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C.
Torch Gas Valve
Operation
(If
Applicable)
The gas valve allows gas flow control
at
the torch. A
one-half
turn
counterclockwise
opens
the gas
valve,
and
a
one-half
turn
cJockwise
closes the valve.
The
gas
valve allows control of gas
postf
low
time,
or
~he length
of time gas flows after the
arc
is
extinguish
ed.
Insufficient gas
postflow
results in
an
oxidized
(black)
electrode surface. If
an
oxidized electrode
were
used,
the black surface would contaminate the weld
and
cause
poor
arc
direction.
IMPORTANT
_____________
As
a
general
rule,
allow 10 seconds of
gas
pos(flow
time
per
100
amperes
of
weld.
current
before
closing
valve.
3 -3. POWER CABLE CONNECTION
(Figures
3-1,
3-2.
and
3-3)
ELECTRIC SHOCK
can
kill.
Do
not
touch live electrical
parts.
Shut down
welding
power
source
and disconnect
input
power
employing lockout/tagging
pro
cedures
before
installing
torch.
WARNING:
Lockout/tagging procedures
consist of
padlocking
line
disconnect switch in open
position, removing
fuses
from
fuse
box,
or
shutting
off and
red-tagging
circuit
breaker
or
other
disconnecting
device.
A.
High
Flex Cable
Assembly
The
high
flex cable
assembly
contains the
power
cable
within the gas hose. The
high
flex cable has
a
3/8-24
male
right-hand fitting (Figure
3-1).
To install
high
flex
cable,
connect
high
flex cable
fitting
to
power
cable
adapter
(see
Section
3-2A).
Connect
power
cable
adapter
to
weld
output
terminal
(Figures
3-2 and
3-3).
B.
High
Performance Cable
Assembly
The
high
performance
cable
assembly
has
separate
power
cable
and gas hose.
To install power
cable,
connect power
cable
connector
to
weld
output
terminal
(Figures
3-2 and
3-3).
SECTION
4- SEQUENCE OF
OPERATION
WARNING
_________
ELECTRIC SHOCK
can
kill.
Do
not
touch five electrical
parts.
Keep
all
covers
and
handle
in
place
white
operating.
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.
Ventilate
to
keep
from
breathing
fumes and gases.
If
ventilation
is
inadequate,
use
approved
breathing
apparatus.
METAL, SPATTER,
AND SLAG
can cause
fire
burns.
Watch for fire.
Have
a
fire
extinquisher nearby,
and know how
to
use.
Allow work and
equipment
to
cool before handl
ing.
MAGNETIC FIELDS FROM HIGH CURRENTS
can
affect
pacemaker operation.
Wearers should consult with their doctor before
going
near arc
welding,
gouging,
or
spot
welding
operations.
See Section
1
-
Safety
Rules for
additional
safety
infor
mation.
4.
Set
power
source
for desired
welding
amperage.
5.
Wear
dry
insulating clothing
and
gloves
and
welding
helmet with proper filter lens
according
to
ANSI Z49.1.
6.
Energize welding
power
source.
7.
Set gas flow
to
desired level
(requires
open gas
valve).
IMPORTANT:
_________
Purge
gas hose
to
clear hose of
air,
moisture,
or
any
other contaminants. Allow gas
to
flow
2
to
3 minutes
on new
torch;
5
to
6
seconds thereafter.
IMPORTANT As
a
general
rule,
allow 10 seconds of
gas
postflow
time
per 100 amperes of weld
current
before
closing
valve.
2.
Turn off
welding
power
source.
4
-
1. GAS TUNGSTEN
ARC WELDING
(GTAW)
1.
Install and
connect
torch
according
to
Section 3.
2.
Make
sure
backup
and all gas connections
are
securely
tightened.
3.
With
regulator/flowmeter
valve
closed,
open gas
cylinder
valve.
3.
Turn off the
shielding
gas and coolant
supplies
at
their
sources.
L~~U~E
HIGH
CONCENTRATION
OF
SHIELDING
GAS
can
harm health
or
kill.
Shut
off gas
supply
when
not
in
use.
HOT
and
.
8.
Begin welding.
4 -2.
SHUTTING DOWN
1.
Stop welding.
OM-1559
Page
6
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