Lincoln Electric SVM133-B Table B.3 Typical Current RANGES1 for Tungsten ELECTRODES2

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B-11				OPERATION						B-11
		Table B.3 TYPICAL CURRENT RANGES1 FOR TUNGSTEN ELECTRODES2
			DCEN (-)	DCEP (+)	Approximate Argon Gas Flow Rate
	Tungsten					C.F.H. (l/min.)
	Electrode								TIG TORCH
			1%, 2%	1%, 2%
	Diameter								Nozzle
			Thoriated	Thoriated	Aluminum		Stainless Steel
	in. (mm)								Size 4,5
			Tungsten	Tungsten
	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)
	0.040	(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 shield- ing gases.

2Tungsten 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.

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)
# 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)

5TIG 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.

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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.

COMMANDER 400