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Wednesday, April 26, 2006 - 11:10 AM
BSC17.4

Induction Brazing of Marine Thruster Rotors

R. A. G. Gourley, Curtiss Wright, Cheswick, PA

A development program to design and qualify an induction brazing process to join 268 electrolytic tough pitch (ETP) copper bars to a 39.50” ETP copper ring with a silver, copper, phosphorus braze alloy was created in lieu of torch brazing.  The torch brazing method was originally used to process this braze joint but was not able to adequately provide and maintain the necessary amount of heat to braze and prevent thermal distortion of the copper ring and the adjacent mating components.  Two EFD Induction, Inc. Minac 70/110 kW TWIN Power Output Units were used with four induction heating coils to braze the joint.  Upon completion of the qualification effort, destructive evaluation was performed on the brazed copper ring to determine that the braze process was metallurgically and mechanically acceptable.

Summary: A development program to design and qualify an induction brazing process to join 268 electrolytic tough pitch (ETP) copper bars to a 39.50” ETP copper ring with a silver, copper, phosphorus braze alloy was created in lieu of torch brazing.