Tweco 201 ts Thermal Arc - Manual (Page 28)

THERMAL ARC 201 TS OPERATION
Operation 4-2 Manual 0-5149
C. TRIGGER Mode Switch (LIFT TIG Mode Only)
2T (Normal) Mode
Press the TIG Torch Trigger Switch or Foot Control and
hold depressed to weld. Release the TIG Torch Trigger
Switch or Foot Control to stop welding. Down Slope
operates in LIFT TIG (GTAW) mode only. While welding
if the TIG Torch Trigger Switch is released, the weld-
ing current ramps down to zero current over a defined
period of time. The time period is determined by the
Down Slope Control Knob (F).
4T (Latch) Mode
This mode of welding is mainly used for long weld runs.
The operator need only to press the TIG Torch Trigger
Switch to activate and then release the TIG Torch Trigger
Switch to continue to weld, then press the TIG Torch
Trigger Switch again and release the TIG Torch Trigger
Switch to stop welding. This eliminates the need for the
operator to depress the TIG Torch Trigger Switch for the
complete length of the weld. The 4T mode incorporates
a current slope function which includes a fixed current
up slope of 1 second and an adjustable current down
slope. Current slope operates in TIG Mode only. Up slope
is not adjustable and activates automatically in 4T mode
when the TIG torch trigger is depressed. To activate
the Down Slope function in 4T mode while welding,
the TIG Torch Trigger Switch must be depressed and
held while welding which will ramp the Welding Current
down to zero over a defined period of time. The time
period is determined by the Down Slope Control Knob
(F). At any time while welding if the TIG Torch Trigger
Switch is depressed and released the arc will extinguish
immediately.
D. Process Selection Switch
Switches between STICK (MMA), LIFT TIG (GTAW) and
HF TIG (GTAW) modes. Refer to Section 3.06 Setup
for STICK (MMA) Welding and 3.07 Setup for TIG / HF
TIG Welding.
E. Welding Current Control
The welding current is increased by turning the Weld
Current Control Knob clockwise or decreased by turning
the Weld Current Control Knob counterclockwise. The
welding current should be set according to the specific
application. Refer to application notes in this section
for further information.
F. Arc Force/Down Slope Control
Arc Force is effective when in STICK (MMA) Mode only.
Arc Force control provides an adjustable amount of Arc
Force (or “dig”) control. This feature can be particularly
beneficial in providing the operator the ability to com-
pensate for variability in joint fit-up in certain situations
with particular electrodes. In general increasing the Arc
Force control toward ‘10’ (maximum Arc Force) allows
greater penetration control to be achieved. Down Slope
operates in TIG mode only. It is used to set the time for
weld current to ramp down. Refer to Item C (Trigger
Mode Selection Switch) for further information regard-
ing Downslope operation.
G. Gas Outlet
The Gas Outlet is a 5/8”-18 UNF female gas fitting and
is utilized for the connection of a suitable TIG Torch.
H. Post Gas Flow (weld current dependant)
Post Gas Flow is the time Gas flows after the arc has
extinguished. The gas flow time is proportional to weld
current. This is used to cool and reduce oxidization of
the Tungsten Electrode. For example if the Welding Cur-
rent is set to 10 amps the Post Gas Flow time will be
approximately 3 seconds. For a Welding Current set to
160 Amps the Post Gas Flow time will be approximately
10 seconds. The Post Gas Flow time cannot be adjusted
independently of the Welding Current.
I. 8 Pin Remote Socket
The 8 pin remote socket is used to connect the TIG
Torch Trigger Switch to the welding Power Source. To
make connections, align keyway, insert plug, and rotate
threaded collar fully clockwise.
Art # A-09815_AB
1 2 3 4 5 6 7 8
5k Ohms
2 1
5 4 3
8 7 6
Front View of 8 Pin Socket
Plug Pin Function
1
2
Torch Switch Input (24V) to energize
weld current. (connect pin 2&3 to turn on
welding current)
3 Torch Switch Input (0V) to energize weld
current. (connect pin 2&3 to turn on
welding current)
4
5
5k ohm (maximum) connection to 5k ohm
remote control potentiometer
6 Zero ohm (minimum) connection to 5k
ohm remote control potentiometer
7 Wiper arm connection to 5k ohm remote
control potentiometer
8
NOTE
Remote Welding Current Control is not available on
this model.