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B-4
OPERATION
B-4
6. Digital Display - displays currently set values for
each mode or welding parameter.
7. Local/Remote push button - Selects the welding
current adjusting system:
• from front panel
• from remote control
The LED beside the symbol confirms the selection.
8. Tig Trigger Sequences - For the V205-T AC/DC,
TIG welding can be done in either the 2-step or 4-
step mode which is selected with the Trigger Mode
Push Button.
2-Step Sequence
With the Trigger Mode switch in the 2-step position,
the following welding sequence will occur. This
sequence is shown in (2-step diagram 1)
1. Press and hold the Arc Start Switch to start the
sequence.
The machine will open the gas valve to start the flow
of the shielding gas. After a 0.5 second preflow time,
to purge air from the torch hose, the output of the
machine is turned ON. At this time the arc is started.
After the arc is started the output current will be
increased from the start current to the welding cur-
rent. Both the start current and increase, or upslope
time are presettable. The default start current is 15
amps and the default upslope time is 0.2 seconds.
2. Release the Arc Start Switch to stop welding.
The machine will now decrease the output current at
a controlled rate, or downslope time, until the Finish
current, (also commonly referred to as Crater
Current) is reached and the output of the machine is
turned OFF. Both the Downslope Time and the
Finish Current are can be preset.
After the arc is turned OFF, the gas valve will
remain open to continue the flow of the shielding
gas to the hot electrode and work piece. The dura-
tion of this postflow shielding gas is adjusted by the
Postflow Parameter.
Possible variations of this standard sequence is
shown in (2 step diagram 2). It is possible to press
and hold the TIG torch trigger a second time during
downslope to restart. After the trigger is pressed the
output current will increase to the welding current.
This operation is shown in (2 step diagram 2).
4-Step Sequence
With the 4-step Selected, the following welding
sequence will occur.
1. Press and hold the Arc Start Switch to start the
sequence.
The machine will open the gas valve to start the flow
of the shielding gas. After a 0.5 second preflow time,
to purge air from the torch hose, the output of the
machine is turned ON. At this time the arc is started.
After the arc is started the output current will be at
the Start current. This condition can be maintained
as long or as short as necessary.
If the Start current is not necessary, do not hold the
TIG torch trigger as described at the beginning of
this step. Instead, quickly press and release the trig-
ger. In this condition, the machine will automatically
pass from Step 1 to Step 2 when the arc is started.
2. Release the TIG torch trigger to start the main part
of the weld.
The output current will be increased from the start
current to the welding current. Both the start current
and increase, or upslope time are presettable. The
default start current is 15 amps and the default ups-
lope time is 0.2 seconds.
3. Press and hold the TIG torch trigger when the main
part of the weld is complete.
The machine will now decrease the output current
at a controlled rate, or downslope time, until the
Finish current is reached. Both the Downslope Time
and the Finish Current are presettable. This Finish
current can be maintained as long or as short as
necessary.
V205-T DC & V205-T AC/DC TIG
2 STEP DIAGRAM 1
2 STEP DIAGRAM 2
(1)
(2)
(2)
(2)
(1)