the tungsten will become contaminated.
OM-880 Page 20
Do not use same wheel for any other job or
•
B. For DC Electrode Negative Welding (Figures 6-2 And 6-3)
CAUTION: HOT FLYING METAL PARTICLES can injure personnel, start fires, and dam- age equipment; TUNGSTEN CONTAMINA-
TION can lower weld quality.
• Shape tungsten electrode only on grinder with proper guards in safe location wearing proper face, hand, and body protection.
Table 6-2. Tungsten Electrode Size
Electrode Diameter | | Amperage Range - Polarity - Gas Type | |
| | | | |
Pure Tungsten | DC-Argon Electrode | DC-Argon Electrode | AC-Argon Using | AC-Argon Balanced |
(Green Band) | Negative/Straight Polarity | Positive/Reverse Polarity | High Frequency | Wave Using High Freq. |
| | | | |
.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 | | | | |
Tungsten | | | | |
(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 |
*NOT RECOMMENDED
The figures listed are intended as a guide and are a composite of recommendations from American Welding
Society (AWS) and electrode manufacturers. | S-0009/8-88 |
1-1/2 Times
Electrode
Diameter
2-1/2 Times
Electrode
Diameter
AC And DC | DC Electrode | |
Electrode Positive | Negative | S-0161 |
Figure 6-2. Properly Prepared Tungsten
Electrodes