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possible
leak.
For fuel
gas,
open
to
less than
one
turn
to
permit quick
emergency shutoff.
Use pressure charts
(available
from
your
supplier)
for safe
and
efficient,
recommended pressure
settings
on
regulators.
It
will reduce
backfiring
and chance of flashbacks.
Check
for leaks
on
first
pressurization
and
regularly
there
after. Brush with
soap
solution
(capful
of
Ivory Liquid
or
equivalent
per
gallon
of
water). Bubbles
indicate leak. Clean
off
soapy
water
after
test;
dried
soap
is combustible.
E.
User
Responsibilities
Remove
leaky
or
defective
equipment
from service immed
iately
and
repair
them
only
if recommended in
equipment
instruction manual.
Send
others for
repair
to
manufacturers
designated repair
center
where
special
techniques
and tools
are
used
by
trained
personnel.
Refer
to
User
Responsibilities
statement
in
equipment
manual.
F.
Leaving Equipment
Unattended
Close gas
supply
at
source
and drain gas.
G.
Rope Staging-Support
Rope staging-support
should
not
be used for
welding
or
cut
ting operation;
rope may burn.
1-3.
ARC WELDING
Comply
with
precautions
in 1-2 and this section. Arc Weld
ing, properly
done,
is
a
safe
process, but
a
careless operator
invites trouble. The
equipment
carries
high
currents at
signifi
cant
voltages.
The
arc
is
very
bright
and hot.
Sparks fly.
fumes
rise,
ultraviolet and infrared energy
radiates,
weld
ments
are
hot,
and
compressed
gases may be used. The wise
operator avoids
unnecessary
risks
and protects
himself and
others
from accidents. Precautions
are
described here and in
standards referenced in index.
A.
Burn Protection
Comply
with
precautions
in
1-2.
The
welding
arc
is intense and
visibly
bright.
Its radiation
can
damage
eyes,
penetrate
lightweight clothing,
reflect
from
light-colored
surfaces,
arid
burn the skin and eyes.
Skin burns
resemble
acute
sunburn,
those
from
gas-shielded
arcs
are
more
severe
and
painful.
DONT
GET
BURNED; COMPLY
WITH PRECAUTIONS.
1.
Protective
Clothing
Wear
long-sleeve clothing (particularly
for
gas-shielded
arc)
in
addition
to
gloves, hat,
and shoes
(1-2A).
As
necessary,
use
additional
protective clothing
such
as
leather
jacket
or
sleeves,
flame-proof
apron, and
fire-resistant
leggings.
Avoid
outergarments
of untreated
cotton.
Bare skin
protection.
Wear
dark,
substantial
clothing.
Button
collar
to
protect chest and neck and button
pockets
to
pre
vent
entry of
sparks.
2.
Eye
and Head Protection
Protect
eyes
from exposure
to
arc.
NEVER look
at
an
elec
tric
arc
without
protection.
Welding
helmet
or
shield
containing
a
filter
plate
shade no.9
or
denser
must
be used
when
welding.
Place
over
face before
striking
arc.
Protect filter
plate
with
a
clear
cover
plate.
Cracked
or
broken helmet
or
shield should NOT be
worn;
radiation
can
pass
through
to
cause
burns.
Cracked,
broken,
or
loose filter
plates
must
be
replaced
IM
MEDIATELY.
Replace
clear
cover
plate
when
broken, pitted,
or
spattered.
Flash
goggles
with
side shields MUST be
worn
under the
helmet
to
give
some
protection
to
the eyes should the helmet
not
be
lowered
over
the face before
an
arc
is struck.
Looking
at
an
arc
momentarily
with
unprotected
eyes
(particularly
a
high
intensity
gas-shielded
arc)
can cause
a
retinal burn that
may
leave
a
permanent dark
area
in the
field of vision.
3.
Protection of
Nearby
Personnel
Enclosed
welding
area.
For
production welding,
a
separate
room
or
enclosed
bay
is best.
In
open
areas,
surround
the
operation
with
low-reflective,
non-combustible
screens
or
panels.
Allow
for
free
air
circulation, particularly
at
floor
level.
Viewing
the
weld. Provide face
shields
for
all persons who
will be
looking
directly
at
the weld.
Others
working
in
area.
See that all
persons
are
wearing
flash
goggles.
Before
starting
to
weld,
make
sure
that
screen
flaps
or
bay
doors
are
closed.
B.
Toxic Fume Prevention
Comply
with
precautions
in
1-28.
Generator
engine
exhaust
must
be vented
to
the outside
air.
Carbon monoxide
can
kill.
C.
Fire and
Explosion
Prevention
Comply
with
precautions
in
1-2C.
Equipments
rated
capacity.
Do
not
overload
arc
welding
equipment.
It may overheat cables and
cause
a
fire.
Loose cable connections may overheat
or
flash and
cause
a
fire.
Never strike
an arc on
a
cylinder
or
other pressure vessel. It
creates
a
brittle
area
that
can
cause
a
violent rupture
or
lead
to
Such
a
rupture later under
rough handling.
D.
Compressed
Gas
Equipment
Comply
with
precautions
in
1-2D.
E.
Shock Prevention
Exposed
hot conductors
or
other bare metal in the
welding
circuit,
or
in
ungrounded, electrically-HOT
equipment
can
fatally
shock
a
person whose
body
becomes
a
conductor. DO
NOT
STAND, SIT, LIE,
LEAN
ON,
OR TOUCH
a
wet
sur
face when
welding,
without suitable
protection.
To protect
against
shock:
Keep body
and
clothing
dry.
Never work
in
damp
area
with
out
adequate
insulation
against
electrical shock.
Stay
on
a
dry duckboard,
or
rubber
mat
when
dampness
or sweat
can
not
be avoided.
Sweat,
sea
water,
or
moisture between
body
and
an
electrically
HOT
part
-
or
grounded
metal
.
reduces
the
body
surface electrical
resistance,
enabling dangerous
and
possibly
lethal
currents
to
flow
through
the
body.
1.
Grounding
the
Equipment
When
installing,
connect
the
frames
of
each
unit
such
as
welding
power source,
control,
work
table,
and
water
circula
tor
to
the
building ground.
Conductors
must
be
adequate
to
carry
ground
currents
safely. Equipment
made
electrically
HOT by
stray
current
may
shock, possibly fatally.
Do NOT
GROUND
to
electrical
conduit,
or
to
a
pipe carrying
ANY
gas
or a
flammable
liquid
such
as
oil
or
fuel.
Three-phase
connection.
Check
phase requirement
of
equip
ment
before
installing.
If
only 3-phase
power is
available.
connect
single-phase equipment
to
only
two
wires
of
the
3-phase
line.
Do NOT
connect
the
equipment ground
lead
to
the third
(live)
wire,
or
the
equipment
will become electri.
cally
HOT
-
a
dangerous
condition that
can
shock, possibly
fatally.
Before
welding,
check
ground
~or
continuity.
Be
sure
conduc
tors
are
touching
bare metal of
equipment
frames
at
connec
tions.
If
a
line
cord with
a
ground
lead
is
provided
with the
equip
ment
for connection
to
a
switchbox,
connect
the
ground
lead
to
the
grounded
switchbox. If
a
three-prong plug
is
added for
connection
to
a
grounded mating receptacle,
the
ground
lead
must
be connected
to
the
ground
prong
only.
If the line cord
comes
with
a
three-prong plug,
connect to
a
grounded mating
receptacle.
Never
remove
the
ground
prong from
a
plug,
or
use
a
plug
with
a
broken off
ground
prong.
Trademark
of
Proctor & Gamble.
OM-238
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