Fronius TransTig 2200 Instructions De Service page 149

Tacking function Depending on what tAC time has been set, the pulsed welding current may continue up
(continued)
to, and including, the final current phase I
After the tAC time has elapsed, welding continues at constant welding amperage, and
any pulsing parameters that may have been set continue to be available.
Important! In order to set a defined tacking time, the parameter tAC can be combined
with the parameter SPt (spot-welding time, Set-up menu: Level 1).
TIG cold-wire Important! TIG cold-wire welding is only possible in conjunction with a cold-wire feeder.
welding
The diagram below illustrates TIG cold-wire welding in cases where a pulsing frequency
has been set and the DC welding process has been selected.
For details of how to adjust the parameters referred to here, see: "The set-up menu:
Level 1" - sub-section "TIG set-up parameters".
I
Fig.23 TIG cold-wire welding - chronology of the welding-current and wirefeed-speed curves
Legend:
-
-
-
-
-
-
-
I
1
I
S
Wirefeed
speed
I ........... Starting current
S
I ........... Final (i.e. "end") current
E
t ......... Upslope
Up
t ...... Downslope
Down
F-P ....... Pulsing frequency
(1/F-P = time interval between 2 pulses)
dt1 ........ Time by which the start of wirefeeding is delayed after the beginning of
the main-current phase I
dt2 ........ The time by which the end of wirefeeding is delayed after the end of the
main-current phase I
(if tAC is set to "ON").
E
1/F-P dcY
t
up
dt1
- dcY ....... Duty cycle
- I-G ........ Background current
- I ........... Main current
1
- Fd.1 ...... Wirefeed speed 1
- Fd.2 ...... Wirefeed speed 2
1
1
41
I
E
t
t
down
dt2
t