Lincoln Electric 305D manual Constant Current CC-STICK Welding, TIG Welding, Downhill Pipe Welding

b-5 OPERATION b-5

The Ranger® 305D 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

It is recommended that the ARC CONTROL be set to the minimum number without electrode sticking. Start with the dial set at 0.

TIG WELDING

The CC-STICK position of the MODE switch is designed							The TOUCH START TIG setting of the MODE switch is
for horizontal and vertical-up welding with all types of elec-							for DC TIG (Tungsten Inert Gas) welding. To initiate a
trodes, especially low hydrogen. The output CONTROL							weld, the CONTROL dial is first set to the desired current
dial adjusts the full output range for stick welding.							and the tungsten is touched to the work. During the time
							the tungsten is touching the work there is very little volt-
The ARC CONTROL dial sets the short circuit current							age or current and, in general, no tungsten contamina-
(arc-force) during stick welding to adjust for a soft or crisp							tion. Then, the tungsten is gently lifted off the work in a
arc. Increasing the number from -10(soft) to +10(crisp)							rocking motion, which establishes the arc.
increases the short circuit current and prevents sticking of
the electrode to the plate while welding. This can also							When in the TOUCH START TIG mode and when a
increase spatter. It is recommended that the ARC CON-							Amptrol is connected to the 6-Pin connector the OUT-
TROL be set to the minimum number without electrode							PUT dial is used to set the maximum current range of the
sticking. Start with the dial set at 0.							current control of the Amptrol.
DOWNHILL PIPE Welding							The ARC CONTROL is not active in the TIG mode. To
This slope controlled setting is intended for "out-of-posi-							STOP a weld, simply pull the TIG torch away from the
tion" and "down hill" pipe welding where the operator							work. When the arc voltage reaches approximately 30
would like to control the current level by changing the arc							Volts the arc will go out and the machine will reset the
length. The output CONTROL dial adjusts the full output							current to the Touch Start level. To reinitiate the arc,
range for pipe welding. The ARC CONTROL dial sets the							retouch the tungsten to the work and lift. Alternatively,
short circuit current (arc-force) during stick welding to							the weld can be stopped by releasing the Amptrol or arc
adjust for a soft or more forceful digging arc (crisp).							start switch.
Increasing the number from -10(soft) to +10(crisp)
increases the short circuit current which results in a more							The RANGER® 305 D can be used in a wide variety of
forceful digging arc.Typically a forceful digging arc is pre-							DC TIG welding applications. In general the ‘Touch Start’
ferred for root and hot passes. A softer arc is preferred for							feature allows contamination free starting without the use
fill and cap passes where weld puddle control and deposi-							of a Hi-frequency unit. If desired, the K930-2 TIG Module
tion (“stacking” of iron) are key to fast travel speeds. This							can be used with the RANGER® 305 D. The settings are
can also increase spatter.							for reference.
					TAbLE b.2
		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.

RANGER® 305D