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SAFETY | i | |||
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WARNING |
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PROTECT YOURSELF AND OTHERS FROM POSSIBLE SERIOUS INJURY OR DEATH. KEEP CHILDREN AWAY. PACEMAKER WEARERS SHOULD CONSULT WITH THEIR DOCTOR BEFORE OPERATING.
Read and understand the following safety highlights. For additional safety information, it is strongly recommended that you pur- chase a copy of “Safety in Welding & Cutting - ANSI Standard Z49.1” from the American Welding Society, P.O. Box 351040, Miami, Florida 33135 or CSA Standard
BE SURE THAT ALL INSTALLATION, OPERATION, MAINTENANCE AND REPAIR PROCEDURES ARE PER- FORMED ONLY BY QUALIFIED INDIVIDUALS.
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ELECTRIC SHOCK can kill.
1.a. The electrode and work (or ground) circuits are electrically “hot” when the welder or cutter is on. Do not touch these “hot” parts with your bare skin or wet clothing. Wear dry,
1.b. Insulate yourself from work and ground using dry insulation. Make certain the insulation is large enough to cover your full area of physical contact with work and ground.
In addition to the normal safety precautions, if welding or cutting must be performed under electrically hazardous conditions (in damp locations or while wearing wet clothing; on metal structures such as floors, gratings or scaffolds; when in cramped positions such as sitting, kneeling or lying, if there is a high risk of unavoidable or accidental contact with the workpiece or ground) use the following equipment:
•Semiautomatic DC Constant Voltage (Wire) Welder.
•DC Manual (Stick) Welder.
•AC Welder with Reduced Voltage Control.
1.c. In semiautomatic or automatic wire welding, the electrode, electrode reel, welding head, nozzle or semiautomatic welding gun are also electrically “hot”.
1.d. Always be sure the work cable makes a good electrical connection with the metal being welded. The connection should be as close as possible to the area being welded.
1.e. Ground the work or metal to be welded to a good electrical (earth) ground.
1.f. Maintain the electrode holder, work clamp, welding or cutting cable and welding or cutting machine in good, safe operating condition. Replace damaged insulation.
1.g. Never dip the electrode in water for cooling.
1.h. Never simultaneously touch electrically “hot” parts of electrode holders connected to two welders because voltage between the two can be the total of the open circuit voltage of both welders.
1.i. When working above floor level, use a safety belt to protect yourself from a fall should you get a shock.
1.j. Also see Items 4.c. and 6.
ARC RAYS can burn.
2.a. Use a shield with the proper filter and cover plates to protect your eyes from sparks and the rays of the arc when welding or cutting or observing open arc welding or cutting. Headshield and filter lens should conform to ANSI Z87. I standards.
2.b. Use suitable clothing made from durable
2.c. Protect other nearby personnel with suitable,
FUMES AND GASES can be dangerous.
3.a. Welding or cutting may produce fumes and gases hazardous to health. Avoid breathing these fumes and gases.When welding, or cutting keep your head out of the fume. Use enough ventilation and/or exhaust at the arc to keep fumes and gases away from the
breathing zone. When welding or cut- ting with electrodes which require special ventilation such as stainless or hard facing (see instructions on container or MSDS) or on lead or cadmium plated steel and other metals or coatings which produce highly toxic fumes, keep exposure as low as possible and below Threshold Limit Values (TLV) using local exhaust or mechanical ventilation. In confined spaces or in some circumstances, outdoors, a respirator may be required. Additional precautions are also required when welding on galvanized steel.
3.b. Do not weld or cut in locations near chlorinated hydrocarbon vapors coming from degreasing, cleaning or spraying operations. The heat and rays of the arc can react with solvent vapors to form phosgene, a highly toxic gas, and other irritating products.
3.c. Shielding gases used for arc welding or cutting can displace air and cause injury or death. Always use enough ventilation, especially in confined areas, to insure breathing air is safe.
3.d. Read and understand the manufacturer’s instructions for this equipment and the consumables to be used, including the material safety data sheet (MSDS) and follow your employer’s safety practices. MSDS forms are available from your welding distributor or from the manufacturer.
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3.e. Also see item 7b.