Lincoln Electric SVM150-A Stick Welding, Constant Current CC-STICK Welding, Pipe Welding

B-8 B-8

OPERATION

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STICK WELDING

The Ranger 250 can be used with a broad range of DC stick electrodes.

The MODE switch provides two stick welding settings as follows:

CONSTANT CURRENT (CC-STICK) WELDING

The CC-STICK position of the MODE switch is designed for horizontal and vertical-up welding with all types of electrodes, especially low hydrogen. The OUTPUT control adjusts the full output range for stick welding.

The ARC control sets the short circuit current during stick welding (arc-force). Increasing the number from -10 to +10 increases the short circuit current and pre- vents sticking of the electrode to the plate while weld- ing. This can also increase spatter. It is recommended that the ARC control be set to the minimum number without electrode sticking. Start with the dial set at 0.

PIPE WELDING

This slope-controlled setting is intended for “out-of- position” and “downhill” pipe welding where the opera- tor would like to control the current level by changing the arc length. The OUTPUT control dial adjusts the full output range for pipe welding. The ARC control is not active in the PIPE mode.

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TABLE B.2 – 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.

RANGER 250