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COMMANDER 500 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 proper signal to open and close the solid state con-
tactor in the Commander 500.
COMMANDER 500 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 contactor open and provide a “cold”
electrode until the triggering device (Amptrol or Arc
Start Switch) is pressed.
B-10 B-10
OPERATION
COMMANDER 500
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TABLE B.3 – TYPICAL CURRENT RANGES
1
FOR TUNGSTEN ELECTRODES
2
Approximate Argon Gas Flow Rate
DCEN (-) DCEP (+) C.F.H. (l/min.)
Tungsten
Electrode 1%, 2% 1%, 2% TIG TORCH
Diameter Thoriated Thoriated Nozzle
in. (mm) Tungsten Tunsten Aluminum Stainless Steel Size
4, 5
0.010 (.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)
0.40 (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
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) # 7 = 7/16 in. (11 mm)
# 5 = 5/16 in. (8 mm) # 8 = 1/2 in. (12.5 mm)
# 6 = 3/8 in. (10 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 break-
age, but cannot withstand high temperatures and high duty cycles.