TM 55-2840-231-23
3-3.
Outer Combustion Case - Weld-Repair (AVIM)
INITIAL SETUP
Applicable Configuration
Consumable Materials
Al
l
Acetone (item 39, Appendix D)
Class 6 Weld Rod (item 40, Appendix D)
COMBUSTION
SECTION/
1. Outer Combus-
Weld-repair cracks in
tion Case
the outer combustion
case as follows. (See
the following figure.)
a. Remove surface con-
tamination using a
stainless steel wire
brush.
Acetone (item 39, Appendix D).
b. Clean the area with
acetone using a clean
cloth for the applica-
tion.
Class 6 weld rod (item 40, Appendix D).
c. Weld cracks using
inert gas arc and class
6 weld rod. Apply
1/8 inch (3.2 mm)
wide stringer bead using
medium heat input.
Cool each bead with
wet cloth immediately.
Do not apply another
bead until cool enough
to touch by hand.
d. To weld cracks in
butt weld areas (2A, 2B
and 3) back up the area
with a copper block and
argon gas back-up and
build up the area 1/32
inch (0.8 mm) minimum.
e. Inspect the weld for
undercut, cracking and
discontinuities. There
must be no evidence of
undercutting and crack-
ing.
3-4
