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NOTE: When using a remote control such
as foot pedal, momentarily switch the front
panel back to LOCAL control to view the
preset maximum amperage on the display.
When ready to weld, switch back to RE-
MOTE by pressing the REMOTE button on
the front panel.

8. To strike an arc, first energize the power source

by depressing the foot pedal, or using the torch
switch, or by using the CONTACTOR button on the
front panel.

9. Make sure gas flow has been initiated.

10. Gently rest the cup of the torch on the work-

piece.

11. Rock the torch until the tungsten briefly con-

tacts the work; this will initiate the “LIFT-ARC” fea-
ture of the power source. Lift or rock the tungsten
back off of the work to initiate the welding arc. During
the time the tungsten is touching the work, the
power source will automatically limit the output cur-
rent to 20 amps. As the arc is initiated, the current
will automatically change to the preset value. To
minimize the heating of the end of the tungsten, it
should be left in contact with the work only briefly.

12. To end the weld, release the foot pedal, or turn

contactor switch off. Turn off shielding gas supply.

GTAW Operation

(Non-Lift)

G TA W m ode is intended to be us ed fo r

non-contact arc starting such as with the use of an
optional capacitor discharge arc starter. GTAW
mode can also be used for scratch start TIG. This
mode can be made active on the Ultra Flex

350

CC/CV Pulse unit through the SAFE. If an optional
arc starter is to be used, be sure to make all con-

nections to the arc starter with the power off. The
arc starter will connect to the 19 pin amphenol
receptacle on the rear of the power source. The foot
pedal or remote control will then connect to the arc
starter. If an optional pulser control is also used, it
will need to be connected to the arc starter, and then
the foot pedal connected to the pulser control.

1. Figure 5-3 shows typical connections for an

Optional Arc Starter Box.

2. Provide suitable shielding gas connections and

controls to the torch or Arc Starter Box. The power
source does not provide connections for the shield-
ing gas.

3. Select the proper tungsten size and type for the

job. Table 5-1 gives a basic guideline to the amper-
age ranges of various tungstens.

4. Turn AC power switch to the ON position. The

initial power up sequence will be complete in ap-
proximately three seconds.

5. Press the GTAW button on the control panel.

This will select the TIG process.

6. To set welding amps, use the UP and DOWN

buttons. For local control, the display will show the
preset welding amperage. For remote control, the
display will show the preset maximum amperage.
The foot pedal or hand control will have control from
0 to this maximum setting.

7. Make sure gas flow has been initiated.

Electrode

Diameter

Inches

Welding Current, Amps

DCEN

DCEP

Using pure or thoriated tungsten electrodes

.020

5-35

———

.040