Specifications

Regulator!
Flowmeter
Torch
Figure
3
-
4.
GTAW Torch Connection
Diagram
SECTION
4
-
SEQUENCE OF
OPERATION
TA-120 870
WARNING
_________
ELECTRIC
SHOCK
can
kill.

Do
not
touch
live electrical
parts.

Keep
all
covers
and handle
in
place
while
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.
HOT
METAL,
SPAUER,
AND
SLAG
can
cause
fire
and 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.
4-1.
1.
2.
GAS
TUNGSTEN
ARC
WELDING
(GTAW)
Install
and
connect
torch
according
to
Section
3.
Make
sure
backup
and
all
gas
connections
are
securely
tightened.
3.
Turn
on
coolant
supply.
4.
With
regulator/flowmeter
valve
closed,
open gas
cylinder
valve.
5.
Set
power
source
for
desired
welding
amperage.
6.
Wear
dry insulating clothing
and
gloves
and
welding
helmet with
proper
filter
lens
according
to
ANSI
Z49.1.
7.
Energize welding
power
source.
8. 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.
9.
Begin
welding.
4
-2. SHUTI1NG DOWN
1.
Stop
welding.
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.
3.
Turn
off the
shielding
gas
and
coolant
supplies
at
their
sources.
~r~ti~U~E
HIGH
CONCENTRATION OF
SHIELDING
GAS
can
harm
health
or
kill.

Shut
off
gas
supply
when
not
in
use.
Coolant
Out
Coolant
Return
Work
Clamp
4
Coolant
In
Gas
Cylinder
OM-1568
Page
6