Lincoln Electric COMMANDER IM544-B Operator's Manual page 21

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 400 SETTINGS WHEN USING THE
K799 HI-FREQ UNIT
a. Set the OUTPUT RANGE switch to the "50-575 set-
ting" (Fabrication and General Purpose)
b. Set the IDLER switch to the "High " position.
c. Set the LOCAL/REMOTE switch to the "Remote" posi-
tion.
d. Set the WELDING TERMINALS switch to the "Welding
Terminals Always 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).
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 400
(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 400 SETTINGS WHEN USING THE
K930-1 TIG MODULE
a. Set the OUTPUT RANGE switch to the 50-575 Setting
(Fabrication and General Purpose)
b. Set the IDLER switch to the "Auto " position.
c. Set the LOCAL/REMOTE switch to the "Remote" posi-
tion.
d. Set the WELDING TERMINALS switch to the "Welding
Terminals Remotely Controlled"
keep the solid state contactor open and provide a
"cold" electrode until the triggering 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
position. This will