Lincoln LN-7 - Manual (Page 3)

d. Do not heat, cut or weld tanks, drums or containers
until the proper steps have been taken to insure that
such procedures will not cause flammable or toxic
vapors from substances inside. They can cause an
explosion even though they have been “cleaned.”
For information purchase “Recommended Safe Prac­
tices for the Preparation for Welding and Cutting
of Containers and Piping That Have Held Hazardous
Substances.”, AWS F4.1-80 from the American
Welding Society (see address below).
e. Vent hollow castings or containers before heating,
cutting or welding. They may explode.
f. Also see items 6c and 9c.
6. For Welding in General.
a. Droplets of molten slag and metal are thrown or
fall from the welding arc. Protect yourself with 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 when in a welding area. Use glasses with
side shields when near slag chipping operations.
b. Keep all equipment safety guards, covers and de­
vices in position and in good repair. Keep hands,
hair, clothing and tools away from V-belts, gears,
fans and all other moving parts when starting,
operating or repairing equipment.
c. Be sure the work cable is connected to the work
as close to the welding area as practical. Work cables
connected to the building framework or other loca­
tions some distance from the welding area increase
the possibility of the welding current passing through
lifting chains, crane cables or other alternate circuits.
This can create fire hazards or overheat lifting chains
or cables until they fail.
7. For Gas-Shielded Arc Welding.
a. Use only compressed gas cylinders containing the
correct shielding gas for the process used and prop­
erly operating regulators designed for the gas and
pressure used. All hoses, fittings, etc. should be suit­
able for the application and maintained in good con­
dition.
b. Always keeps cylinders in an upright position sec­
urely chained to an undercarriage or fixed support.
c. Cylinders should be located:
• Away from areas where they may be struck or
subjected to physical damage.
•
A safe distance from arc welding or cutting oper­
ations and any other source of heat, sparks, or flame.
d. Never allow the electrode, electrode holder, or any
other electrically “hot” parts to touch a cylinder.
e. Keep your head and face away from the cylinder
valve outlet when opening the cylinder valve.
f. Valve protection caps should always be in place and
handtight except when the cylinder is in use or con­
nected for use.
g. Read and follow the instructions on compressed gas
cylinders, associated equipment, and CGA publica­
tion P-1 “Precautions for Safe Handling of Compres­
sed Gases in Cylinders” available from the Compres­
sed Gas Association, 1235 Jefferson Davis High­
way, Arlington, VA 22202.
8. For Electrically Powered Equipment.
a. Turn off input power using the disconnect switch
at the fuse box before working on the equipment.
b. Make the electrical installation in accordance with
the National Electrical Code, all local codes and the
manufacturer’s recommendations.
c. Properly ground the equipment in accordance with
the National Electrical Code and the manufacturer’s
recommendations.
9. For Engine Powered Equipment.
a. Turn the engine off before troubleshooting and
maintenance work unless the maintenance work re­
quires it to be running.
b. Operate the internal combustion engines in open,
well-ventilated areas or vent the engine exhaust
fumes outdoors.
c. Do not add the fuel near an open flame, welding
arc or when the engine is running. Stop the engine
and, if possible, allow it to cool when refueling to
prevent spilled fuel from vaporizing on contact with
hot engine parts and igniting. Do not spill fuel when
filling tank. If fuel is spilled, wipe it up and do
not start engine until fumes have been eliminated.
d. In some cases it may be necessary to remove safety
guards to perform required maintenance. Remove
guards only when necessary and replace them when
the maintenance requiring their removal is complete.
Always use the greatest care when working near
moving parts.
e. Do not put your hands near the engine fan. Do not
attempt to override the governor or idler by pushing
on |he throttle control rods while the engine is run­
ning.
f. To prevent accidentally starting gasoline engines
while turning the engine or welding generator during
maintenance work, disconnect the spark plug wires,
distributor cap or magneto wire as appropriate.
g. To avoid scalding, do not remove the radiator pres­
sure cap when the engine is hot.
For more detailed information it is strongly recommended
that you purchase a copy of “Safety in Welding & Cutting
— ANSI Standard Z49.1” from the American Welding So­
ciety, P.O. Box 351040 Miami, Rorida 33135.
December 1985