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Preparing Tungsten
Figure
5-1.
Preparing Tungsten
For AC Or DC Electrode Positive
(DCEP) Welding
a
CAUTION
FLYING SPARKS AND HOT METAL
can cause
injury
and
start
fires.
Shape
tungsten
electrode
only
on
grinder
with
proper
guards
in
a
safe
location
wearing
proper
face, hand,
and
body protection.
Keep
flammables away.
warn2.1 9/91
Ref.
S-0161
1
Stable
Arc
2
2
Flat
4
3
Diameter of this flat determines
amperage
capacity.
3
Grinding
Wheel
4
Straight
Ground
Ideal
Tungsten Preparation
Stable
Arc
Ref.
S-0162
Figure
5-2.
Preparing Tungsten
For DC Electrode
Negative (OCEN) Welding
1
Tungsten
Electrode
2
Balled End
N
Ball end of
tungsten
before
welding
by applying
either
an ac
amperage
Electrode Diameter
mendedforagiven
electrode diam
______________________
1-1/2 Times
slightly higher
than what is
recom
eter
(see
Table
5.1),
or
a
dc elec
trode
positive
amperage.
2
Ref.
S-0161
\
p
2
2-1/2 Times
Electrode Diameter
1
Tungsten
Electrode
2
Tapered
End
Grind end of
tungsten
on
fine
grit,
hard
abrisive
wheel before weld
ing.
Do
not
use
wheel for other
jobs
or
tungsten
can
become contami
nated
causing
lower weld
quality.
Wrong Tungsten Preparation
Wandering
Arc
1
Arc Wander
2
Point
3
Grinding
Wheel
4
Radial Ground
Ref. S-0162
OM-1 568
Page
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