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SECTION
5
-
MAINTENANCE
5
-
1.
INSPECTION
AND
UPKEEP
-
Usage
and
shop
conditions will determine
frequency
and
type
of
maintenance
required.
Perform
inspections
once
a
week.
WARNING
_________
ELECTRIC
SHOCK
can
kill;
HOT
SURFACES
can cause severe
burns.
Do
not
touch live electrical
parts.
Shut down
we/ding
power
source
before
working
on
torch.
Disconnect torch from
welding
power
source
before
inspecting, maintaining,
or
servicing.
Allow
a
cooling period
before
servicing.
1.
Inspect
torch for broken
areas,
cracks and loose
parts;
tighten, repair
and
replace
as
required.
2.
Remove grease and dirt from
components,
and
moisture from
electrical
parts
and cables.
B.
Power Cable
Inspect
cables for breaks in
insulation,
and
ensure
that
all
connections
are
clean and
tight. Repair
or
replace
cables if
insulation breaks
are
present.
Clean and
tighten
connections
at
each
inspection.
5
-
4.
PREPARING
TUNGSTEN
ELECTRODES
(Figure
5-1)
t~Uiis1~
HOT FLYING METAL
PARTICLES
can
injure
personnel,
start
fires, and
damage equip
ment;
TUNGSTEN CONTAMINATION
can
lower
weld
quality.
Shape
tungsten
electrode
only
with
properly
guarded grinder
in
a
safe location
wearing
proper
face,
hand,
and
body
protection.
Do
not
use same
wheel for
any other
job
or
the
tungsten
will become
contaminated.
WARNING
_________
ELECTRIC
SHOCK
can
kill;
HOT
SURFACES
can cause severe
burns.
Do
not
touch live electrical
parts.
Shut down
welding
power
source
before
working
on
torch.
Disconnect torch from
welding
power
source
before
inspecting, maintaining,
or
servicing.
Allow
a
cooling period
before
servicing.
Once
a
week
inspect
condition
of torch
body
com
ponents.
Replace
cup, heat
shield, backcap,
and
0-rings
if crack
ed. Maintain
tight
fit of torch
components
to
ensure
good
wed
quaity.
5 -3.
INSPECTING HOSES, CONNECTIONS
AND
CABLES
WARNING
_________
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
inspecting, maintaini,?g,
or ser
vicing.
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.
Once
a
week
inspect
hoses and connections.
Tungsten
electrode
shaping
should
be done
on a
fine
grit,
hard abrasive wheel. Since
tungsten
is harder than
most
grinding
wheels, causing
the
tungsten
to
be
chip
ped
away rather than
cut
away, the
grinding
marks
should
run
lengthwise
with the electrode.
For
additional
information,
see
your
distributor
or re
quest
a
handbook
from
factory
on
the
Gas
Tungsten
Arc
Welding
(GTAW)
process.
A.
Gas Hose
TA-IZO
630
Gas leaks
may
result in
poor weld
quality. Inspect
hoses
for breaks.
Keep
connections clean
and
tight.
Figure
5
-
1.
Tungsten Preparation
5 -2. TORCH BODY MAINTENANCE
(Figure
3-1)
TUNGSTEN PREPARATION: IDEAL
Stable
Arc
Straight
Ground
Flat
(the
DIa. of
Flat Governs
Amperage Capacity)
TUNGSTEN PREPARATION: WRONG
Arc Wander
,
~~~iiII
Point
Radial
OM-1 559
Page
7
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