POTENTIAL HAZARDS When any of the welding processes are used, the molten puddle should be shielded from the air in order to obtain a high quality weld deposit. In shielded metal arc welding, shielding from the air is accomplished by gases produced by the disintegration of the coating in the arc. With gas shielded arc welding, shielding from the air
Read more →a. When welding is done near other personnel, screens should be used to protect their eyes from the arc or reflected glare. b. In addition to using portable screens to protect other personnel, screens should be used, when necessary, to prevent drafts of air from interfering with the stability of the arc. c. Arc welding operations give off an intense
Read more →a. When electric generators powered by internal combustion engines are used inside buildings or in confined areas, the engine exhaust must be conducted to the outside atmosphere.b. Check the welding equipment to make sure the electrode connections and the insulation on holders and cables are in good condition. All checking should be done with the machine off or unplugged. All
Read more →a. A shock hazard is associated with all electrical equipment, including extension lights, electric hand tools, and all types of electrically powered machinery. Ordinary household voltage (115 V) is higher than the output voltage of a conventional arc welding machine. b. Although the ac and dc open circuit voltages are low compared to voltages used for lighting circuits and motor
Read more →a. Do not allow hoses to come in contact with oil or grease. These will penetrate and deteriorate the rubber and constitute a hazard with oxygen. b. Always protect hoses from being walked on or run over. Avoid kinks and tangles. Do not leave hoses where anyone can trip over them. This could result in personal injury, damaged connections, or
Read more →a. Although the most familiar fuel gas used for cutting and welding is acetylene, propane, natural gas, and propylene are also used. Store these fuel gas cylinders in a specified, well-ventilated area or outdoors, and in a vertical condition.b. Any cylinders must have their caps on, and cylinders, either filled or empty, should have the valve closed. c. Care must
Read more →MAPP GAS CYLINDERS a. MAPP gas is a mixture of stabilized methylacetylene and propadiene. b. Store liquid MAPP gas around 70°F (21°C) and under 94 psig pressure. c. Repair any leaks immediately. MAPP gas vaporizes when the valve is opened and is difficult to detect visually. However, MAPP gas has an obnoxious odor detectable at 100 parts per million, a
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