface whose configuration can change with time and upon which energy is deposited according to a specified power distribution. This model also includes the effects of the buoyancy force on the melt pool and of the surface tension gradient on the surface of the fluid. The coupled equations of energy, momentum transfer, and continuity combined with the time-dependent boundary conditions representing the keyhole and the moving boundaries of the workpiece are solved by using a specific implementation of the SIMPLE algorithm. The important features of the numerical methods used in the model are discussed. Isotherms and convection patterns calculated using the current model are presented, and their significance for predicting weldment properties is discussed. A significant result of the simulations is that they demonstrate the overwhelming influence of the keyhole vapor/liquid interface on fluid convection and conduction in deep penetration welding.

• OSTI ID: 5440677
• Journal Information: Journal of Materials Engineering and Performance; (United States), Vol. 2:6; ISSN 1059-9495
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
LASER WELDING
MATHEMATICAL MODELS
ENERGY DEPOSITION
SPATIAL DISTRIBUTION
TEMPERATURE DISTRIBUTION
WELDED JOINTS
DISTRIBUTION
FABRICATION
JOINING
JOINTS
WELDING
360101* - Metals & Alloys- Preparation & Fabrication
990200 - Mathematics & Computers