Return to Master TOC
Return to Master TOC
Return to Master TOC
Return to Master TOC
ii | SAFETY |
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| ELECTRIC SHOCK can kill. |
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| ARC RAYS can burn. |
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| 3.a. The electrode and work (or ground) circuits |
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| 4.a. Use a shield with the proper filter and cover | |||||||
| are electrically “hot” when the welder is on. |
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| plates to protect your eyes from sparks and | ||||||||
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| Do not touch these “hot” parts with your bare |
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| the rays of the arc when welding or observing | |||||||
| skin or wet clothing. Wear dry, |
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| open arc welding. Headshield and filter lens | |||||||
| gloves to insulate hands. |
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| should conform to ANSI Z87. I standards. | |||||||
3.b. Insulate yourself from work and ground using dry insulation. |
| 4.b. Use suitable clothing made from durable | |||||||||||||
| Make certain the insulation is large enough to cover your full |
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| material to protect your skin and that of your helpers from | |||||||||
| area of physical contact with work and ground. |
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| the arc rays. |
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| In addition to the normal safety precautions, if welding |
| 4.c. Protect other nearby personnel with suitable, | ||||||||||||
| must be performed under electrically hazardous |
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| screening and/or warn them not to watch the arc nor expose | |||||||||
| conditions (in damp locations or while wearing wet |
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| themselves to the arc rays or to hot spatter or metal. |
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| clothing; on metal structures such as floors, gratings or |
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| scaffolds; when in cramped positions such as sitting, |
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| FUMES AND GASES |
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| kneeling or lying, if there is a high risk of unavoidable or |
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| accidental contact with the workpiece or ground) use |
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| can be dangerous. |
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| the following equipment: |
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| • Semiautomatic DC Constant Voltage (Wire) Welder. |
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| 5.a. Welding | may | produce fumes | and | gases | |||
| • DC Manual (Stick) Welder. |
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| hazardous to health. Avoid breathing these | ||||||
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| • AC Welder with Reduced Voltage Control. |
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| fumes and gases.When welding, keep | ||||||
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| your head out of the fume. Use enough | ||||||
3.c. In semiautomatic or automatic wire welding, the electrode, |
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| ventilation and/or exhaust at the arc to keep | |||||||
| electrode reel, welding head, nozzle or semiautomatic |
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| fumes and gases away from the breathing zone. When | |||||||||
| welding gun are also electrically “hot”. |
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| welding with electrodes which require special | |||||||||
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| ventilation such as stainless or hard facing (see | |||||||||
3.d. Always be sure the work cable makes a good electrical |
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| instructions on container or MSDS) or on lead or | ||||||||||
| connection with the metal being welded. The connection |
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| cadmium plated steel and other metals or coatings | |||||||||
| should be as close as possible to the area being welded. |
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| which produce highly toxic fumes, keep exposure as | |||||||||
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| low as possible and below Threshold Limit Values (TLV) | |||||||||
3.e. Ground the work or metal to be welded to a good electrical |
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| using local exhaust or mechanical ventilation. In | ||||||||||
| (earth) ground. |
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| confined spaces or in some circumstances, outdoors, a | |||||||||
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| respirator may be required. Additional precautions are | |||||||||
3.f. | Maintain the electrode holder, work clamp, welding cable and |
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| also | required | when | welding | on | galvanized | steel. | |||
| welding machine in good, safe operating condition. Replace |
| 5. b. The operation of welding fume control equipment is affected | ||||||||||||
| damaged insulation. |
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| by various factors including proper use and positioning of the | ||||||||||
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3.g. Never dip the electrode in water for cooling. |
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| equipment, maintenance of the equipment and the specific | ||||||||||
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| welding | procedure | and |
| application | involved. | ||||||
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3.h. Never simultaneously touch electrically “hot” parts of |
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| Worker exposure level should be checked upon installation | ||||||||||
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| and periodically thereafter to be certain it is within applicable | |||||||||||
| electrode holders connected to two welders because voltage |
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| OSHA PEL and ACGIH TLV limits. |
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| between the two can be the total of the open circuit voltage |
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| of both welders. |
| 5.c. Do not weld in locations near chlorinated hydrocarbon vapors | ||||||||||||
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3.i. When working above floor level, use a safety belt to protect |
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| coming | from degreasing, cleaning | or | spraying | operations. | ||||||
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| The heat and rays of the arc can react with solvent vapors to | |||||||||||
| yourself from a fall should you get a shock. |
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| form phosgene, a highly toxic gas, and other irritating prod- | ||||||||||
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3.j. | Also see Items 6.c. and 8. |
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| ucts. |
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| 5.d. Shielding gases used for arc welding can displace air and | ||||||||||||
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| cause injury or death. Always use enough ventilation, | |||||||||
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| especially in confined areas, to insure breathing air is safe. | |||||||||
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| 5.e. Read and understand the manufacturer’s instructions for this | ||||||||||||
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| equipment and the consumables to be used, including the | |||||||||
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| material safety data sheet (MSDS) and follow your | |||||||||
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| employer’s safety practices. MSDS forms are available from | |||||||||
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| your | welding | distributor or | from | the manufacturer. | |||||
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| 5.f. Also see item 1.b. |
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Aug ‘06
