Lincoln Electric SVM153-A Table B.3 Typical Current RANGES1 for Tungsten ELECTRODES2, TIG Torch

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B-10				OPERATION					B-10
		TABLE B.3 – TYPICAL CURRENT RANGES1 FOR TUNGSTEN ELECTRODES2
					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		Size4, 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)

1When used with argon gas. The current ranges shown must be reduced when using argon/helium or pure helium shielding gases.

2Tungsten electrodes are classified as follows by the American Welding Society (AWS):

Pure	EWP
1% Thoriated	EWTh-1
2% Thoriated	EWTh-2

2Though not yet recognized by the AWS, Ceriated Tungsten is now widely accepted as a substitute for 2% Thoriated Tungsten in AC and DC

applications.
3DCEP is not commonly used in these sizes.
4TIG 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)

5TIG 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.

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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.

COMMANDER 500