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SECTION
5
SEQUENCE OF
OPERATION
a
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.
Keep
your
head out of (he
fumes.
Ventilate
to
keep
from
breathing
fumes and
gases.
If ventilation is
inadequate,
use
approved
breathing
device.
HOT
METAL, SPATTER,
AND
SLAG
can
cause
tire and burns.
Watch for fire.
Keep
a
fire
extinguisher nearby,
and know
how
to
use
it.
Do
not
use near
flammable material.
Allow work and
equipment
to
cool before
handling.
MAGNETIC FIELDS FROM HIGH CURRENTS
can
affect
pacemaker operation.
Wearers should consult their doctor before
going
neararc
welding, gouging,
or
spot
weld
ing operations.
See Section
1
-
Safety
Rules for additional
information.
5-1.
GAS TUNGSTEN ARC WELDING
(GTAW)
1.
Install and
connect
torch
according
to
Section
4.
2.
Make
sure
backcap
and all
gas connections
are
securely tightened.
3.
With
regulator/flowmeter
valve
closed,
open gas
cylinder
valve.
4.
Set power
source
for desired
welding
amperage.
5.
Wear
dry insulating gloves
and
clothing,
and
wear
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
clearhose of
air,
mois
ture,
or
any other contaminants. Allow gas
to
flow
2 to 3
minutes
on new
torch;
5 to 6 seconds
thereafter.
8.
Begin welding.
5-2.
SHUTTING
DOWN
1.
Stop welding.
IMPORTANT: As
a
general
rule,
allow 10 seconds of
gas
postflow
time
per 100 amperes of weld
current
be
fore
closing
valve.
2.
Turn off
welding
power
source.
3.
Turn off the
shielding
gas
at
the
source.
a
WARNING:
HIGH
CONCENTRATION
OF
SHIELDING GAS
can
harm health
or
kill.
Shut off gas
supply
when not in
use.
SECTION
6
MAINTENANCE
6-1.
ROUTINE MAINTENANCE
(Table 6-1)
a
WARNING: ELECTRIC SHOCK
can
kill;
HOT
SURFACES
can cause severe
burns.
Do
not
touch live electrical
parts.
Shut
down
welding
power
source
and discon
nect
input
power before
working
on
torch.
Disconnect
torch from
welding
power
source
before
inspecting, maintaining,
or
sen/icing.
Allow
a
cooling period
before
servicing.
Table 6-1. Maintenance Schedule
Frequency*
Maintenance
Every
Week
Inspect
and clean
torch, cables,
and hoses
(see
Sections 6-lA
thru
6-iC).
Check and
replace
torch
parts
or
weld cables
as
necessary
(see
Sections 6-lA thru
6-10).
*Frequency
of service is based
on
uruts
operated
40 hours per week. Increase
frequency
of maint
enance
if
usage
exceeds 40 hours per week.
OM-1561
Page
6
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