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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)
j.
Finishing Welded Areas. Beads
should be ground or filed
smooth to match original
surface contours. Splatter
and flux should be removed by
scraping, chipping, and/or
grinding or filing. Welded
areas should be annealed if
required.
k.
Metallic Arc Welding. For
major or minor repair to
manganese-bronze propellers, a
covered aluminum-bronze
electrode composed of 90
percent copper and 10 percent
aluminum should be used.
Phosphorous bronze rods should
only be used for minor repairs,
as these rods have only about
one half the strength of the
base metal. Each edge of the
repair selections should be
beveled 45 degress (included
angle 90 degrees) and the root
of the bevel should be rounded
to a minimum 1/4 inch radius;
however, if the depth is over
1 inch, the sides can be
beveled at 15 degrees after
the width of the groove at
the top exceeds 1-1/2 inches.
The section to be repaired
should be chipped to sound
metal and positioned for
down-hand welding. Welds can
be made in the vertical
position; however, suitable
copper or carbon dams should
be used to aid in supporting
the weld metal. In order to
obtain a proper joint, it is
imperative that the base metal
be locally preheated. The
6-180
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