1. selecting tungsten electrode – Miller Electric 152 User Manual
Page 28
OM-206 Page 24
SECTION 7 – SELECTING AND PREPARING
TUNGSTEN ELECTRODE
gtaw 7/97
For additional information, see your distributor for a handbook on the Gas
Tungsten Arc Welding (GTAW) process.Wear clean gloves to prevent
contamination of tungsten electrode.
NOTE
7-1.
Selecting Tungsten Electrode
Amperage Range - Gas Type
♦
- Polarity
Electrode Diameter
DC – Argon – Electrode
Negative/Straight Polarity
DC – Argon – Electrode
Positive/Reverse Polarity
AC – Argon – Using
High Frequency
AC – Argon – Balanced
Wave Using High Freq.
Pure Tungsten
(Green Band)
.010”
Up to 15
*
Up to 15
Up to 10
.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
80-125
325-450
250-400
2% Thorium Alloyed
Tungsten (Red Band)
.010”
Up to 25
*
Up to 20
Up to 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 Tung-
sten (Brown Band)
.010”
*
*
Up to 20
Up to 15
.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
♦
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 Society (AWS) and electrode
manufacturers.