TM 55–2840–254–23
Change 6 4–503
4–81 REPAIR EXIT VANE ASSEMBLY (Continued)
4–81
NOTE
In following step 3., use proper welding
procedure at all times (Ref. TM
1–1500–204–23–8).
3.
Using tungsten inert gas method, weld–re-
pair all cracks (6) in midspan shroud (7) if
any cracks in midspan shroud (7) exceeds in-
spection limits (Ref. Task 4–80).
WARNING
Power grinding is hazardous to per-
sonnel. Sparks and metal chips may
injure eyes. If injury occurs, get
medical attention.
a.
Wear goggles and rout cracks (6) to expose
clean, sound base metal. Use portable
electric drill and carbide burr.
b.
Clean chips, dirt, and oil from area to be
welded (Ref. Task 4–79).
NOTE
All welds in air flow path must be
blended smooth.
c.
Weld–repair. Use welding wire (E61). Do
not weld beyond inner shroud aft radius (5).
d.
Blend excess weld–repair with surrounding
parent metal. Use carborundum stone
(E10).
e.
Polish repaired area. Use crocus cloth
(E15).
f.
Fluorescent–penetrant inspect (per para-
graph 2–12.1.e) weld–repair area (Ref. TM
1–1500–335–23). There shall be no cracks.
If cracks are found, repeat steps a. through
e.
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