OM-2240 Page 30
5-12. AC Waveshape (Dynasty Models Only)
1
AC Waveshape
2
Encoder Control
3
Ammeter
Turn encoder (see Section 5-2) to
set appropriate value for active AC
Waveshape parameter. Value se-
lected is shown on the ammeter
(see Section 5-4).
See Section 5-16 for all AC Wave-
shape parameter ranges.
Balance:
AC Balance Control is
enabled only if AC TIG process is
selected. Use control to set per-
centage of time polarity is electrode
negative.
Application:
When welding on oxide forming ma-
terials such as aluminum or magne-
sium, excess cleaning is not neces-
sary. To produce a good weld, only
a minimal amount, approximately a
0.10 in (2.5mm) of etched zone
along the weld toes is required.
Joint configuration, set-up, process
variables, and oxide thickness may
affect setting.
AC Frequency:
AC Frequency
Control is enabled only if AC TIG
process is selected. Use control to
set AC frequency (cycles per sec-
ond).
Application:
AC frequency controls bead width
and directional control. As AC fre-
quency decreases, weld bead/
puddle gets wider. As AC frequency
increases, weld bead/puddle be-
comes narrower and the arc be-
comes more focused. Travel speed
can increase as AC frequency in-
creases.
1
2
3
5-13. Spot Time Control (Reconfigured RMT 2T HOLD Output Selection)
Or
SPO
1.0
1
3
1
Spot Time Meter Display
Select Spot function according to
Amperage Switch Pad
3
Encoder Control
Set spot parameters as follows:
Press Amperage switch pad once
(meter A LED turns on) and turn En-
coder to set spot amperage. Press
Amperage switch pad again, (meter
S LED lights) and turn Encoder to
set spot time (.1
−
25 seconds). Fac-
tory default setting is 1 second.
Application:
To provide a timed
weld. Used for tacking, and thin
sheet joining.
2
Or
Or
