Return to Master TOC
Return to Master TOC
Return to Master TOC
Return to Master TOC
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 | ||||||||||||||
| 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. | |||||||||||||||
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 | |||||||||||||
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| fumes | and | gases | away from | the breathing | zone. When | |||||||||||
electrode | reel, | welding head, nozzle | or | semiautomatic |
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| welding | with | electrodes | which | require | special | |||||||||||
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 | |||||||||||
connection | with | the | metal | being | welded. The connection |
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| which produce highly toxic fumes, keep exposure as | ||||||||||||||||
should be as close as possible to the area being welded. |
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| low as possible and within applicable OSHA PEL and | ||||||||||||||||
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3.e. Ground the work or metal to be welded to a good electrical |
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| ACGIH TLV limits using local exhaust or mechanical ven- | |||||||||||||||
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| tilation. In confined spaces or in some circumstances, | ||||||||||||||||
(earth) ground. |
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| outdoors, a respirator may be required. Additional pre- | ||||||||||
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3.f. Maintain the electrode holder, work clamp, welding cable and |
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| cautions are also required when welding on galvanized | |||||||||||||||
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| steel. |
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welding machine in good, safe operating condition. Replace |
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damaged insulation. |
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| 5. b. The operation of welding fume control equipment is affected | |||||||||||||
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3.g. Never dip the electrode in water for cooling. |
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| by various factors including proper use and positioning of the | ||||||||||||||
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| equipment, maintenance of the equipment and the specific | |||||||||||||||
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3.h. Never simultaneously touch electrically | “hot” parts of |
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| welding procedure and application involved. Worker expo- | ||||||||||||||
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| sure level should be checked upon installation and periodi- | ||||||||||||||||
electrode holders connected to two welders because voltage |
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| cally thereafter to be certain it is within applicable OSHA PEL | ||||||||||||||||
between the two can be the total of the open circuit voltage |
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| and ACGIH TLV limits. |
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of both welders. |
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3.i. When working above floor level, use a safety belt to protect |
| 5.c. Do not weld in locations near chlorinated hydrocarbon vapors | ||||||||||||||||||
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| coming from degreasing, cleaning or spraying operations. | ||||||||||||||||
yourself from a fall should you get a shock. |
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| The heat and rays of the arc can react with solvent vapors to | |||||||||||||||
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3.j. Also see Items 6.c. and 8. |
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| form phosgene, a highly toxic gas, and other irritating prod- | |||||||||||
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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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