Lincoln Electric SVM145-B service manual Commander 300 Settings When Using the K799 HL-FREQ Unit

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B-10				OPERATION						B-10
		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				Aluminum		Stainless Steel		Nozzle
			Thoriated	Thoriated
	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	180-125	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 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).

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 REMOTELY CON- 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.

COMMANDER 300