Calculated transient two-dimensional Marangoni 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 code is being developed to model the transient flow in a prescribed axisymmetric weld pool geometry. A flux corrected transport algorithm is used with a vorticity-steamfunction formulation of the problem to calculate the flow field. Flow velocities during a typical laser pulse are presented for nickel and steel.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5101983
- Report Number(s):
- SAND-85-0225C; CONF-851125-1; ON: DE85010671
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
420300* -- Engineering-- Lasers-- (-1989)
420400 -- Engineering-- Heat Transfer & Fluid Flow
ALGORITHMS
ELEMENTS
FABRICATION
FINITE DIFFERENCE METHOD
FLOW MODELS
FLOW RATE
FLUIDS
ITERATIVE METHODS
JOINING
LASER WELDING
LASERS
LIQUID METALS
LIQUIDS
MATHEMATICAL LOGIC
MATHEMATICAL MODELS
MELTING POINTS
METALLURGY
METALS
NUMERICAL SOLUTION
PHYSICAL PROPERTIES
TEMPERATURE GRADIENTS
THERMODYNAMIC PROPERTIES
TRANSIENTS
TRANSITION TEMPERATURE
TWO-DIMENSIONAL CALCULATIONS
WELDING