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9/27/01 AC 43.13-1B CHG 1 SECTION 6. WELDING AND BRAZING SAFETY 4-111. GENERAL. A number of inherent hazards exist in the use of oxy-fuel welding and cutting apparatus. It is necessary that proper safety and operating procedures are un derstood. A thorough understanding of the proper safety and operating procedures mini mizes the hazards involved and adds to the pleasure and efficiency of your work. 4-112. FIRE AND EXPLOSION SAFETY. Fires occur in welding areas because flamma bles are left where they can be ignited by welding sparks or gas welding flames. Before welding, clear the welding area of all flamma bles such as rags, paper, wood, paint cans, sol vent, and trash containers. Do not weld in ar eas where flammables are present. a. Unless absolutely necessary, never weld any tank or radiator that has had a flam mable in it, including gasoline, av-gas, motor oil, hydraulic fluid, or any other liquid that could ignite if the vapor and temperature reach a flashpoint. Explosions often occur when empty tanks are being welded or cut open with a torch. b. If welding such tanks or radiator cool ers is absolutely necessary, the tank must first be washed with a caustic-based, water-soluble liquid, rinsed with plenty of clear water, and then dried. Before welding, the tank or con tainer should be thoroughly purged with argon, or other inert gas, while the welding is in proc ess. 4-113. WELDING WORK AREA. a. The work area must have a fireproof floor, concrete floors are recommend. b. Use heat-resistant shields to protect nearby walls or unprotected flooring from sparks and hot metal. c. Maintain an adequate suction ventila- tion system to prevent the concentration of oxygen/fuel gas, flammable gases, and/or toxic fumes. It is important to remember that oxy gen will not burn. The presence of oxygen, however, serves to accelerate combustion, and causes materials to burn with great intensity. CAUTION: Oil and grease in the presence of oxygen can ignite and burn violently. d. A completely clean welding shop area with white walls, ceiling, and floor; and with plenty of light, is better for welding. The bet ter the lighting conditions, the easier it is to see the weld puddle and make excellent aircraft- quality welds. e. During oxy-fuel processes use work benches or tables with fireproof tops. Fire bricks commonly top these surfaces and sup port the work. f. Chain or otherwise secure oxygen and fuel gas cylinders to a wall, bench, post, cylin der cart, etc. This will protect them from fal ling and hold them upright. 4-114. FIRE PROTECTION. Practice fire prevention techniques whenever oxy-fuel op erations are in progress. Simple precautions prevent most fires, and minimize damage in the event a fire does occur. Always practice the following rules and safety procedures. Par 4-111 Page 4-81PDF Image | AFS-640
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