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