Lincoln Electric GX 271 Wire Welding, Table B.2 Typical Current Ranges 1 for Tungsten ELECTRODES2

B-8				OPERATION				B-8
		Table B.2 TYPICAL CURRENT RANGES (1) FOR TUNGSTEN ELECTRODES(2)
			DCEN (-)	DCEP (+)	Approximate Argon Gas Flow Rate
	Tungsten				C.F.H. (l/min.)
	Electrode						TIG TORCH
			1%, 2%	1%, 2%
	Diameter						Nozzle
			Thoriated	Thoriated	Stainless Steel
	in. (mm)						Size (4), (5)
			Tungsten	Tungsten
	0 .010	(.25)	2-15	(3)	3-8	(2-4)	#4, #5, #6
	0.020	(.50)	5-20	(3)	5-10	(3-5)
	0.040	(1.0)	15-80	(3)	5-10	(3-5)
	1/16	(1.6)	70-150	10-20	9-13	(4-6)	#5, #6
	3/32	(2.4)	150-250	15-30	11-15	(5-7)	#6, #7, #8
	1/8	(3.2)	250-400	25-40	11-15	(5-7)
	5/32	(4.0)	400-500	40-55	13-17	(6-8)	#8, #10
	3/16	(4.8)	500-750	55-80	18-22	(8-10)
	1/4	(6.4)	750-1000	80-125	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	= 1/2 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.

WIRE WELDING

Connect a wire feeder to the GX-271 and set welder controls according to the instructions on the appropri- ate wire feeder connection diagram.

The GX-271 in the ”WIRE FEED” position, permits it to be used with a broad range of flux cored wire (Innershield and Outershield) electrodes and solid wires for MIG welding (gas metal arc welding). Welding can be finely tuned using the “ARC CON- TROL”.

Some recommended Innershield electrodes are: NR- 311, NS-3M, NR-207, NR-203 Ni 1%, NR-204-H.

Recommended Outershield electrodes are: 0S-70, 0S-71M.

Some recommended solid wires for MIG welding are:

.035 (0.9 mm) and .045 (1.1 mm) L-50, L-56, and Blue Max MIG 308 LS.

For any electrodes, including the above recommenda- tions, the procedures should be kept within the rating of the machine. For additional electrode information, see Lincoln publications N-675, GS-100 and GS-210.

GX 271 Chopper