| Brazing Research
Fundamental Research in Modeling of Brazing Processes
Fundamentals of Molten Metal Microlayer Flows
 |
Cladding
layer residue formed following
molten cladding flow into the joint zone at
peak brazing temperature AA4343/AA3003.
Residue thickness is around 20 microns. |
Research Team
Principal Investigator:
Research Team:
- Dr. J. Morris, CMD
- Dr. Alan Male, Center for Manufacturing
- Larry Walker, ORNL, HTML
- Zhao Hui, Research Assistant, Ph.D. candidate, Center for Manufacturing & DME
- Gao Feng, Research Assistant, Ph. D. candidate, Center for Manufacturing & HIT
- R. Anderson, Center for Manufacturing
- Undergraduate students
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AA3003/AA4343
at
300 K EPMA map |
Scope
The research activities within the scope of this program seek
for fundamental understanding and modeling of molten cladding flow
at peak brazing temperature prior to joint formation.
 |
AA3003/AA4343
at
793 K EPMA map |
The main objective of modeling is to predict the outcomes of the brazing
process when the history of the process parameters is known. This
research is sponsored by a NSF
research grant NSF #DMI-9908319. The research goals involve theoretical
(analytical and numerical) and experimental studies. The theoretical
approach includes scaling analysis of the governing equations and
boundary conditions that describe mass, momentum, and energy transfers
during a reactive flow of molten metal over a metal substrate.
 |
After
Brazing-T joint zone,
Temp. 878 K, and dwell
time 5 min. 793 K EPMA map |
Experimental studies involve the real time monitoring of the cladding
flow, the metallographic studies of brazed coupons and complex geometry
samples, interface phenomena (in particular diffusion of Si and Mn
at the atomic level), etc.
 |
AA3003/AA4343
at
843 K EPMA map |
An extensive study of cladding residue formed prior to and during
the molten metal flow phase involves various SEM (EDS), EPMA (Micro
probe) and other electron and optical microscopy studies. The topics
of research interest are joint formation, substrate erosion and liquid
eutectic penetration, alpha phase formation, and various other interface
phenomena. Materials involve aluminum composites such as AA4343/3003.
In all these efforts, emphasize is on modeling and uncovering deterministic
links between various process parameters and the outcomes of the process.
Back to Fundamental
Research in Modeling of Brazing Processes
Back to Brazing Research Program
About
Dr. Dusan P. Sekulic
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