English 2 English
COOL ARC
®
47
ELECTRIC SHOCK
CAN KILL.
3.a. The electrode and work (or ground) circuits are
electrically “hot” when the welder is on. Do not touch
these “hot” parts with your bare skin or wet clothing.
Wear dry, hole-free gloves to insulate hands.
3.b. Insulate yourself from work and ground using dry
insulation. Make certain the insulation is large
enough to cover your full area of physical contact
with work and ground.
In addition to the normal safety precautions, if
welding must be performed under electrically
hazardous conditions (in damp locations or
while wearing wet clothing; on metal structures
such as floors, gratings or scaffolds; when in
cramped positions such as sitting, kneeling or
lying, if there is a high risk of unavoidable or
accidental contact with the workpiece or ground)
use the following equipment:
•Semiautomatic DC Constant Voltage (Wire)
Welder.
•DC Manual (Stick) Welder.
•AC Welder with Reduced Voltage Control.
3.c. In semiautomatic or automatic wire welding, the
electrode, electrode reel, welding head, nozzle or
semiautomatic welding gun are also electrically
"hot".
3.d. Always be sure the work cable makes a good
electrical connection with the metal being welded.
The connection should be as close as possible to the
area being welded.
3.e. Ground the work or metal to be welded to a good
electrical (earth) ground.
3.f. Maintain the electrode holder, work clamp, welding
cable and welding machine in good, safe operating
condition. Replace damaged insulation.
3.g. Never dip the electrode in water for cooling.
3.h. Never simultaneously touch electrically “hot” parts of
electrode holders connected to two welders because
voltage between the two can be the total of the open
circuit voltage of both welders.
3.i. When working above floor level, use a safety belt to
protect yourself from a fall should you get a shock.
3.j. Also see It ems 6.c. and 8.
ARC RAYS CAN BURN.
4.a. Use a shield with the proper filter and cover plates
to protect your eyes from sparks and the rays of
the arc when welding or observing open arc welding.
Headshield and filter lens should conform to
ANSI Z87. I standards.
4.b. Use suitable clothing made from durable flame-
resistant material to protect your skin and that of
your helpers from the arc rays.
4.c. Protect other nearby personnel with suitable, non-
flammable screening and/or warn them not to watch
the arc nor expose themselves to the arc rays or to
hot spatter or metal.
FUMES AND GASES
CAN BE DANGEROUS.
5.a. Welding may produce fumes and gases hazardous
to health. Avoid breathing these fumes and gases.
When welding, keep your head out of the fume. Use
enough ventilation and/or exhaust at the arc to keep
fumes and gases away from the breathing zone.
When welding with electrodes which require
special ventilation such as stainless or hard
facing (see instructions on container or MSDS)
or on lead or cadmium plated steel and other
metals or coatings which produce highly toxic
fumes, keep exposure as low as possible and
within applicable OSHA PEL and ACGIH TLV
limits using local exhaust or mechanical
ventilation. in confined spaces or in some
circumstances, outdoors, a respirator may be
required. additional precautions are also
required when welding on galvanized steel.
5.b. The operation of welding fume control equipment is
affected by various factors including proper use and
positioning of the equipment, maintenance of the
equipment and the specific welding procedure and
application involved. Worker exposure level should
be checked upon installation and periodically
thereafter to be certain it is within applicable OSHA
PEL and ACGIH TLV limits.
5.c. Do not weld in locations near chlorinated
hydrocarbon vapors coming from degreasing,
cleaning or spraying operations. The heat and rays
of the arc can react with solvent vapors to form
phosgene, a highly toxic gas, and other irritating
products.
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.
