Lincoln Electric SQUARE WAVE SVM141-A Page 23 Service Manual Download

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TIG WELDING SEQUENCE OF OPERATION
(2-Step TIG Mode)

1. Connect an Arc Start Switch or an Amptrol to the

Remote Amphenol.

2. Turn the welder, gas supply and water supply (if

equipped), on. The digital ammeter/voltmeter dis-
plays will illuminate when the power is on.

3. Select the 2-Step TIG Mode with the 2-Step/4-Step

TIG/Stick switch.

4. Set the maximum output current using the output

control knob.

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

6. 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 of the AC Wave Balance is
desired, adjust the wave balance to the desired
settings. See the Advanced Features section for
more information on setting and using the AC
Wave Balance.

7. 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.

8. Press and release the Arc Start Switch, and set the

gas flow meter. The welder is now ready for weld-
ing.

9. 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 fre-
quency becomes available to strike the arc.

10. 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 another weld,
repeats steps 9 and 10.

TIG WELDING SEQUENCE OF OPERATION
(4-Step TIG Mode)

1. Connect an Arc Start Switch to the Remote

Amphenol.

2. 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.

3. Select the 4-Step TIG Mode with the 2-Step/4-Step

TIG/Stick switch.

4. Set the maximum output current using the output

control knob.

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

6. 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
settings. See the Advanced Features section for
more information on setting and using the AC
Wave Balance.

7. 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.

8. Set the Downslope Time with the Downslope Time

Knob. This will adjust the time of the crater fill peri-
od.

9. Press and release the Arc Start Switch, to set the

gas flow meter if necessary. 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 water valves to automati-
cally purge air from the hose and torch. After a 0.5
second preflow time, the high frequency becomes
available to strike the arc.

OPERATION

B-7

SQUARE WAVE TIG 275

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