Miller 900019 Installatie- en bedieningshandleiding - Pagina 5
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1.15. SOLVENTS
DA.
Do not weld where chlorinated
hydrocarbon
vapors
from
degreasing, cleaning,
or
spraying
may reach
or
he drawn into air
surrounding
the
welding
operation.
The heat of the
arc can
decompose
solvent vapors to
form
phosgene,
a
highly
toxic
gas
and
other
irritating
decomposition products.
OB.
Do not weld where ultraviolet
lightfrom
the electric
arc
can
penetrate
air
containing
even
minute
amounts
of vapors from solvents such
as
trichlo
roethylene
or
perchloroethylene.
Ultraviolet
light
can
decompose
the
vapors
to
form
phosgene,
a
highly
toxic
gas,
and
other
irritating
products.
1.16. FIRE HAZARDS
DONT
weld
near
flammable
or
combustible
materials.
DA.
Fires
can
be caused
by
the arc,
by
contact with
the heated
metal, by
slag,
or
sparks.
Keep
com
bustibles
at least 35
feet from the
arc
or
suitably
protected.
If
welding
must
be done
in
a
particular
area,
move
the combustibles
away.
If
they
cannot
be
moved,
cover
them
completely
with fire resistive
screens.
Cover cracks
or
openings
in floors
or
walls;
sweep
floor free of combustibles and wet
down,
if
wood,
being
sure
welder
wears
insulation
shoe
coverings.
Avoid
welding
on
partition
walls
in contact with
combustibles.
Heated metal
on
the
other side of
partition
wall
being
welded upon
can
ignite
combustibles
in
contact
with the
partition.
Where other than
a
minor fire
might
develop,
have
a
fire watcher stand
by
with suitable fire extin
guishing
equipment
for
at least
one-half
hour
after
the
welding
is
completed.
1.17. ELECTRICAL SHOCK-VOLTAGE
OPEN power circuits
before
checking
machines.
DA.
Before
working
on
the
wiring,
switches, controls,
etc.,
open
the
power
line
disconnect
switch.
In
most
welding
shops
the
power
supply
used
for
arc
welding
machines
is
230
or
460
volts.
Open
circuit
voltages
are
usually
less than 100 volts and
welding
or arc
voltage
drops
are
still
lower.
How
ever, all of these
voltages
are
capable
of
developing
a
harmful
or
fatal current
to the
body.
DONT
touch
electrically
hot
parts.
DB.
Never touch any
exposed
or
non-insulated
part
of
the
cables,
cable
connectors, clamps,
electrode
holders, electrodes~
or
the power
supply equipment
to
prevent
harmful
or
fatal
electric shock
or
burns.
1.18. ELECTR ICAL SHOCK-DAMPNESS
NEVER work in
a
damp
area
without suitable
in
sulation
against
shock.
Keep hands, feet,
and
clothing dry
at all
times.
DA.
To
pievent
harmful
body shocks,
keep hands,
feet
and
clothing
dry.
Never stand
or
lie in
puddles
of
water, damp
ground,
or
against grounded
metal when
welding
without
suitable insulation
against
shock.
Always
find
a
dry
board
or
rubber mat to stand
on
when
water, moisture,
or
perspiration
cannot be
avoided.
Dampness
between the
body
and
an en
ergized
or
grounded
metallic
part
lowers
the
resistance
to the
passage
of current to
the
body
which may
produce
a
harmful
or
fatal shock.
Salt
in
perspiration
or
sea
water
dangerously
1ower~
contact
resistances.
1.19. STARTING UNDER LOAD
DONT
leave
an
uninsulated electrode
holder,
or
a
live
electrode
on
the table
topor
in contact with
a
grounded
metallic
surface.
When
it
is
not
in use,
never
place
an
electrode
holder
in contact with the
table
top
or
other metallic
surface
in
contact
with
welding ground.
Provide
an
insulated hook
or
holder for the electrode
holder.
A
potential
danger
is that
a
holder in contact with
the
ground
circuit
provides
a
dead short circuit
on
the
welding
machine.
If the machine should be
started
up, this short circuit would
cause
an ex
cessive load
on
the machine and may
damage
the
insulation.
1.20. FACE PROTECTION
DONT
use
cracked
or
defective helmets
or
shields.
Keep
the
helmet,
hand
shields,
or
face shield in
good
condition, If cracks
occur
in the fibre
material,
replace
the
shield,
since the
leakage
of
arc
rays
may
cause
serious
burns.
1.21. EYE PROTECTION
NEVER
under
any
circumstances,
look
at
an
electric
arc
without eye
protection.
CAUTION
Make
sure
that flash
goggles
are
used under the
welding
helmet
at
all
times,
particularly
while
gas
shielded-arc
welding.
DA.
In
some
type
of
arc
welding,
such
as
gas
shielded-
arc
welding.ultraviolet
and infrared radiation
from
the
arc
is
particularly
intense and
requires
constant
attention to avoid
arc
flashes
to the
welder
when
striking
an
arc
and
to
avoid exposure to other
welders.
NEVEB
strike
an
arc
without
ascertaining
that
nearby
persons either
have the
necessary
pro
tective
equipment
or
are
looking
in the
opposite
direction.
DB.
For
welding operations
in
open
areas,
provide
portable,
nonreflecting
screens
to
shield persons
nearby
from the rays of the
arc.
Eye
burns
from
the arc,
though
not
generally
permanent injuries,
are
exceedingly painful.
Such
burns
frequently
referred
to
as
flashes,
feel
like hot sand In the
eye.
For eye burns consult your
first
aid station
or
doctor.
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