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

Page 24
Image 24
Miller Electric CV-2 owner manual Green Band, Thorium Alloyed Tungsten Red Band, Zirconium Alloyed Tungsten Brown Band