Thermal arc 201 ts operation – Tweco 201 ts Thermal Arc User 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

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)

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

Zero ohm (minimum) connection to 5k

ohm remote control potentiometer

Wiper arm connection to 5k ohm remote

control potentiometer

NOTE

Remote Welding Current Control is not available on

this model.