Lincoln Electric 405M, 355M service manual For Electrically

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iii

WELDING SPARKS can SAFETY

CYLINDER may explode iii

cause fire or explosion.

if damaged.

6.a. Remove fire hazards from the welding area.

7.a. Use only

compressed

gas

cylinders

If this is not possible, cover them to prevent

containing the correct shielding gas for the

the welding

sparks from

starting a

fire.

process

used

and

properly

operating

Remember

that

welding

sparks and

hot

regulators

designed

for

the

gas and

materials from welding can easily go through small cracks

pressure used. All hoses, fittings, etc. should be suitable for

and openings to

adjacent

areas. Avoid welding near

the application and maintained in good condition.

hydraulic

lines. Have a fire

extinguisher readily available.

6.b. Where compressed gases are to be used at the job site,

7.b. Always

keep cylinders

in

an

upright position

securely

chained to an undercarriage or fixed support.

special precautions should be used to prevent hazardous

situations. Refer to “Safety in Welding and Cutting” (ANSI

7.c. Cylinders should be located:

Standard

Z49.1)

and the

operating

information for

the

• Away from areas where they may be struck or subjected to

equipment being used.

physical damage.

6.c. When not welding, make certain no part of the electrode

• A safe distance from arc welding or cutting operations and

circuit is touching the work or ground. Accidental contact can

any other source of heat, sparks, or flame.

cause overheating and create a fire hazard.

6.d. Do not heat, cut or weld tanks, drums or containers until the

7.d. Never allow the electrode, electrode holder or any other

electrically “hot” parts to touch a cylinder.

proper steps have been taken to insure that such procedures

will not cause flammable or toxic vapors from substances

7.e. Keep your head and face away from the cylinder valve outlet

inside. They can cause an explosion even though they have

when opening the cylinder valve.

been “cleaned”. For information, purchase “Recommended

Safe Practices for the Preparation for Welding and Cutting of

7.f. Valve protection caps should always be in place and hand

Containers and

Piping

That

Have

Held

Hazardous

tight except when the cylinder is in use or connected for

Substances”, AWS F4.1 from the American Welding Society

use.

(see address above).

6.e. Vent hollow castings or containers before heating, cutting or

7.g. Read and follow the instructions on compressed gas

cylinders, associated equipment, and CGA publication P-l,

welding. They may explode.

“Precautions for Safe Handling of Compressed Gases in

6.f. Sparks and spatter are thrown from the welding arc. Wear oil

Cylinders,” available from the Compressed Gas Association

1235 Jefferson Davis Highway, Arlington, VA 22202.

welding area.

FOR ELECTRICALLY

free protective garments such as leather gloves, heavy shirt,

cuffless trousers, high shoes and a cap over your hair. Wear

powered equipment.

ear plugs when welding out of position or in confined places.

Always wear safety glasses with side shields when in a

6.g. Connect the work cable to the work as close to the welding

8.a. Turn off input power using the disconnect

area as

practical. Work cables

connected to

the building

switch at the fuse box before working on

framework or other locations away from the welding area

the equipment.

increase the possibility of the welding current passing

through lifting chains, crane cables or other alternate circuits.

8.b. Install equipment in accordance with the U.S. National

This can

create fire hazards or

overheat

lifting chains or

Electrical Code, all local codes and the manufacturer’s

cables until they fail.

recommendations.

6.h. Also see item 1.c.

8.c. Ground the equipment in accordance with the U.S. National

Electrical Code and the manufacturer’s recommendations.

Mar ‘95