
GENERAL INFORMATION 2
FIRE AND EXPLOSION
Fire and explosion can be caused by hot slag, sparks, or
the plasma arc.
•Be sure there is no combustible or flammable mate-
rial in the workplace. Any material that cannot be
removed must be protected.
•Ventilate all flammable or explosive vapors from
the workplace.
•Donot cutor weldon containersthat may haveheld
combustibles.
•Provideafire watch whenworking inan area where
fire hazards may exist.
•Hydrogen gas may be formed and trapped under
aluminum workpieces when they are cut under-
water or while using a water table. DO NOT cut
aluminum alloys underwater or on a water table
unless the hydrogen gas can be eliminated or dis-
sipated. Trapped hydrogen gas that is ignited will
cause an explosion.
NOISE
Noisecan causepermanent hearingloss. Plasmaarcpro-
cesses can cause noise levels to exceed safe limits. You
must protect your ears from loud noise to prevent per-
manent loss of hearing.
•To protect your hearing from loud noise, wear pro-
tective ear plugs and/or ear muffs. Protect others
in the workplace.
•Noise levels should be measured to be sure the deci-
bels (sound) do not exceed safe levels.
•For information on how to test for noise, see item 1
in Subsection 1.03, Publications, in this manual.
PLASMAARC RAYS
PlasmaArcRays caninjure your eyesand burn yourskin.
The plasma arc process produces very bright ultra violet
and infra red light. These arc rays will damage your
eyesand burnyour skinifyou are notproperlyprotected.
•To protect your eyes, always wear a welding hel-
metor shield. Alsoalways wear safetyglasses with
side shields, goggles or other protective eye wear.
•Wear welding gloves and suitable clothing to pro-
tect your skin from the arc rays and sparks.
•Keep helmet and safety glasses in good condition.
Replace lenses when cracked, chipped or dirty.
•Protect others in the work area from the arc rays.
Use protective booths, screens or shields.
•Use the shade of lens as recommended in Subsec-
tion 1.03, item 4.
1.03 Publications
Refer to the following standards or their latest revisions
for more information:
1. OSHA, SAFETY AND HEALTH STANDARDS,
29CFR 1910, obtainable from the Superintendent of
Documents, U.S. Government Printing Office, Wash-
ington, D.C. 20402
2. ANSI Standard Z49.1, SAFETY IN WELDING AND
CUTTING, obtainable from the American Welding
Society, 550 N.W. LeJeune Rd, Miami, FL 33126
3. NIOSH, SAFETY AND HEALTH IN ARC WELD-
INGAND GAS WELDINGAND CUTTING, obtain-
able from the Superintendent of Documents, U.S.
GovernmentPrinting Office,Washington, D.C. 20402
4. ANSI Standard Z87.1, SAFE PRACTICES FOR OC-
CUPATION AND EDUCATIONAL EYEAND FACE
PROTECTION, obtainable from American National
Standards Institute, 1430 Broadway, New York, NY
10018
5. ANSI Standard Z41.1, STANDARD FOR MEN’S
SAFETY-TOE FOOTWEAR, obtainable from the
American National Standards Institute, 1430 Broad-
way, New York, NY 10018
6. ANSI Standard Z49.2, FIRE PREVENTION IN THE
USE OF CUTTING AND WELDING PROCESSES,
obtainable fromAmerican National Standards Insti-
tute, 1430 Broadway, New York, NY 10018
7. AWS Standard A6.0, WELDING AND CUTTING
CONTAINERS WHICH HAVE HELD COMBUS-
TIBLES, obtainable fromAmerican Welding Society,
550 N.W. LeJeune Rd, Miami, FL 33126
8. NFPA Standard 51, OXYGEN-FUEL GAS SYSTEMS
FOR WELDING, CUTTING AND ALLIED PRO-
CESSES, obtainable from the National Fire Protec-
tion Association, Batterymarch Park, Quincy, MA
02269
9. NFPA Standard 70, NATIONAL ELECTRICAL
CODE, obtainable from the National Fire Protection
Association, Batterymarch Park, Quincy, MA 02269
10. NFPA Standard 51B, CUTTING AND WELDING
PROCESSES, obtainable from the National Fire Pro-
tectionAssociation, Batterymarch Park, Quincy, MA
02269
11. CGA Pamphlet P-1, SAFE HANDLING OF COM-
PRESSED GASES IN CYLINDERS, obtainable from
the Compressed Gas Association, 1235 Jefferson
Davis Highway, Suite 501, Arlington, VA22202