B-7
OPERATION
CROSS COUNTRY 300
TYPICAL CURRENT RANGES
(1)
FOR TUNGSTEN ELECTRODES
(2)
Tungsten Electrode DCEN (-) DCEP (+)
Approximate Argon Gas Flow
TIG TORCH
Diameter in. (mm)
Flow Rate C.F.H. ( l /min.)
Nozzle Size (4), (5)
1%, 2% Thoriated
1%, 2% Thoriated
Aluminum
Stainless Steel
Tungsten
Tungsten
.010 (.25) 2-15
(3)
3-8 (2-4)
3-8
(2-4)
#4, #5, #6
0.020
(.50) 5-20
(3)
5-10
(3-5)
5-10
(3-5)
0.040
(1.0) 15-80
(3)
5-10
(3-5)
5-10
(3-5)
1/16
(1.6) 70-150
10-20
5-10
(3-5)
9-13
(4-6)
#5, #6
3/32
(2.4) 150-250
15-30
13-17 (6-8)
11-15
(5-7)
#6, #7, #8
1/8
(3.2)
250-400
25-40
15-23 (7-11)
11-15
(5-7)
5/32
(4.0) 400-500
40-55
21-25
(10-12)
13-17
(6-8)
#8, #10
3/16
(4.8) 500-750
55-80
23-27 (11-13)
18-22
(8-10)
1/4
(6.4)
750-1000
80-125
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 gases.
(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 "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 = _ 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.
TABLE B.4
Figure B.9
TIG Setup - TIG 1-Piece Cable
