Lincoln Electric IM609-B manual Welding in TIG Mode 4-STEP

B-9 OPERATION B-9

8.Set the Post Flow Time with the post flow knob. Post flow control knob adjusts the time that the shielding gas flows (and cooling water flow, if the optional water solenoid is used) after the weld cycle. Use short post flow times with low currents and small tungstens, use long post flow times at high output currents with large tungstens.

9.With the torch held safely away from everything, press the Arc Start Switch or Amptrol and set the gas flow meter. Release the switch or Amptrol. The welder is now ready for welding.

10.Position the tungsten electrode at the start of the weld at a 65˚ to 75˚ angle with the horizontal so that the electrode is approximately 1/8" (4 mm) above the work piece. Press the Arc Start Switch. This opens the gas (and optional water solenoid) valves to automatically purge air from the hose and torch. After a 0.5 second preflow time, the high frequency becomes available to strike the arc.

11.Hold the Arc Start Switch or Amptrol down until an arc is established. If using an Amptrol, read the Section on Hand and Foot Amptrol Operation. Release the Arc Start Switch or Amptrol to stop the arc and start the Post Flow timer. After the Post Flow time has expired, the gas and (optional water solenoid) valves will close. To make anoth- er weld, repeat steps 10 and 11.

WELDING IN TIG MODE (4-STEP)

PRESS #2 (STEP #3)

PRESET CURRENT

	RELEASE #1
PRESS #1	(STEP #2)	RELEASE #2
(STEP #1)		(STEP #4)

START	CRATER CURRENT
CURRENT	DOWNSLOPE
	(0.5 to 10 sec. ADJUSTABLE
PREFLOW	POSTFLOW
(0.5 sec. FIXED)	(5 to 50 sec. ADJUSTABLE)
	OPTIONAL
	TIG PULSER

In 4-STEP mode an Arc Start switch must be used. The switch is pressed and then released to start the weld cycle. Pressing and releasing the switch a sec- ond time ends the weld cycle. This eliminates the need to continuously hold down the switch during the weld. The process works as follows:

(STEP #1) First Press: Initiates a 0.5 second preflow of shielding gas then starts the weld at a current equal to 5 Amps or 25% +/- 10 % of preset current (whichev- er is greater).

(STEP #2) First Release: The output current ramps up to the preset level in 0.5 seconds.

(STEP #3) Second Press: The output current ramps down to 5 Amps or 25% +/- 10 % of the preset current (whichever is greater). The time it takes to ramp down can be adjusted from approximately 0.5 to 10 seconds with the Down Slope Time control knob.

(STEP #4) Second Release: Output is turned off stop- ping the weld and starting the 5 to 50 seconds post flow set with the Post Flow control knob.

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 CONNECTION section to install the Twist Mate plug on your torch.

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

3.Turn the welder, gas supply and water supply (if so equipped), on. The digital ammeter/voltmeter dis- play 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 “4-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.

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.

8.Set the Post Flow time with the Post Flow knob. Post Flow time provides shielding gas flow (and cooling water, if used) after the weld. Use short Post Flow times with low currents and small tung- stens and long Post flow times at high output cur- rents and large tungstens.

9.Set the Downslope Time with the Downslope Time Knob. This will adjust the time of the crater fill peri- od.

SQUARE WAVE TIG 275