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SAFETY
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WELDING SPARKS can cause fire or explosion.
4.a. Remove fire hazards from the weld- ing area. If this is not possible, cover them to prevent the welding sparks from starting a fire. Remember that welding
sparks and hot materials from welding can easily go through small cracks and openings to adjacent areas. Avoid welding near hydraulic lines. Have a fire extinguisher readily available.
4.b. Where compressed gases are to be used at the job site, spe- cial precautions should be used to prevent hazardous situa- tions. Refer to “Safety in Welding and Cutting” (ANSI Standard Z49.1) and the operating information for the equip- ment being used.
4.c. When not welding, make certain no part of the electrode cir- cuit is touching the work or ground. Accidental contact can cause overheating and create a fire hazard.
4.d. Do not heat, cut or weld tanks, drums or containers until the proper steps have been taken to insure that such procedures will not cause flammable or toxic vapors from substances inside. They can cause an explosion even though they have been “cleaned”. For information, purchase “Recommended Safe Practices for the Preparation for Welding and Cutting of Containers and Piping That Have Held Hazardous Substances,” AWS F4.1 from the American Welding Society (see address above).
4.e. Vent hollow castings or containers before heating, cutting or welding. They may explode.
4.f. Sparks and spatter are thrown from the welding arc. Wear oil free protective garments such as leather gloves, heavy shirt, cuffless trousers, high shoes and a cap over your hair. Wear eat plugs when welding out of position or in confined places. Always wear safety glasses with side shields when in a weld- ing area.
4.g. Connect the work cable to the work as close to the welding area as practical. Work cables connected to the building framework or other locations away from the welding area increase the possibility of the welding current passing through lifting chains, crane cables or other alternate circuits. This can create fire hazards or overheat lifting chains or cables until they fail.
4.h. Also see item 7c.
CYLINDER may explode if damaged.
5.a. Use only compressed gas cylin- ders containing the correct shield- ing gas for the process used and properly operating regulators designed for the gas and
pressure used. All hoses, fittings, etc. should be suitable for the application and maintained in good condition.
5.b. Always keep cylinders in an upright position securely chained to an undercarriage or fixed support.
5.c. Cylinders should be located:
•Away from areas where they may be struck or subjected to physical damage.
•A safe distance from arc welding or cutting operations and any other source of heat, sparks, or flame.
5.d. Never allow the electrode, electrode holder or any other elec- trically “hot” parts to touch a cylinder.
5.e. Keep your head and face away from the cylinder valve outlet when opening the cylinder valve.
5.f. Valve protection caps should always be in place and hand tight except when the cylinder is in use or connected for use.
5.g. Read and follow the instructions on compressed gas cylin- ders, associated equipment, and CGA publication
FOR ELECTRICALLY pow- ered equipment.
6.a. Turn off input power using the dis- connect switch at the fuse box before working on the equipment.
6.b. Install equipment in accordance with the U.S. National Electrical Code, all local codes and the manufacturer’s rec- ommendations.
6.c. Ground the equipment in accordance with the U.S. National Electrical Code and the manufacturer’s recommendations.
SQUARE WAVE TIG 355
