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ii |
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| 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 | |||||||||||||||||||||||
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| 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 | ||||||||||||||||||||||
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| skin or wet clothing. Wear dry, |
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| open arc welding. Headshield and filter lens | ||||||||||||||||||||||
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| 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 | |||||||||||||||||||||||||||||||
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| 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 | |||||||||||||||||||||||||||
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| 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, | |||||||||||||||||||||||||||||
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| must | be | performed | under | electrically | hazardous |
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| screening and/or warn them not to watch the arc nor expose | ||||||||||||||||||||||
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| themselves to the arc rays or to hot spatter or metal. |
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| conditions (in damp locations or while wearing wet |
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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 | |||||||||||||||||||||
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| • 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 | ||||||||||||||||||||||||
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3.c. In semiautomatic or automatic wire welding, the electrode, |
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| ventilation and/or exhaust at the arc to keep | ||||||||||||||||||||||||||
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| fumes | and gases | away | from | the breathing | zone. When | |||||||||||||||||||||||||
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| electrode | reel, | welding | head, nozzle | or | semiautomatic |
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| welding | with |
| electrodes | which | require | special | ||||||||||||||||||||||
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| welding gun are also electrically “hot”. |
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| ventilation such as stainless or hard facing (see | |||||||||||||||||||||||||
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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 | ||||||||||||||||
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| cadmium | plated | steel | and | other metals | or | coatings | ||||||||||||||||||||||||
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| connection | with | the | metal | being | welded. The | connection |
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| which produce highly toxic fumes, keep exposure as | ||||||||||||||||||||||||||||
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| should be as close as possible to the area being welded. |
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| low as possible and below Threshold Limit Values (TLV) | ||||||||||||||||||||||||||||
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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 | |||||||||||||||||||||||||
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| confined spaces or in some circumstances, outdoors, a | ||||||||||||||||||||||||||||||
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| (earth) ground. |
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| respirator may be required. Additional precautions are | |||||||||||||||||||
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3.f. Maintain the electrode holder, work clamp, welding cable and |
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| also | required | when | welding |
| on | galvanized | steel. | ||||||||||||||||||||||
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| welding machine in good, safe operating condition. Replace |
| 5.b. Do not weld in locations near chlorinated hydrocarbon vapors | |||||||||||||||||||||||||||||
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| damaged insulation. |
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| coming from degreasing, cleaning or spraying operations. | |||||||||||||||||||||
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3.g. Never dip the electrode in water for cooling. |
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| The heat and rays of the arc can react with solvent vapors to | |||||||||||||||||||||||||||
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| form phosgene, a highly toxic gas, and other irritating | ||||||||||||||||||||||||||||
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3.h. Never simultaneously touch electrically “hot” parts of |
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| electrode holders connected to two welders because voltage |
| 5.c. Shielding gases used for arc welding can displace air and | |||||||||||||||||||||||||||||
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| between the two can be the total of the open circuit voltage |
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| cause | injury or | death. Always | use enough ventilation, | |||||||||||||||||||||||||
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| of both welders. |
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| especially in confined areas, to insure breathing air is safe. | |||||||||||||||||||
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3.i. When working above floor level, use a safety belt to protect |
| 5.d. Read and understand the manufacturer’s instructions for this | |||||||||||||||||||||||||||||||
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| yourself from a fall should you get a shock. |
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| equipment and the consumables to be used, including the | ||||||||||||||||||||||||||
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3.j. Also see Items 6.c. and 8. |
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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.e. Also see item 1.b. |
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| Mar ‘95 |
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