Technique for direct bonding cast and wrought materials

Details Technique for direct bonding cast and wrought materials Technique for direct bonding cast and wrought materials

1992-10-02

1993-12-28

Vo, Peter Dungba

Metal working

Method of mechanical manufacture

Impeller making

2940207, 2940213, 228194, B23K 3102

Patent

active

052728099

ABSTRACT:
A method is taught for joining a wrought alloy material to a cast alloy, so as to obtain a joint having superior structural integrity. A cast nickel-base superalloy part may be bonded to a wrought nickel-base superalloy part, for example, by positioning a suitable part or blank of said wrought superalloy adjacent to the cast superalloy part, applying a local bonding force to the interface while locally heating the interface to a temperature which causes localized softening, metal flow, and bonding, removing said bonding force, and subjecting the bonded assembly to a local or isothermal heat treatment so as to minimize distortion, optimize properties, and stress relieve the bonded assembly. This method may be used, for example, for the repair or replacement of vane assembly retaining lugs, whereby a replacement lug of a wrought alloy is solid state bonded to the vane assembly in place of the previous retaining lug.

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