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 TM 55-1905-221-14-3
6-16
PROPELLER, PROPELLER SHAFT, AND STUFFING BOX (Continued)
LOCATION/ITEM
ACTION
REMARKS
REPAIR (Cont)
m. Multiple-Layer Gas Welding.
The multiple-layer gas
welding method is an approved
for major and minor repairs
of propellers. The edges to
be welded are beveled to
form a 75 degree, single
V-groove weld for thickness
less than 1-1/2 inches. A
75 degree double V-groove is
used if the thickness of the
section is greater than
1-1/2 inches (3.81 cm). A
copper-zinc, low- fuming,
welding rod of the proper
size and in accordance with
Military Specification
MIL-R-19631 is used with a
suitable brazing flux for
repair of manganese-bronze
propellers. A carefully
adjusted oxidizing flame is
essential for sound welds.
A forehand method of welding
should be used and the weld
metal deposited in beads
with limited oscillation not
exceeding 1-1/2 times the
diameter of the welding
rod:
p. Welding-Preheat and Stress
Relief. Because copper-zinc
alloys are susceptible to
stress-corrosion or season
cracking, stress must be
relieved, as the propeller
can crack after being
returned to service. The
use of local preheat above
400 (204 ), preferably
F
C
6-182
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