TM-9-2350-261-20-3
CARRIER, M113A2, M577A2, M1064, M1068, M1059 AND M901A1
TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL - VOLUME 3 OF 4
TM-9-2350-261-20-3 - Page 594 of 932
REPAIR HULL BY WELDING — Continued
WELDING NEAR MORTAR RING (M1064 ONLY)
CAUTION
Welding on area around mortar ring will cause turntable to bind.
1.
Do not weld on M1064 carriers in the area around mortar ring. The area extends from top of hull right through hull.
GENERAL WELDING INSTRUCTIONS
1.
Remove any parts that are in the way or may be damaged.
2.
Basic welding repairs are made on 5083 aluminum alloy using the MIG (Metal Inert Gas) welding method.
3.
Aluminum welds contract about 6 percent in volume when they become solid. Welding at a slow speed may cause too
much heating of the area around the weld. This will cause the metal to expand too much. It will then shrink too much
when it cools.
4.
Always use clean filler wire. Filler wire polluted by grease, oil, dust, or shop fumes causes porous welds. After welding,
cover wire and store in a warm, dry place.
5.
Always remove oxides, grease, oil films, paint, and all foreign matter from joint before welding. Wipe edges of joint
with clean cloth dipped in solvent and let dry before welding. Sand with disc sander or brush well with clean stainless
steel wire brush to remove oxide.
6.
Good joint fit-up makes welding easier, saves filler wire and gas, and results in higher quality welds. You must tack
weld to hold joint members in place if you do not have jigs. Tack welds should be small, neat, and placed to keep parts
aligned before and during welding.
7.
When welding unequal sections, direct arc against heavier piece to fuse the two edges evenly. Watch weld pool edge
rather than arc to make sure weld pool edges fuse right.
8.
When performing multipass welding, make sure edges of weld pool fuse right. Watch weld pool rather than arc. Any
oscillating or weaving motion should be slight, smooth, and slow. Brush material with clean, stainless steel wire brush
after each pass. On small weldments, lower amperage slightly after each pass if welding members become too hot.
9.
Clean up weld area and touch-up paint all bare metal. see TM 43-0139 and TB 43-0242.
10. Install any parts removed for access.
0575 00-4
0575 00
TM 9-2350-261-20-3
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