Miller Electric 152, 175 SECTION 7 SELECTING AND PREPARING TUNGSTEN ELECTRODE

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 W ave 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.