Lincoln Electric Commander 500 Cummins Operator's Manual page 25

B-8
Table B.3 TYPICAL CURRENT RANGES
Tungsten
Electrode
Diameter
in. (mm)
0 .010 (.25)
0.020 (.50)
0.040 (1.0)
1/16 (1.6)
3/32 (2.4)
1/8 (3.2)
5/32 (4.0)
3/16 (4.8)
1/4 (6.4)
(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:
(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.
COMMANDER 500 CUMMINS SETTINGS WHEN
USING THE K799 HI-FREQ UNIT
• Set the WELD MODE switch to the "20-250 setting"
(TIG)
• Set the IDLER switch to the "HIGH" position.
• Set the WELDING TERMINALS switch to the "Weld
Terminals On" position. This will close the solid state
contactor and provide an always "hot" electrode.
(Note: This is necessary because the K799 circuitry with
respect to the #2 and #4 leads does not provide the prop-
er signal to open and close the solid state contactor in the
COMMANDER 500 CUMMINS).
OPERATION
DCEN (-) DCEP (+)
1%, 2% 1%, 2%
Thoriated Thoriated
Tungsten Tungsten
2-15 (3)
5-20 (3)
15-80 (3)
70-150 10-20
150-250 15-30
250-400 25-40
400-500 40-55
500-750 55-80
750-1000 80-125
EWP
EWTh-1
EWTh-2
# 4 = 1/4 in.
# 5 = 5/16 in.
# 6 = 3/8 in.
# 7 = 7/16 in.
# 8 = 1/2 in.
#10 = 5/8 in.
COMMANDER 500 CUMMINS
(1)
FOR TUNGSTEN ELECTRODES
Approximate Argon Gas Flow Rate
C.F.H. (l/min.)
Aluminum Stainless Steel
3-8 (2-4) 3-8 (2-4)
5-10 (3-5) 5-10 (3-5)
5-10 (3-5) 5-10 (3-5)
5-10 (3-5) 9-13 (4-6)
13-17 (6-8) 11-15 (5-7)
15-23 (7-11) 11-15 (5-7)
21-25 (10-12) 13-17 (6-8)
23-27 (11-13) 18-22 (8-10)
28-32 (13-15) 23-27 (11-13)
(6 mm)
(8 mm)
(10 mm)
(11 mm)
(12.5 mm)
(16 mm)
COMMANDER 500 CUMMINS SETTINGS WHEN
USING THE K930-1 TIG MODULE
• Set the WELD MODE switch to the "20-250 Setting"
(TIG).
• Set the IDLER switch to the "AUTO" position.
• Set the WELDING TERMINALS switch to the "Remotely
Controlled" position. This will keep the solid state con-
tactor open and provide a "cold" electrode until the trig-
gering device (Amptrol or Arc Start Switch) is pressed.
B-8
(2)
TIG TORCH
Nozzle
Size (4), (5)
#4, #5, #6
#5, #6
#6, #7, #8
#8, #10