OPERATION

TIG WELDING INFORMATION

TABLE 14

TYPICAL CURRENT RANGES (1) FOR TUNGSTEN ELECTRODES (2)

 

 

 

 

 

 

AC

 

 

 

Approximate Argon

 

 

 

 

 

 

 

 

 

 

 

 

Gas Flow Rate

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DCEN ( - )

DCEP ( + )

 

Unbalanced Wave

Balanced Wave

 

 

 

 

 

 

C.F.H. (1/min.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1%, 2%

 

1%, 2%

 

 

 

 

 

Tungsten

 

 

 

 

 

 

 

 

 

 

Electrode

 

1%, 2%

1%, 2%

 

 

Thoriated

 

Thoriated

 

 

 

 

TIG Torch

Diameter

 

Thoriated

Thoriated

 

Pure

Tungsten

Pure

Tungsten

 

 

Stainless

 

Nozzle

in. (mm)

 

Tungsten

Tungsten

 

Tungsten

Zirconiated

Tungsten

Zirconiated

 

Aluminum

Steel

 

Size (4), (5)

.010

(.25)

2-15

(3)

2-15

2-15

2-15

---

3-8

(2-4)

3-8

(2-4)

#4, #5, #6

0.020

(.50)

5-20

5-15

5-20

10-20

5-20

5-10

(3-5)

5-10

(3-5)

 

(3)

 

0.040

(1.0)

15-80

10-60

15-80

20-30

20-60

5-10

(3-5)

5-10

(3-5)

 

(3)

 

1/16

(1.6)

70-150

10-20

50-100

70-150

30-80

60-120

5-10

(3-5)

9-13

(4-6)

#5, #6

3/32

(2.4)

150-250

15-30

100-160

140-235

60-130

100-180

13-17 (6-8)

11-15

(5-7)

#6, #7, #8

1/8

(3.2)

250-400

25-40

150-210

225-325

100-180

160-250

15-23 (7-11)

11-15 (5-7)

 

5/32

(4.0)

400-500

40-55

200-275

300-400

100-240

200-320

21-25 (10-12)

13-17

(6-8)

#8, #10

3/16

(4.8)

500-750

55-80

250-350

400-500

190-300

290-390

23-27 (11-13) 18-22(8-10)

 

1/4

(6.4)

750-1000

80-125

325-450

500-630

250-400

340-525

28-32 (13-15)

23-27(11-13)

 

(1)When used with argon gas. The current ranges shown must be reduced when using argon/helium or pure helium shielding gasses.

(2)Tungsten electrodes are classified as follows by the American Welding Society (AWS): Pure . . . . . . . . . . . . . . . EWP

1% Thoriated . . . . . . . . EWTh-1 2% Thoriated . . . . . . . . EWTh-2

Though not yet recognized by the AWS, Ceriated Tungsten is now widely accepted as a substitute for 2% Thoriated Tungsten in AC and DC applications.

(3)DCEP is not commonly used in these sizes.

(4)TIG torch nozzle sizesare in multiples of 1/16ths of an inch:

#4

= 1/4 in.

(6 mm)

#5

= 5/16 in.

(8 mm)

#6

= 3/8 in.

(10 mm)

#7

= 7/16 in.

(11 mm)

#8

= 1/2 in.

(12.5 mm)

#10

= 5/8 in.

(16 mm)

(5)TIG torch nozzles are typically made from alumina ceramic. Special applications may require lava nozzles, which are less prone to breakage, but cannot withstand high temperatures and high duty cycles.

30

TIG MODULE

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Image 41
Lincoln Electric IM528-B manual TIG Welding Information, Typical Current Ranges 1 for Tungsten Electrodes