Thermocapillary flow in a pulsed-laser weld pool
Pulsed-laser welding produces short-lived weld pools which have strong radial temperature gradients at the pool surface. These gradients produce surface tension variations which usually reinforce the weak natural convective flows caused by radial temperature gradients. The flow in the molten pool is of interest because it can change the temperature distribution in and around the molten zone which can alter the weld shape, and because it controls the transport of surface contaminants (or alloying or doping materials in case of surface processing) into the substrate. A two-dimensional finite difference computer code is being developed to model the transient flow in a prescribed axisymmetric weld pool geometry. Flow fields have been calculated for high and low Prandtl number metals such as steel and aluminum. Some experimental results are presented which support the computational model.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5329183
- Report Number(s):
- SAND-86-1726C; CONF-8610118-1; ON: DE86014111
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
420300* -- Engineering-- Lasers-- (-1989)
420400 -- Engineering-- Heat Transfer & Fluid Flow
ALGORITHMS
ALLOYS
ALUMINIUM
COMPUTERIZED SIMULATION
ELEMENTS
FABRICATION
FINITE DIFFERENCE METHOD
FLOW MODELS
FLOW RATE
FLUIDS
IRON ALLOYS
IRON BASE ALLOYS
ITERATIVE METHODS
JOINING
LASER WELDING
LASERS
LIQUID METALS
LIQUIDS
MATHEMATICAL LOGIC
MATHEMATICAL MODELS
METALS
NUMERICAL SOLUTION
SIMULATION
STEELS
TEMPERATURE GRADIENTS
TWO-DIMENSIONAL CALCULATIONS
WELDING