Lincoln Electric Pro-MIG 140 Manual Del Operador página 3

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WELDING SPARKS can
cause fire or explosion.
4.a. Remove fire hazards from the
welding area. If this is not possi-
ble, cover them to prevent the
welding sparks from starting a fire.
Remember that welding sparks
and hot materials from welding
can easily go through small cracks
and openings to adjacent areas.
Avoid welding near hydraulic lines.
Have a fire extinguisher readily
available.
4.b. Where compressed gases are to be used at the
job site, special precautions should be used to
prevent hazardous situations. Refer to "Safety in
Welding and Cutting" (ANSI Standard Z49.1)
and the operating information for the equipment
being used.
4.c. When not welding, make certain no part of the
electrode circuit is touching the work or ground.
Accidental contact can cause overheating and
create a fire hazard.
4.d. Do not heat, cut or weld tanks, drums or con-
tainers until the proper steps have been taken to
insure that such procedures will not cause flam-
mable or toxic vapors from substances inside.
They can cause an explosion even though they
have been "cleaned". For information, purchase
"Recommended Safe Practices for the
Preparation for Welding and Cutting of
Containers and Piping That Have Held
Hazardous Substances", AWS F4.1 from the
American Welding Society (see address above).
4.e.Vent hollow castings or containers before heat-
ing, cutting or welding. They may explode.
4.f.Sparks and spatter are thrown from the welding
arc. Wear oil free protective garments such as
leather gloves, heavy shirt, cuffless trousers, high
shoes and a cap over your hair. Wear ear plugs
when welding out of position or in confined
places. Always wear safety glasses with side
shields when in a welding area.
4.g.Connect the work cable to the work as close to
the welding area as practical. Work cables con-
nected to the building framework or other loca-
tions away from the welding area increase the
possibility of the welding current passing through
lifting chains, crane cables or other alternate cir-
cuits. This can create fire hazards or overheat
lifting chains or cables until they fail.
SAFETY
ELECTRIC SHOCK can kill.
5.a.The electrode and work (or ground)
5.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.
5.c. In semiautomatic or automatic wire welding, the
electrode, electrode reel, welding head, nozzle or
semiautomatic welding gun are also electrically
"hot".
5.d. Always be sure the work cable makes a good elec-
trical connection with the metal being welded. The
connection should be as close as possible to the
area being welded.
5.e. Ground the work or metal to be welded to a good
electrical (earth) ground.
5.f. Maintain the electrode holder, work clamp, welding
cable and welding machine in good, safe operating
condition. Replace damaged insulation.
5.g. Never dip the electrode in water for cooling.
5.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.
5.i. When working above floor level, use a safety belt
to protect yourself from a fall should you get a
shock.
5.j. Also see Items 4.c. and 1.
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.
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MAR95