Lincoln Electric IM609 SQUARE WAVE TIG 275 - Manual (Page 24)

B-7 OPERATION B-7
6. Trimmer Potentiometers - Allows the meters to
be calibrated in the field.
7. Digital Ammeter - The ammeter displays actual
welding current during a weld cycle and displays
the peak current for approximately 5 seconds after
welding is complete. Otherwise the machine’s set
current is displayed. Read the complete Operating
Instructions section for more information on the
Ammeter.
8. Digital Voltmeter - This meter displays welding
voltage, as measured on the output studs of the
Square Wave TIG 275. After welding is complete,
the meter displays the welding voltage correspond-
ing to the peak welding current and displays this
value for approximately 5 seconds
9. Thermal Protection Light - A yellow light which
only lights when an over temperature situation
occurs.
See the Maintenance Section for more
information on thermostatic protection.
10. Power Switch - Turns power “ON” or
“OFF” to the welder. When switched “ON” the
digital meters will illuminate, indicating that the
power is on.
11. Polarity Switch - Selects DC+, + AC
or DC- - welding polarity without reconnecting
leads. DO NOT SWITCH WHILE WELDING.
12. Twist Mate Electrode and
13. Work Connections - Easy to connect elec-
trode and work connections. This style Electrode
Connection makes the gas and current connec-
tions for the TIG torch at the same time. (Adapter
plugs are provided with the machine.)
14. Remote Receptacle - For Amptrol, Arc Start
Switch or Robotic Interface connection.
15. Optional Water Solenoid Connections -
Easy to install this optional feature which allows
for water flow control for water cooled torches.
WELDING OPERATION
TIG WELDING
Familiarize yourself with the Controls and Settings
Section before attempting operation of the Square
Wave TIG 275.
TIG WELDING GUIDELINES
TIG welding can be done in either the TIG 2-Step
or the TIG 4-Step Weld Mode. TIG 2-Step is typ-
ically used with Hand or Foot Amptrols, with Remote
Current control. TIG 4-Step typically uses an Arc Start
switch and Local Current Control, because it provides
a very brief current upslope, and a .5 to 10 second
adjustable current downslope. TIG 4-Step also func-
tions like a trigger interlock, making it unnecessary to
hold down the Arc Start switch during a weld. If remote
current control is desired in this mode, a device which
provides separate arc start and current control must be
used. Read the TIG Welding Sequence of Operation
sections for more details on 2-Step and 4-Step opera-
tion.
Recommended tungsten electrode sizes, stickouts,
currents, cup or nozzle sizes are shown in Table B.1.
SINCE WELDING APPLICATIONS CAN VARY, THIS
CHART IS INTENDED AS A GUIDE ONLY.
SQUARE WAVE TIG 275