Square Wave Tig - Lincoln Electric SQUARE WAVE IM467-B Operator's Manual

B-18
TYPICAL CURRENT RANGES
DCEN (-) DCEP (+)
Tungsten
Electrode 1%, 2%
Diameter Thoriated Thoriated
in. (mm) Tungsten Tungsten
.010 (.25) 2-15
0.020 (.50) 5-20
0.040 (1.0) 15-80
1/16 (1.6) 70-150
3/32 (2.4) 150-250
1/8 (3.2) 250-400
5/32 (4.0) 400-500
3/16 (4.8) 500-750
1/4 (6.4) 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 .................................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. (6mm)
# 5 = 5/16 in. (8mm)
# 6 = 3/8 in. (10mm)
# 7 = 7/16 in. (11mm)
#8 = 1/2 in. (12.5mm)
#10 = 5/8 in. (16mm)
(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. Currents above 350 amps require metal nozzles on water cooled torches.
OPERATION
Unbalanced Wave
1%, 2%
1%, 2% Thoriated
Pure Tungsten
Tungsten Zirconated
(3)
2-15 2-15
(3)
5-15 5-20
3)
( 10-60 15-80
10-20 50-100 70-150
15-30 100-160 140-235
25-40 150-210 225-325
40-55 200-275 300-400
55-80 250-350 400-500
80-125 325-450 500-630

SQUARE WAVE TIG 355

TABLE B.2
(1) FOR TUNGSTEN ELECTRODES
AC
Balanced Wave
1%, 2%
Thoriated
Pure Tungsten
Tungsten Zirconiated
2-15 —
10-20 5-20
20-30 20-60
30-80 60-120
60-130 100-180
100-180 160-250
100-240 200-320
190-300 290-390
250-400 340-525
(2)
Approximate Argon
Gas Flow Rate
C.F.H. (l/min)
TIG Torch
Stainless Nozzle
Aluminum Steel Size
3-8 (2-4) 3-8 (2-4) 4,5,6
5-10 (3-5) 5-10 (3-5)
5-10 (3-5) 5-10 (3-5)
5-10 (3-5) 9-13 (4-6) 5,6
13-17 (6-8) 11-15 (5-7) 6,7,8
15-23 (7-11) 11-15 (5-7)
21-25 (10-12) 13-17 (6-8) 8,10
23-27 (11-13) 18-22 (8-10)
28-32 (13-15) 23-27 (11-13)
B-18
(4), (5)