Tig Welding (Hf) - Fimer TT255 AC/DC Manuel D'emploi

7.4 TIG WELDING (Hf)

The HF TIG welding allows you to strike the arc
without tungsten contamination.
By turning switch 10 it is possible to choose from
the different TIG welding modes; press the switch
to select the desired option.
Select TIG procedure
Lift Arc
HF
Select this option and the welding screen will
appear:
Ready to weld
150
>
15,0
2s-4s-4bilevel
2nd level current
mode
AC frequency
AC balance
pre gas time
start current
start time
slope up
slope down
end current
end time
post gas time
pulse mode
background current
pulse frequency
pulse balance
water pump
remote
min current
spot welding
pause
DC trigger current
span
ADJUSTMENTS AND SETTINGS:
Button 9 controls the current and the machine
power.
Button 10 adjusts the welding settings on the
screen:
2s-4s-4bilevel: Used to set the operating mode to
2 times or 4 times.
14
START
BACK
OPTIONS
TIG
START
A
BACK
MEM +
V
OPTIONS
2t
TIG
50%
Hf
DC
50 Hz
35%
0,0s
20%
0,0s
0,0s
0,0s
20%
0,0s
5,0s
OFF
20%
10,0
50%
OFF
OFF
5A
0,0s
0,0s
100%
20ms
2s: In 2t operating mode pressing the button caus-
es the protective gas to be released and resulting
arc with the initial current and/or ramp-up deliv-
ered, which remains on for the entire time the but-
ton is held down.
When the button is released the machine starts
the ramp-down of the current and/or the final
current, if set.
4s: In the 4t operating mode when the button is
pressed for the first time the protective gas is
released, then when the electrode is raised from
the piece the electric arc is struck.
The current delivered corresponds to the initial cur-
rent parameter as long as the button is not
released, then the machine performs the ramp-up
if set. The next time the button is pressed the
machine performs the ramp-down of the current, if
set, and the final current (until the button is
released), and then the post gas phase. If the but-
ton is released immediately the machine performs
the ramp-down of the current (if set) and then the
post gas phase.
4bi: This operation is similar to the 4t mode with
the only difference that pressing the torch button
for short periods (< 1s) during welding (after the ini-
tial ramp) causes the passage of the current from
the first level I1 to the second level I2; holding the
button down (> 1s) causes the start of the end of
the weld (ramp-down and/or final current if set).
2nd level current: If the value 4bi of the 2t-4t-
4bilevel parameter is selected this makes it possi-
ble to set the 2nd level current as a percentage of
the welding current.
Mode: Used to set the welding mode to alterna-
ting current (AC) or direct current (DC).
AC frequency: Used to set the switching fre-
quency of the welding current when alternating
current (AC) is selected.
AC balance: Used to indicate the percentage of
time in which the welding current remains DC+,
when the alternating current (AC) mode is selected.
Pre gas: Used to set the time for delivery of gas
before striking the electric arc.
Initial current: Used to set the value to which the
welding current is raised immediately after the
electric arc has been struck.
Start current: Used to set the time for which the
current determined by the final current parameter is
applied.
In 4t/4bi mode (if the spot weld parameter is equal
to 0) this time has no effect and the initial current is
maintained as long as the torch button is held
down.
Start time: Used to set the duration of the ramp-
up of the welding current.
Slope down: Used to set the duration of the ramp-
down of the welding current.