Miller MTL-20 Torches Manuale d'uso - Pagina 11
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5-
TUNGSTEN ELECTRODE
Typical
argon
shielding
gas flow rates
are
15
to
35 cfh
(cubic
feet per
hour).
*Not Recommended.
The
figures
listed
are
intended
as a
guide
and
are a
composite
of recommendations from American
Welding
manufacturers.
mod2.1 3/93
NOTE ~
For additional in
formation,
see
yourdistributorfora
handbook
on
the Gas
Tungsten
Arc
Welding (GTA W)
process.
Wear clean
gloves
to
prevent
contamination of
tungsten
electrode.
5-1.
Selecting Tungsten
Electrode
Table 5-1.
Tungsten
Size
Electrode Diameter
Amperage Range
-
Gas
Type,
-
Polarity
DC
Argon
Electrode
DC
Argon
Electrode
AC
Argon
Using
AC
Argon
Balanced
Negative/Straight PolarIty
Positive/Reverse
Polarity
High Frequency
Wave
Using High Freq.
Pure
Tungsten
(Green Band)
.
.010
Uptol5
Uptol5
UptolO
.020
5-20
*
5-20
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
Upto
15
.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
*
Upto2O
Uptol5
.020
15-35
5-20
.040
*
20-80
20-60
1/16
50-150
60-120
3/32
130-250
100-180
1/8
225-360
160-250
5/32
300-450
200-320
3/16
400-550
290-390
1/4
600-800
340-525
Society (AWS)
and electrode
S0009
OM-1568
Page
7