Delphi Technologies, Inc.

Gerald A Machajewski

Henry E Beamer

James Anders

An improved method for producing a basic B tube configuration for a folded heat exchanger tube ( ). A braze clad metal strip ( ) having inner ( ) and outer ( ) surfaces and a opposed edges (12) is progressively formed over and in by a series of progressive roller stations ( A, A- J, J) until the lower edges ( ) on a pair of central abutting flanges centrally engage the strip inner surface ( ). Between two of the roller stations (G and H), a powered dispense valve ( ) with nozzle ( ) continuously dispenses a bead ( ) of material containing flux or, alternatively, flux and braze material. Bead ( ), rather than being a thin stripe, is a thick semi cylindrical shape, with substantial viscosity. As the flanges ( ) move into abutment and the downstream roller stations, the flange edges ( ) are forced down into the bead ( ), some of which is pumped up between the outer surfaces ( ) of the abutted flanges ( ), yielding a good, solid braze joint between the two.

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Lockport, NY, United States of America

Gerald A Machajewski