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1-3.
ARC WELDING
Comply
with
precautions
in
1-1, 1-2,
and this section.
Arc
Welding, properly
done,
is
a
safe
process,
but
a
careless
operator
invites trouble. The
equipment
carries
high
currents at
significant voltages.
The
arc
is
very
bright
and hot.
Sparks fly,
fumes
rise,
ultraviolet
and in
frared energy
radiates,
weldments
are
hot,
and
com
pressed
gases may be used. The wise
operator
avoids
unnecessary risks and
protects
himself and others from
accidents. Precautions
are
described
here and in
stan
dards referenced in index.
H.
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
fight-colored
surfaces,
and 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
nec
essary,
use
additional
protective clothing
such
as
leather
jacket
or
sleeves, flame-proof
apron, and
f ire-re
sistant
leggings.
Avoid outer
garments
of untreated
cot-
Bare skin
protection.
Wear
dark,
substantial
clothing.
Button collar
to
protect
chest and neck and button
pock
ets to
prevent entry
of
sparks.
2.
Eye
and Head Protection
Protect eyes from exposure
to
arc.
NEVER look
at
an
electric
arc
without
protection.
Welding
helmet
or
shield
containing
a
filter
plate
shade
no.
12
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
IMMEDIATELY.
Replace
clear
cover
plate
when
bro
ken,
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
sepa
rate
room or
enclosed
bay
is best.
In
open
areas,
sur
round the
operation
with
low-reflective,
non-combusti
ble
screens
or
panels.
Allow for free air
circulation,
par
ticularly
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.
I.
Toxic Fume Prevention
Comply
with
precautions
in 1-2B.
Generator
engine
exhaust
must be
vented
to
the outside
air. Carbon monoxide
can
kill.
J.
FIre and
Explosion
Prevention
Comply
with
precautions
in
1-2G.
Equipments
rated
capacity.
Do not
overload
arc
weld
ing 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
ves
sel. It creates
a
brittle
area
that
can cause a
violent nip
ture
or
lead to
such
a
rupture
under
rough
handling.
K.
Compressed
Gas
Equipment
Comply
with
precautions
in 1-2D.
L.
Shock Prevention
Exposed
hot conductors
or
other bar metal in the weld
ing
circuit,
or
in
ungrounded, electrically-HOT equip
ment
can
fatally
shock
a
person
whose
body
becomes
a
conductor. DO NOT
STAND, SIT, LIE,
LEAN
ON,
OR
TOUCH
a
wet
surface when
welding,
without suitable
protection.
To
protect
against
shock:
Keep body
and
clothing dry.
Never work
in
damp
area
without
adequate
insulation
against
electrical shock.
Stay
on a
dry
duckboard,
or
rubber matwhen
dampness
or
sweat
can
not
be avoided.
Sweat,
sea
water,
or
mois
ture between
body
and
an
electrically
HOT
part-or
grounded
metal-reduces
the
body
surface electrical
re
sistance,
enabling dangerous
and
possible
lethal
cur
rents to
flow
through
the
body.
1.
Grounding
the
Equipment
When
arc
welding equipment
is
grounded according
to
the National
Electrical
Code,
and the work is
grounded
according
to
ANSI Z49.1
Safety
In
Welding
And Cut
ting,
a
voltage
may exist betweenthe electrode and any
conducting object. Examples
of
conducting objects
in
clude,
but
are
not
limited
to,
buildings,
electrical
tools,
work
benches,
welding
power
source
cases,
workpieces,
etc.
Never touch the electrode and
any
metal
object
unless the
welding
power
source
Is off.
When
installing,
connect the frames of each
unit
such
as
welding
power
source,
control, worktable,
and
water
cir
culatorto
the
building ground.
Conductors
must
be ade
quate
to
carry
ground
currents
safely. Equipment
made
electrically
HOT
by
stray
current may
shock,
possibly
f
a
tally.
Do NOT
GROUND
to
electrical
conduit,
orto
a
pipe
carrying
ANY
gas orflammable
liquid
such
as
oil orfuel.
121988
Page
4
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