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SECTION

SAFETY RULES FOR OPERATION OF ARC WELDING POWER SOURCE

1-1.

INTRODUCTION

We learn

by experience.

Learning safety through

per

sonal

experience,

child

touching

hot

stove

harmful, wasteful,

and unwise. Let the

experience

others teach you.

Safe

practices developed

from

experience

in the

use

welding

and

cutting

are

described in this manual. Re

search,

development,

and

field

experience

have

evolved reliable

equipment

and safe

installation,

opera

tion,

and

servicing practices.

Accidents

occur

when

equipment

improperly

used

maintained. The

rea

son

for the safe

practices

may

not

always

given.

Some

are

based

common

sense,

others may

require

technical

volumes

explain.

It is wiser to follow the

rules.

Read and understand these safe

practices

before

tempting

install, operate,

service the

equipment.

Comply

with these

procedures

applicable

the par

ticular

equipment

used and their instruction

manuals,

for

personal

safety

and for the

safety

of others.

Failure

observe these sale

practices

may

cause

seri

ous

injury

death. When

safety

becomes

habit,

the

equipment

can

be used with confidence.

These safe

practices

are

divided into

two

Sections:

1-General

Precautions,

common

arc

welding

and

cut

ting;

and 2-Arc

Welding (and Cutting) (only).

Reference standards: Published Standards

safety

are

also

ava~able

for

additional and

complete

pro

cedures than those

given

this manual.

They

are

listed

in the

Standards

Index in this manual.

ANSI Z49.1 is

the

most

complete.

The National Electrical

Code,

Occupational Safety

and

Health

Administration,

local industrial

codes,

and local

inspection requirements

also

provide

basis for

equip

ment

installation,

use,

and service.

1-2.

GENERAL PRECAUTiONS

Different

arc

welding

processes,

electrode

alloys,

and fluxes

can

produce

different

fumes,

gases,

and

radIation levels. In

addition

to the

informatIon

thIs

manual,

sure

to consult flux and electrode

manufacturers

Material

Safety

Data

Sheets

(MSDSs)

for

specIfic

technical data and

precautIon

ary

measures

concerning

their material.

Burn Prevention

Wear

protective clothing-gauntlet gloves

designed

for

use

welding,

hat,

and

high safety-toe

shoes.

Button

shirt collar and

pocket flaps,

and

wear

cuffless

trousers

avoid

entry

sparks

and

slag.

Wear helmet with

safety goggles

and

glasses

with side

shields

underneath,

appropriate

filter lenses

plates

(protected by

clear

cover

glass).

This is

MUST for

welding

cutting, (and chipping)

protect

the eyes

from radiant

energy

and

flying

metal.

Replace

cover

glass

when

broken,

pitted,

spattered.

See

-3A.2.

Avoid

oily

greasy

clothing.

spark

may

ignite

them.

Hot

metal such

electrode stubs and

workpieces

should

never

be handled without

gloves.

Medical first

aid and eye

treatment. First

aid facilities

and

qualified

first aid

person should

be available for

each shift unless medical facilities

are

for im

mediate

treatment

of flash burns of the eyes and skin

burns.

Ear

plugs

should be

worn

when

working

overhead

confined space. A hard hat should be

worn

when

others work overhead.

Flammable hair

preparations

should

not

be used

per

sons

intending

weld

cut.

Toxic Fume Prevention

Severe

discomfort,

illness

death

can

result from

fumes,

vapors,

heat,

oxygen

enrichment

depletion

that

welding (or cutting)

may

produce.

Prevent

them

with

adequate

ventilation

described

ANSI Stan

dard Z49.1 listed

Standards

Index. NEVER ventilate

with

oxygen.

Lead

-,cadmium-,

zinc

mercury-, and

beryllium-bear

ing

and similar

materials,

when welded

(or cut)

may pro

duce harmful concentrations of toxic fumes.

Adequate

local exhaust ventilation

must

used,

each person

in the

area as

well

the

operator

must

wear an

air-sup

plied respirator.

For

beryllium,

both

must

used.

Metals

coated with

containing

materials that emit

toxic fumes should

not

be heated unless

coating

moved from the work

surface,

the

area

is well ventilated

and,

necessary, while

wearing

air-supplied respira

tor.

Work

confined space

only

while it is

being

ventilated

and,

necessary, while

wearing

air-supplied respira

tor.

Gas leaks

confined space should be avoided.

Leaked gas

large quantities

can

change

oxygen

con

centration

dangerously.

not

bring

gas

cylinders

into

confined space.

Leaving

confined space, shut OFF gas

supply

source

prevent

possible

accumulation of gases

the space

downstream valves have been

accidentally opened

left open. Check

sure

that the

space

is safe before

re-entering

it.

Vapors

from chlorinated solvents

can

decomposed

the heat of the

arc

(or flame)

form

PHOSGENE,

highly

toxic gas, and other

lung

and

eye

irritating prod

ucts.

The ultraviolet

(radiant)

energy of

the

arc can

also

decompose

trichloroethylene

and

perchloroethylene

F2544

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