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