Gtaw Operation - Thermal Arc ULTRA FLEX 350 Owner's Manual

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OPERATION
Electrode
Diameter
Inches
.020
.040
1/16
3/32
1/8
5/32
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)
GTA W mode is intended to be used for
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
CC/CV Pulse unit through the SAFE. If an optional
arc starter is to be used, be sure to make all con-
5-4
Welding Current, Amps
DCEN
Using pure or thoriated tungsten electrodes
5-35
30-100
70-150
150-225
200-275
250-350
Table 5-1 Typical Current Ranges for
Tungsten Electrodes
®
350
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.
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.
7. Make sure gas flow has been initiated.
DCEP
———
———
10-20
15-30
25-40
40-55
February 28, 2000