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COMMANDER 400 SETTINGS WHEN USING THE
K799 HI-FREQ UNIT
1. Set the OUTPUT RANGE switch to the 50-575 setting
(Fabrication and General Purpose).
2. Set the IDLER switch to the “HIGH “ position.
3. Set the LOCAL/REMOTE switch to the “REMOTE”
position.
4. Set the WELDING TERMINALS switch to the “WELD-
ING 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).
COMMANDER 400 SETTINGS WHEN USING THE
K930-1 TIG MODULE
1. Set the OUTPUT RANGE switch to the 50-575 Setting
(Fabrication and General Purpose).
2. Set the IDLER switch to the “AUTO “ position.
3. Set the LOCAL/REMOTE switch to the “REMOTE”
position.
4. Set the WELDING TERMINALS switch to the “WELD-
ING TERMINALS REMOTELY CONTROLLED” posi-
tion. This will keep the solid state contactor open and
provide a “cold” electrode until the triggering device
(Amptrol or Arc Start switch) is pressed.
OPERATION
B-11 B-11
COMMANDER 400
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Tungsten
Electrode
Diameter
in. (mm)
2-15
5-20
15-80
70-150
150-250
250-400
400-500
500-750
750-1000
3
3
3
10-20
15-30
25-40
40-55
55-80
80-125
3-8 (2-4)
5-10 (3-5)
5-10 (3-5)
5-10 (3-5)
13-17 (6-8)
15-23 (7-11)
21-25 (10-12)
23-27 (11-13)
28-32 (13-15)
3-8 (2-4)
5-10 (3-5)
5-10 (3-5)
9-13 (4-6)
11-15 (5-7)
11-15 (5-7)
13-17 (6-8)
18-22 (8-10)
23-27 (11-13)
TIG TORCH
Nozzle
Size
4,5
Approximate Argon Gas Flow Rate
C.F.H. (l/min.)
DCEN (-) DCEP (+)
#4, #5, #6
#5, #6
#6, #7, #8
#8, #10
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%, 2%
Thoriated
Tungsten
1%, 2%
Thoriated
Tungsten
Aluminum Stainless Steel
Table B.3 TYPICAL CURRENT RANGES
1
FOR TUNGSTEN ELECTRODES
2
1
When used with argon gas. The current ranges shown must be reduced when using argon/helium or pure helium shield-
ing 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 = 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.