Miller GA-17C - Section 4 - Sequence of Operation; Gas Metal Arc Welding (GMAW)

2.
Insert
gun
into
wire
drive
assembly
until
gun/feeder
connector
stops
against
wire
drive
assembly.
3.
Tighten gun/feeder
connector
securing
knob.
3-2.
GUN
SWITCH CONNECTION
(FIgure 3-1)
Connect
gun
trigger
switch into
TRIGGER
receptacle
on
wire
feeder
as
follows:
align keyways,
insert
plug,
and
rotate
threaded
collar
fully
clockwise.
SECTION
4-
SEQUENCE
OF
OPERATION
4-1.
GAS
METAL
ARC
WELDING
(GMAW)
4A
WARNING: ELECTRIC
SHOCK
can
kill;
MOVING
PARTS
can
cause
serious
Injury;
IMPROPER AIRFLOW
AND
EXPOSURE
TO
ENVIRONMENT
can
damage
Internal
parts.

Do
not
touch
live
electrical
parts.

Do
not
touch
welding
wire
or
any
metal
part
in
contact
with the
wire
while
welding.
The
welding
wire and all metal
parts
in
contact
with
it
carry
wed
output
when
the
gun
switch is
depressed.

Keep
all
covers
and
panels
in
place
while
op
erating.
Warranty
is
void
if
the
welding
power
source
is
operated
with
any
portion
of
the
outer
enclosure
removed.
ARC
RAYS, SPARKS,
AND
HOT SURFACES
can
burn
eyes
and
skin;
NOISE
can
damage
hearing.

Wear
correct
eye,
ear,
and
body protection.
FUMES
AND
GASES
can
seriously
harm
your
health.

Keep
your
head Out
of
the
fumes.

Ventilate
to
keep
from
breathing
fumes
and
gases.

If
ventilation is
inadequate,
use
approved
breathing
device.
WELDING
WIRE
can cause
puncture
wounds.

Do
not
point
gun
toward
any
part
of the
body,
any
conductive
surface,
or
other
personnel.
HOT
METAL,
SPATTER,
AND
SLAG
can
cause
fire
and
burns.

Watch
forfire.

Keep
a
fire
extinguisher
nearby,
and know
how
to
use
it.

Do
not
use near
flammable
material.

Allow
work
and
equipment
to
coo/before
han
dling.
MAGNETIC
FIELDS
FROM HIGH
CURRENTS
can
affect
pacemaker
operation.

Wearers
should
consult their
doctor
before
going
near
arc
welding,
gouging,
orspot
welding
~operations.
See
Section 1
-
Safety
Rules For
Operation
Of
Arc
Welding
Power
Source
in
welding
power
source
Owners
Manual
for basic
welding
safety
information.
1.
Be
sure
that
proper
electrical
connections
have
been made
to
the
welding
power
source,
and the
wire
feeder.
2.
Be
sure
that
the
welding
wire
has
been
properly
threaded
and that
correct
initial
tensions have
been
set
on
the
drive rolls
(refer
to
the
appropriate
Own
ers
Manual).
3.
Be
sure
that the
proper
shielding
gas
is connected
to
the
shielding
gas
valve.
4.
Place
the
wire
feed
control(s)
in
the
required
posi
tion
for the
welding
setup.
5. Place
the controls
on
the
welding
power
source
in
the
required
position
for the
welding
setup
(refer
to
welding
power
source
Owners
Manual).
6.
Wear
dry
insulating
gloves
and
clothing,
and
wear
welding
helmet with
proper
filter
lens
according
to
ANSI
Z49.1.
7.
Prepare
for
welding
as
follows,
connect
work
clamp
to
clean,
bare
metal
at
workpiece.
8.
Turn
on
the
shielding
gas
supply.
9.
Energize
the
welding
power
source
and
the
wire
feeder
(refer
to
the
respective
Owners
Manual).
IMPORTANT:
When
installing
new
equipment,,
orafter
prolongedshutdown,
allowshielding
gas
to
flowcontinu
ously
forat
least
one
minute
before
welding
to
purge
the
shielding
gas
line. To
avoid
wasting
wire while
purging,
open
the drive roll
housing.
10.
Press
Purge
button
on
the
wire
feeder
(if
applicable)
or
the
gun
switch
to
purge
the
gas
line.
11.
Close
drive
roll
housing,
and
adjust
tension
(see
ap
propriate
Owners
Manual).
12.
Press
the
gun
trigger,
and
run
the
welding
wire
out
beyond
the
end
of
the
gas
nozzle.
Cut
the
wire off
so
it
extends
out 1/4
to
3/8 in.
(6.4
mm
to
9.5
mm)
from
end
of nozzle.
13.
Set
the Wire
Speed
control
slightly
higher
than
an
ticipated
wire
speed.
14.
Hold
the
end
of
the
gas
nozzle
approximately
1/2 in.
(12.7
mm)
from
the
workpiece.
15.
Press
the
gun trigger.
Gas
starts
to
flow,
wire
starts
to
feed,
and
the
arc
will
be
established.
If
the
welding
wire
appears
to
slip, adjust
drive
roll tension
accord
ing
to
wire
feeder
Owners
Manual.
OM-1028
Page
3