HTP Invertig 200, Owner'S Manual

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8. I2 buttons
The I2 buttons control the Final Current. This is only
applicable when your Invertig 200 is set in the 4T welding
mode. The final current is adjustable from 1% to 99% of the
base current that is set by the amperage adjustment knob (#5).
For example, if the amperage adjustment knob is set to 100
amps, and the final current is set to 15%, the final current will
be 15 amps.
This is achieved by the following: with the welding mode in the
4T position, depressing the torch trigger starts the pre-gas flow.
The pre-gas cycle will continue until the trigger is released, at
which time the arc will ignite. The unit will weld at the base
current that is set by the amperage adjustment knob (#5).
Depressing the torch trigger again will reduce the current to the
final current value. The slope down time (T2) determines the
amount of time in which the current goes from the base current
to the final current. The machine will continue to weld at the
final current until the trigger is released. Once the trigger is
released, the post gas cycle will start.
9. Post Gas Flow
The post gas flow is adjustable from 2 sec to 20 sec in 0.2 sec
increments. Post gas flow is necessary because after the arc is
extinguished; if the gas stopped flowing immediately, there is a
possibility the molten weld puddle would come in contact with
the atmosphere, causing weld defects. Additionally it prevents
the tungsten from becoming contaminated by the atmosphere.
The gas flow should run long enough to allow the orange color
of the tungsten to disappear. It is important to remember not to
remove the TIG torch from the weld until the post gas cycle has
been completed. A good starting point for the post gas flow is
5.0 sec. If you are welding at higher amperages or on more
critical alloys it may be necessary to increase the post gas flow
to a higher value.
10. Local/Remote switch
When in the Local position, the amperage will be adjusted by
the amperage adjustment knob (#5) on the front of the welder.
The amperage adjustment knob can also be used to limit the
maximum output of your Invertig 200.
When in the remote position, the amperage is infinitely
adjustable by either the foot pedal or the torch mounted
amperage control. To limit the maximum amperage of the
machine to 100 amps, with the foot pedal plugged in, flip the
local/remote switch to the local position. Using the amperage
adjustment knob (#5) adjust the amperage to 100 amps. Flip
the local/remote switch to the remote position. The digital
display panel should read 5 amps. Now, when you fully
depress the foot pedal, the amperage displayed should be 100
amps. This makes the foot pedal less sensitive and makes it
easier to control your puddle.
11. Pulse Mode
By depressing the Pulse Mode button, the green light will
illuminate indicating your Invertig 200 is in the pulse mode. At
this time the display will show the pulsing frequency. To turn
off the pulse mode, depress button 11 for at least 3 seconds until
the green pulse light goes off.
To adjust the pulsing frequency, depress the Pulse Mode button
(#11) until the frequency is displayed in the digital display panel
(#4). Now use the T2 button to adjust the pulse frequency from
0.4 to 2.0 Hz in the AC mode, and from 0.4 to 300 Hz in the
DC mode.
The pulsing base current is fixed at 25% of the maximum
current and the pulsing duty cycle is fixed at 50%.
12. AC Welding Mode
Depressing the AC welding mode button will illuminate the
green light indicating your Invertig 200 is in the AC welding
mode. When the AC Welding Mode button is depressed and
released, the digital display will indicate the AC Welding
Frequency and the AC Welding Balance.
To turn the AC Welding Mode off, depress the AC Welding
Mode button for at least 3 seconds until the green AC welding
mode light goes out.
13. AC Frequency Knob
The AC frequency knob adjusts the length of the AC square
wave. It can be adjusted from 20 Hz to 200 Hz without any loss
in welding output. Conventional transformer machines have
their AC frequency fixed at 60 Hz. It is beneficial to run the
machine at the higher frequencies (150 to 100hz) for the
following reasons:
A) Produces a more focused arc that results in a narrower bead.
B) Heat is more concentrated, minimizing the heat
affected zone.
C) Allows you to weld aluminum with a 2% thoriated tungsten
or 2% cerriated tungsten sharpened to a point. Arc is much
more stable and is less likely to wander.
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