Miller 900019 Installation And Operation Manual - Page 3
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SECTION
1-
SAFETY RULES FOR OPERATION OF ARC WELDING MACHINE
1.1.
GENERAL
DA.
These rules
apply
to
ac
and
dc
welding
generators,
ac
transformer and
ac/dc welding
machines,
and
dc transformer rectifier
welding
machines.
DB.
In
arcwelding
operations,
where
electrically
en
ergized
parts
are
exposed,
observe the
following
safety
rules
to insure maximum
personal safety
and
protect
nearby
persons.
DC.
Failure
to observe these
safety
precautions
may
expose not
only
you, but fellow workers
as
well,
to serious
injuries.
Once these rules
are
learned
and
kept
in
mind, proceed
with maximum
assurance.
WELDING MACHINE
ciA.
Never
use
welding
cables at currents
in
excess
of
their rated
capacity.
It will
cause
overheating
and
rapid
deterioration
of
the
insulation.
It is also
uneconomical.
DONT
use worn or
poorly
connected
cables.
DB.
Inspect
the cables
frequently. Immediately
repair
all breaks in the insulation with rubber and
friction
tapes.
Tighten
all cable connections and
adequately
insulate any
joints
where
a
connector may have
an
exposed
conductive
part.
In addition
to the
potential
hazard
to
life,
a
hazard
occurs
when
exposed
sections
of
cable
come
in contact with
grounded
metallic
objects, causing
an
arc.
Unprotected
eyes
may be
injured
and fire may result
if combustible
materials such
as
oil
or
grease
are
in the
vicinity.
The
efficiency
and
quality
of
welding
will be im
proved by
elimination of these
dangerous grounds,
and
by keeping
connections
tight.
1.3.
ELECTRODE HOLDER
DONT
use
electrode holders with defective
jaws.
ciA.
Keep
the
jaws
of the electrode holder
tight
and the
gripping
surfaces
in
good
condition to
provide
close
contact
with
the
electrodes.
Defective
jaws
will
permit
the
electrode to
wobble,
making
control of
the
welding
operations difficult.
DONT
use
electrode holder
with loose
cablecon
nections.
Keep
the connections of the electrode lead to the
holder
tight
at
all
times.
Use
only fully
insulated electrode holders
(and
with
out
protruding
screwheads.)
Never touch two electrode holders from
two
separate
welding
machines at the
same
time.
1.4.
CODE CONFORMANCE
ciA.
The
machine and its
equipment
must be installed
and
maintained
in
accordance
with
the National
Electrical Code
and
local
requirements.
1.5.
PARALLEL CONNECTIONS
ciA.
See
diagrams
in the
instruction manual
applying
to
the
welding
machine used.
1.6.
POWER DISCONNECT SWITCH
DA.
If
the
welding
machine does not include
a
power
disconnect
switch,
install
one
at
or
near
the
machine.
1.7.
POLARITY
SWITCH
DONT
operate
the
polarity
switch under
load.
ciA.
The
polarity
switch
(when supplied)
is
provided
for
changing
the electrode lead from
positive (reverse
polarity)
to
negative (straight polarity).
Never
move
it while under the load
of
a
welding
current.
Operate
this
switch
only
while
the
machine
is
idling
and the
welding
circuit is open. The
potential
dangers
of
opening
the circuit while
carrying high
current
are:
0(1)
An
arc
will
form between the
contact
surfaces
of the switch and
severely
burn
them.
0(2)
The person
throwing
the switch may receive
a
severe
burn
from
this
arcing.
1.8.
RANGE SWITCH
DONT
operate
the
range
switch
under
load.
ciA.
The range switch
(when
supplied)
is
provided
for
obtaining required
current
settings.
It must
never
be
operated
while the
machine
is under the load of
welding
current.
Operate
the range switch
only
while the machine is
idling
and the
welding
circuit
is open.
Thepotenialdangerofswitchingthe
circuit
while
carrying high
current is the formation of
an
arc
between the contact surface which will
severely
burn
them.
Repeated
occurrences
of this
arcing
will
eventually
prevent operation
of the
contacts.
1.9.
EXHAUST GASES
DONT
use
gas
engine
units
in
confined spaces
without
venting
the exhaust
gases.
ciA.
If
gasoline
or
other fuel driven
welding
machines
are
operated indoors, provide
means
to
pipe
the
exhaust
gases
to
the outside air to
avoid carbon
monoxide
poisoning.
1.2.
WELDING CABLES
DONT
overload cables.
DB.
DC.
DD.
I
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