Method for repairing a damaged blade of a Blisk

Details Method for repairing a damaged blade of a Blisk Method for repairing a damaged blade of a Blisk

2007-07-31

2007-07-31

Bryant, David P. (Department: 3726)

Metal working

Method of mechanical manufacture

Impeller making

C029S402130, C029S402160, C029S402180

Reexamination Certificate

active

10853050

ABSTRACT:
A BLISK having a damaged blade, with a repair region that has a thickness less than a specified thickness as a result of damage during manufacture or prior service, is repaired by depositing repair metal onto the repair region to increase its thickness to greater than its specified thickness dimension. Only the repair region is stress relieved by heating the repair region to a stress-relieving temperature of from about 1150° F. to about 1250° F. for a time of at least about 1 hour. The intentional manipulation of microstructure in only the thinner airfoil sections allows multiple repairs, which are not possible in the thicker sections of the BLISK. An alpha-case thickness of repair metal, preferably of at least about 0.0002 inches of repair metal, is removed from a surface of the repair region.

REFERENCES:
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patent: 6536110 (2003-03-01), Smith et al.
patent: 6568077 (2003-05-01), Hellemann et al.
patent: 2002/0195176 (2002-12-01), Smith et al.

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