Lincoln Electric IM609-B manual TIG Welding Sequence of Operation Welding in TIG Mode 2-STEP

	B-8					OPERATION									B-8
													(2)
			TABLE B.1 TYPICAL CURRENT RANGES FOR TUNGSTEN ELECTRODES
						AC					Approximate Argon
												Gas Flow Rate
			DCEN ( - )	DCEP ( + )	Unbalanced Wave			Balanced Wave				C.F.H. (1/min.)
Tungsten						1%, 2%			1%, 2%
Electrode			1%, 2%	1%, 2%		Thoriated			Thoriated						TIG Torch
Diameter			Thoriated	Thoriated	Pure	Tungsten		Pure	Tungsten				Stainless		Nozzle
in. (mm)			Tungsten	Tungsten	Tungsten	Zirconiated		Tungsten	Zirconiated		Aluminum		Steel		Size (4), (5)
.010		(.25)	2-15	(3)	2-15	2-15		2-15	---	3-8		(2-4)	3-8	(2-4)	#4, #5, #6
0.020		(.50)	5-20	(3)	5-15	5-20		10-20	5-20	5-10		(3-5)	5-10	(3-5)
0.040		(1.0)	15-80		10-60	15-80		20-30	20-60	5-10		(3-5)	5-10	(3-5)
				(3)
1/16		(1.6)	70-150	10-20	50-100	70-150		30-80	60-120	5-10 (3-5)			9-13 (4-6)		#5, #6
3/32		(2.4)	150-250	15-30	100-160	140-235		60-130	100-180	13-17 (6-8)			11-15 (5-7)		#6, #7, #8
1/8		(3.2)	250-400	25-40	150-210	225-325		100-180	160-250	15-23 (7-11)			11-15 (5-7)
5/32		(4.0)	400-500	40-55	200-275	300-400		100-240	200-320	21-25 (10-12)			13-17 (6-8)		#8, #10
3/16		(4.8)	500-750	55-80	250-350	400-500		190-300	290-390	23-27 (11-13)			18-22 (8-10)
1/4		(6.4)	750-1000	80-125	325-450	500-630		250-400	340-525	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							(4)	TIG torch nozzle “sizes” are in multiples		of 1/16ths of an inch:
pure helium shielding gasses.								#4 = 1/4 in.	(6 mm)
(2) Tungsten electrodes are classified as follows by the American Welding Society (AWS):								#5 = 5/16 in.	(8 mm)
Pure . . . . . . . . . . . . . . . EWP								#6 = 3/8 in.	(10 mm)
1% Thoriated . . . . . . . . EWTh-1								#7 = 7/16 in.	(11 mm)
2% Thoriated . . . . . . . . EWTh-2								#8 = 1/2 in.	(12.5 mm)
Though not yet recognized by the AWS, Ceriated Tungsten is now widely accepted as a substitute for								#10 = 5/8 in.	(16 mm)
2% Thoriated Tungsten in AC and DC applications.						(5)		TIG torch nozzles are typically made from alumina ceramic. Special applications may require lava nozzles,
(3) DCEP is not commonly used in these sizes.								which are less prone to breakage, but cannot withstand high temperatures and high duty cycles.

TIG WELDING SEQUENCE OF OPERATION

WELDING IN TIG MODE (2-STEP)

RELEASE (STEP #2)

PRESET CURRENT

PRESS

(STEP #1)

PREFLOW	POSTFLOW
(0.5 sec FIXED)	(0.5 to 10 sec. ADJUSTABLE
	OPTIONAL
	TIG PULSER

In 2-STEP mode an Arc Start switch or Amptrol must be used. The switch or Amptrol is pressed to start the weld. (Step 1) Output continues until the switch or Amptrol is released. (Step 2)

1.Connect the Twist Mate plug to the receptacle locat- ed on the front of the machine. The connection locks into place with a quarter turn making both the power and gas connections. See the TIG TORCH CON- NECTION section to install the Twist Mate plug on your torch.

2.Connect an Arc Start Switch or an Amptrol to the Remote Amphenol.

3.Turn the welder, gas supply and water supply (if equipped), on. The digital ammeter/voltmeter dis- plays will illuminate when the power is on. NOTE: Cooling fan may not be “ON” when not welding. (See MAINTENANCE Section)

4.Set the MODE switch to “2-STEP TIG”.

5.Set the peak current displayed on the digital amme- ter with the output control knob.

6.Select AC or DC- electrode polarity. See Table B.2.

TABLE B.2

RECOMMENDED POLARITY

SETTINGS FOR TIG WELDING

	Electrode
Type of Welding	Polarity
Stainless Steel	DC-
Aluminum & Magnesium	AC
Other Metals	DC-

7.If welding with AC polarity, set the AC Wave Balance Knob to Auto Balance™. This gives the optimum ratio between cleaning and penetration, automatically adjusted for the output current. If manual adjustment of the AC Wave Balance is desired, adjust the wave balance to the desired set- tings. See the Advanced Features section for more information on setting and using the AC Wave Balance.

SQUARE WAVE TIG 275