WARNING
ARC WELDING can be hazardous.
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 PERFORMED ONLY BY QUALIFIED INDIVIDUALS.
ELECTRIC SHOCK can kill.
1.a. The electrode and work (or ground) circuits are electrically “hot” when the welder 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 must be performed under electrically hazardous condi- tions (in damp locations or while wearing wet clothing; on metal structures such as floors, gratings or scaf- folds; when in cramped positions such as sitting, kneel- ing or lying, if there is a high risk of unavoidable or acci- dental contact with the workpiece or ground) use the fol- lowing 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 weld- ing gun are also electrically“hot”.
1.d. Always be sure the work cable makes a good electrical con- nection 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 cable and welding 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 elec- trode 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 observing open arc welding. 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 may produce fumes and gases haz- ardous to health. Avoid breathing these fumes and gases.When welding, keep your head out of the fume. Use enough ventila- tion and/or exhaust at the arc to keep fumes
and gases away from the breathing zone. When welding with electrodes which require special ventilation such as stainless or hard facing (see instructions on contain- er 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 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 prod- ucts.
3.c. Shielding gases used for arc welding can displace air and cause injury or death. Always use enough ventilation, espe- cially 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 employ- er’s safety practices. MSDS forms are available from your welding distributor or from the manufacturer.
3.e. Also see item 7b.
WELDING SPARKS can 
cause fire or explosion.
4.a..Remove fire hazards from the welding 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.
Apr. ‘93 |
