TM 9-2350-277-20-4REPAIR HULL BY WELDING — Continued 0529 00c. Driver’s seat upholstered backrest.d. Trim vane rear pod.e. Trim vane front pod.f. All armor made of plastic molding material.WELDING NEAR MORTAR RING (M1064A3 ONLY)CAUTIONWelding on area around mortar ring will cause turntable to bind.1. Do not weld on M1064A3 carriers in the area around mortar ring. The area extends from top of hull right through hull.GENERAL WELDING INSTRUCTIONS1. 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 (Gas Metal Arc) welding method.3. Aluminum welds contract about 6 percent in volume when they become solid. Welding at a slow speed may cause toomuch heating of the area around the weld. This will cause the metal to expand too much. It will then shrink too muchwhen 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 jointwith clean cloth dipped in solvent and let dry before welding. Sand with disc sander or brush well with clean stainlesssteel wire brush to remove oxide.6. Good joint fitup makes welding easier, saves filler wire and gas, and results in higher quality welds. You must tack weldto hold joint members in place if you do not have jigs. Tack welds should be small, neat, and placed to keep parts alignedbefore and during welding.0529 00-4
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