REPAIR HULL BY WELDING Continued - TM-9-2350-247-20-3

REPAIR HULL BY WELDING Continued - TM-9-2350-247-20-3_141

REPAIR HULL BY WELDING Continued - TM-9-2350-247-20-3_143

TM-9-2350-247-20-3 Carrier Cargo Tracked 6 Ton M548A12350010969356 (EIC: AEU) M548A3 2350013696081 (EIC: AE9) Manual
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TM 9-2350-247-20-3 REPAIR HULL BY WELDING — Continued 0406 00 WARNING Welding on foam-filled parts is PROHIBITED. Toxic fumes can result in death. 10. Do not weld or use too much heat in areas or carrier where sealing compound (WP 0542 00, Item 33), (WP 0542 00, Item 36), or (WP 0542 00, Item 38) has been applied or is known to exist. If you must weld in these areas, remove compound then clean area with cleaning compound (WP 0542 00, Item 9). After welding, apply new sealing compound (WP 0542 00, Item 36), or (WP 0542 00, Item 38) a. Foam-filled parts: Driver’s compartment doors. MAGNESIUM CASTING, FILING, AND GRINDING WARNING Do not use water or foam-type extinguishers. These types of extinguishers will intensify a magnesium fire. 1. Observe special safety precautions when filing or grinding magnesium castings. Fine particles of magnesium are a fire hazard. See (page 0406 00-3) for a list of magnesium castings used on this carrier. Use the following precautions when working with or near magnesium. a. Use grinding equipment marked FOR MAGNESIUM GRINDING ONLY. b. Do not allow magnesium dust or magnesium dust mixtures to accumulate. Keep area clean. c. Keep tools used to work magnesium sharp. d. Dispose of grinding sludge immediately. e. Wear leather or smooth, fire-retardant clothing; brush frequently. f. Keep fire extinguisher for magnesium handy. MIG WELDING METHOD 1. MIG (Metal Inert Gas) Welding. This process uses a dc power source, control panel, and a welding gun. the gun feeds a consumable bare electrode at a given rate into a molten pool beneath a blanket of protective inert gas. When an arc is set up, a molten pool forms at once. Move the welding gun along the joint line at a rate that shapes the right size bead. The covering of inert gas keeps air from polluting the weld zone. No flux is needed. 2. Contraction and Expansion. Aluminum welds contract about 6 percent in volume when they become solid after being melted. Welding at a slow speed may cause too much heating of the area around weld. This will cause the metal to expand too much. It will then shrink too much when it cools. 3. Filler wire: 0406 00-4

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