Gas/Dig Controls (Preflow/Post Flow/Dig/Purge) - Miller DYNASTY 350 Owner's Manual

5-12. Gas/DIG Controls (Preflow/Post Flow/DIG/Purge)

4
3
2
1
1 Gas/DIG Controls
Press switch pad until desired function
LED is illuminated.
2 Encoder Control (Set Value)
3 Ammeter (Displays Value)
See Section 5-15 for all Adjust parameter
ranges.
4 Voltmeter
Displays word abbreviations of selected
parameters.
PREFLOW [PRE] - If the TIG HF process
is active (see Section 5-7) and Preflow is
shown on the control panel, use control to
set length of time gas flows before arc ini-
tiation.
Application: Preflow is used to purge
the weld area and aids in arc starts.
POST FLOW [POST] - If the TIG process
is active (see Section 5-7), use control to
set length of time gas flows after welding
stops.
AUTO POST FLOW - Creates a post
flow time scaled at 1 second per 10 amps
of the peak weld amperage for a given
weld cycle. Auto post flow is limited to a
8 second minimum, or to the maximum
preset post flow time.
Application:
Postflow is required to cool tungsten and
weld, and to prevent contamination of
tungsten and weld. Increase postflow
time if tungsten or weld are dark in ap-
pearance.
DIG - If Stick process is active (see Sec-
tion 5-7), use control to set amount of
DIG. When set at 0, short-circuit amper-
age at low arc voltage is the same as nor-
mal welding amperage.
When setting is increased, short-circuit
amperage at low arc voltage increases.
Application:
Control helps arc starting or making verti-
cal or overhead welds by increasing am-
perage at low arc voltage, and reduces
electrode sticking while welding.
PURGE [PURG] - To activate the gas
valve and start the purge function, push
and hold the Gas/DIG switch pad for the
desired amount of time. To set from 1 to
50 seconds of purge time, hold the Gas/
DIG switch pad while turning the encoder
control. Default is 0.
While Purge is active, [PURG] is shown
in the left display, and purge time is
shown in the right display.
Pressing any switch pad will end the
purge display, but gas will continue to flow
until the preset time has timed out.
Application: Purge is used to clear the
gas lines.
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