Welding process

Electric heating – Metal heating – By arc

Reexamination Certificate

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C029S889100, C219S075000

Reexamination Certificate

active

06969826

ABSTRACT:
A process for repairing a compressor rear frame of a gas turbine engine. The process entails removing a seal flange from the inner casing wall of the frame to define an annular face on the casing wall, and fabricating a replacement flange to have an annular face with a radial width greater than the radial width of the annular face of the casing wall. The faces of the flange and wall are mated to form a joint, a penetration-enhancing flux is deposited adjacent the joint, and a single-pass gas tungsten arc welding operation is performed to form a root weldment that extends completely through the joint. The flux is then removed and a gas tungsten arc welding operation is performed to deposit a filler on the root weldment and form a second weldment that completely overlays but does not penetrate through the root weldment.

REFERENCES:
patent: 5400491 (1995-03-01), Yaworsky et al.
patent: 5804792 (1998-09-01), Paskell
patent: 6607114 (2003-08-01), Reser et al.
patent: 6664508 (2003-12-01), Johnson et al.
Edison Welding Institute, INSIGHTS Materials Joining Newsletter; Spring 2003, vol. 16, No. 2; “EWI Develops Full-Scale Riser Fatigue Test Facility in Columbus, Ohio”.

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