Tweco K4000 - Manual (Page 11)

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2.04 Personal Protective Equipment and Clothing
WARNING
NOISE CAN DAMAGE HEARING
Noise from the air carbon-arc process can damage your hearing. Operators and sur-
rounding personnel must wear adequate protective hearing devices to ensure personal
protection against noise when noise levels exceed OSHA standards.
Duration Per Day (hours) Sound Level (dBA*) Slow Response
8 90
6 92
4 95
3 97
2 100
1-1/2 102
1 105
1/4 or less 115
* dBA = decibels
WARNING
ARC RAYS, HOT SLAG, AND SPARKS CAN INJURE EYES AND BURN SKIN
The gouging/cutting process produces extreme localized heat and strong ultraviolet
rays. Never attempt to gouge/cut without a welding helmet with the proper lens that
complies with federal guidelines.
A number 12 to 14 shade filter lens provides the best protection against arc radiation.
When in a confined area, prevent the reflected arc rays from entering around the hel-
met. Make sure others are protected from arc rays and sparks. Use approved shielding
curtains and appropriate goggles to provide protection to others in the surrounding
area and operators of nearby equipment.