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B-6
DCEN (-)
Tungsten
Electrode
1%, 2%
Diameter
Thoriated
mm (in)
Tungsten
.25 (0.010)
2-15
.50 (0.020)
5-20
1.0 (0.040)
15-80
1.6 (1/16)
70-150
2.4 (3/32)
150-250
3.2 (1/8)
250-400
4.0 (5/32)
400-500
4.8 (3/16)
500-750
6.4 (1/4)
750-1000
(1)
When used with argon gas. The current ranges shown must be reduced when using argon/helium or pure helium shielding gases.
(2)
Tungsten electrodes are classified as follows by the American Welding Society (AWS):
Pure
1% Thoriated
2% Thoriated
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 "sizes" are 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.
OPERATION
Table B.3 TYPICAL CURRENT RANGES
FOR TUNGSTEN ELECTRODES
DCEP (+)
Approximate Argon Gas Flow Rate
1%, 2%
Thoriated
Aluminum
Tungsten
(3)
2-4 (3-8)
(3)
3-5 (5-10)
(3)
3-5 (5-10)
10-20
3-5 (5-10)
15-30
6-8 (13-17)
25-40
7-11 (15-23)
40-55
10-12 (21-25)
55-80
11-13 (23-27)
80-125
13-15 (28-32)
EWP
EWTh-1
EWTh-2
Vantage 500 DEUTZ
(1)
(2)
l/min (c.f.m.)
Stainless Steel
2-4 (3-8)
3-5 (5-10)
3-5 (5-10)
4-6 (9-13)
5-7 (11-15)
5-7 (11-15)
6-8 (13-17)
8-10 (18-22)
11-13 (23-27)
B-6
TIG TORCH
Nozzle
Size (4), (5)
#4, #5, #6
#5, #6
#6, #7, #8
#8, #10
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