Metal fusion bonding – Process – Plural joints
Reexamination Certificate
2009-02-17
2011-12-20
Stoner, Kiley (Department: 1735)
Metal fusion bonding
Process
Plural joints
C228S190000, C228S221000
Reexamination Certificate
active
08079508
ABSTRACT:
A brazed aluminum counter-flow heat exchanger particularly suited for use in Ocean Thermal Energy Conversion is produced by assembling and welding subassemblies of corrugated fins that were previously vacuumed brazed in a stacked group. After the brazing operation, the stacked group of subassemblies are later separated and rearranged to create a subsequent stack of alternating layers of corrugated layers and layers having wide open saltwater passageways. To complete the unit, a friction stir welding process provides final exterior weld seams that penetrate to the internal saltwater passageways in the heat exchanger. The full weld penetration eliminates corrosion-conducive crevices at the welded joints, thus making the aluminum heat exchanger suitable for saltwater use.
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Harter Robert J.
Stoner Kiley
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