Section 10 − Selecting And Preparing Tungsten Electrode For Dc Or Ac Welding; Selecting Tungsten Electrode (Wear Clean Gloves To Prevent Contamination Of Tungsten) - Miller Syncrowave 250 DX Technical Manual

SECTION 10 − SELECTING AND PREPARING TUNGSTEN
ELECTRODE FOR DC OR AC WELDING
Y Whenever possible and practical, use DC weld output instead of AC weld output.
10-1. Selecting Tungsten Electrode (
Electrode Diameter
2% Ceria (Orange Band), 1.5% Lan-
thanum (Gray Band), Or 2% Thorium
(Red Band) Alloy Tungstens
.010"
.020"
.040"
1/16"
3/32"
1/8"
5/32"
3/16"
1/4"
Pure Tungsten
(Green Band)
.010"
.020"
.040"
1/16"
3/32"
1/8"
5/32"
3/16"
1/4"
Zirconium Alloyed Tungsten (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).
Figures listed are a guide and are a composite of recommendations from American Welding Society (AWS) and electrode manufacturers.
TM-359 Page 98
Wear Clean gloves To Prevent Contamination Of Tungsten
Amperage Range - Gas Type
DC − Argon − Electrode DC − Argon − Elec-
Negative/Straight Po- trode Positive/Rev-
larity
Up to 25
15-40
25-85
50-160
135-235
250-400
400-500
500-750
750-1000
Up to 15
5-20
15-80
70-150
125-225
225-360
360-450
450-720
720-950
*
*
*
*
*
*
*
*
*
♦
- Polarity
AC − Argon
erse Polarity
* Up to 20
* 15-35
* 20-80
10-20 50-150
15-30 130-250
25-40 225-360
40-55 300-450
55-80 400-500
80-125 600-800
* Up to 15
* 5-20
* 10-60
10-20 50-100
15-30 100-160
25-40 150-210
40-55 200-275
55-80 250-350
80-125 325-450
* Up to 20
* 15-35
* 20-80
* 50-150
* 130-250
* 225-360
* 300-450
* 400-550
* 600-800
*Not Recommended.
ac/dc_gtaw 2/2000
)
AC − Argon −
Balanced Wave
Up to 15
5-20
20-60
60-120
100-180
160-250
200-320
290-390
340-525
Up to 10
10-20
20-30
30-80
60-130
100-180
160-240
190-300
250-400
Up to 15
5-20
20-60
60-120
100-180
160-250
200-320
290-390
340-525
Syncrowave 250 DX