Lincoln Electric COMMANDER SVM145-B Service Manual page 26

B-10
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 shield-
ing 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:
TIG torch nozzles are typically made from alumina ceramic. Special applications may require lava nozzles, which are
5
less prone to breakage, but cannot withstand high temperatures and high duty cycles.
COMMANDER 300 SETTINGS WHEN USING THE
K799 HL-FREQ UNIT
a. Set the SELECTOR switch to the "30-375" setting
(STICK/TIG).
b. Set the IDLER switch to the "HIGH" position.
c. Set the LOCAL/REMOTE switch to the "REMOTE"
position.
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 proper signal to open and close the solid state con-
tactor in the Commander 300).
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 180-125
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 300
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 300 SETTINGS WHEN USING THE
K930-1 TIG MODULE
a. Set the SELECTOR switch to the 30-375 Setting
(STICK/TiG).
b. Set the IDLER switch to the "AUTO" position.
c. Set the LOCAL/REMOTE switch to the "REMOTE"
position.
d. Set the WELDING TERMINALS switch to the
"WELDING TERMINALS
TROLLED" 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
2
TIG TORCH
Nozzle
Size 4 5
#4, #5, #6
#5, #6
#6, #7, #8
#8, #10
REMOTELY CON-