Lincoln Electric IM830 manual Typical Current Ranges 1 for Tungsten ELECTRODES2

B-5					OPERATION				B-5
				SUMMARY OF WELDING PROCESSES
				CONTROL			ELECTRODE
				CABLE		IDLE	WHEN NOT		TO START
		PROCESS		USED		MODE	WELDING		WELDING
	STICK			No		AUTO	Hot		Touch electrode to work.
									Welding starts immediately
									and engine goes to high
									idle.
	WIRE FEED, LN-25 WITH			No		AUTO	Cold		Press gun trigger, LN-25
	INTERNAL CONTACTOR								contactor closes. Welding
									starts immediately and
									engine goes to high idle.
									NOTE: Output Control
									must be set above “3”
	TIG, TIG MODULE WITH			Yes		High	Cold		Press Arc Start Switch
	WITH CONTACTOR KIT								contactor closes,
	CONTROL CABLE, & ARC								welding starts immediately.
	START SWITCH
	WIRE FEED, LN-15			No		AUTO	Cold		Press gun trigger.
	ACROSS the ARC								LN-15 contactor closes,
	(has internal contactor)								Welding starts immediately
									Note: Output Control must
									be set above “3”.
		TYPICAL CURRENT RANGES (1) FOR TUNGSTEN ELECTRODES(2)
	Tungsten Electrode		DCEN (-)	DCEP (+)	Approximate Argon Gas Flow				TIG TORCH
	Diameter in. (mm)				Flow Rate C.F.H. ( l /min.)				Nozzle Size (4), (5)
			1%, 2% Thoriated	1%, 2% Thoriated	Aluminum		Stainless Steel
			Tungsten	Tungsten
	.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)

(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

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)
# 5	= 5/16 in.	(8 mm)
# 6	= 3/8 in.	(10 mm)
# 7	= 7/16 in.	(11 mm)
# 8	= _ in.	(12.5 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 breakage, but cannot withstand high temperatures and high duty cycles.

EAGLE 10,000