Section 8 − Selecting And Preparing; Tungsten Electrode; Selecting Tungsten Electrode - Miller Electric MARK VIII-2 Owner's Manual

SECTION 8 − SELECTING AND PREPARING
NOTE

8-1. Selecting Tungsten Electrode

Electrode Diameter
Negative/Straight Polarity
Pure Tungsten
(Green Band)
.010"
.020"
.040"
1/16"
3/32"
1/8"
5/32"
3/16"
1/4"
2% Thorium Alloyed
Tungsten (Red Band)
.010"
.020"
.040"
1/16"
3/32"
1/8"
5/32"
3/16"
1/4"
Zirconium Alloyed Tung-
sten (Brown Band)
.010"
.020"
.040"
1/16"
3/32"
1/8"
5/32"
3/16"
1/4"
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.
OM-218 Page 28

TUNGSTEN ELECTRODE

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.
DC − Argon − Electrode DC − Argon − Electrode
Positive/Reverse Polarity
Up to 15
5-20
15-80
70-150
125-225
225-360
360-450
450-720
720-950
Up to 25
15-40
25-85
50-160
135-235
250-400
400-500
500-750
750-1000
*
*
*
*
*
*
*
*
*
Amperage Range - Gas Type
AC − Argon − Using
High Frequency
*
*
*
10-20
15-30
25-40
40-55
55-80
80-125
*
*
*
10-20
15-30
25-40
40-55
55-80
80-125
*
*
*
*
*
*
*
*
*
- Polarity
AC − Argon − Balanced
Wave Using High Freq.
Up to 15 Up to 10
5-20 10-20
10-60 20-30
50-100 30-80
100-160 60-130
150-210 100-180
200-275 160-240
250-350 190-300
325-450 250-400
Up to 20 Up to 15
15-35 5-20
20-80 20-60
50-150 60-120
130-250 100-180
225-360 160-250
300-450 200-320
400-500 290-390
600-800 340-525
Up to 20 Up to 15
15-35 5-20
20-80 20-60
50-150 60-120
130-250 100-180
225-360 160-250
300-450 200-320
400-550 290-390
600-800 340-525
gtaw 7/97