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Grind
the end of the
tungsten
electrode
to
a
taper
for
a
distance of 2
to
2-1/2
electrode diameters in
length.
For
example,
the
ground
surface for
a
1/8
in.
(3.2 mm)
di
ameter
tungsten
electrode should be
1/4
to
5/16
in.
(6.4
to
8.0
mm) long.
TUNGSTEN PREPARATION: IDEAL
Stable Arc
Straight
~
Fiat
(The
Dia. Of This
Fiat
Governs
Amperage Capacity)
For additional
information,
see
your distributor for
a
handbook
on
the Gas
Tungsten
Arc
Welding (GTAW)
process.
TUNGSTEN PREPARATiON: WRONG
Arc Wander
Point
S-0162
Figure
6-2.
Tungsten Preparation
Table 6-2.
Tungsten
Size
Electrode Diameter
Amperage Range
-
Polarity
-
Gas
Type
Pure
Tungsten
(Green Band)
DC-Argon
Electrode
Negative/Straight Polarity
DC-Argon
Electrode
Positive/Reverse
Polarity
AC-Argon Using
High Frequency
AC-Argon
Balanced
Wave
Using High Freq.
.010
.020
Uptol5
5-20
*
*
Uptol5
5-20
UptolO
10-20
.040
15-80
*
10-60
20-30
1/16
70-150
10-20
50-100
30-80
3/32.
125-225
15-30
100-160
60-130
1/8
225-360
25-40
150-210
100-180
5/32
360-450
40-55
200-275
160-240
3/16
450-720
55-80
250-350
190-300
1/4
720-950
80-1 25
325-450
250-400
2%
ThorIum
Alloyed
Tungsten
(Red Band)
.010
Upto25
*
Upto2O
Uptol5
.020
15-40
*
15-35
5-20
.040
25-85
*
20-80
20-60
1/16
50-160
10-20
50-150
60-120
3/32
135-235
15-30
130-250
100-180
1/8
250-400
25-40
225-360
160-250
5/32
400-500
40-55
300-450
200-320
3/16
500-750
55-80
400-500
290-390
1/4
750-1000
80-125
600-800
340-525
Zirconium
Alloyed
Tungsten
(Brown Band)
.010
.020
.040
1/16
3/32
1/8
5/32
3/16
1/4
*
*
*
*
*
~
*
*
*
*
*
*
*
*
*
~
*
*
Upto2O
15-35
20-80
50-150
130-250
225-360
300-450
400-550
600-800
Uptol5
5-20
20-60
60-120
100-180
160-250
200-320
290-390
340-525
*NOT RECOMMENDED
The
figures
listed
are
intended
as a
guide
and
are a
composite
of recommendations from American
Welding
Society (AWS)
and electrode manufacturers.
S-000gf888
Radial Ground
OM-1558
PageS
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