65
EN
Ignition time out, TIG pulsing and tacking function
Ignition timeout
function
The power source has an ignition timeout function.
Once the torch trigger is pressed, gas pre-flow begins immediately. Ignition then begins. If
an arc does not appear within the time specified in the Setup menu, the power source cuts
out automatically.
The settings for the parameter Ignition timeout are described in the section "The HF menu"
from page 96 onwards.
TIG pulsing The welding current set at the start of welding is not always ideal for the welding process
as a whole:
- if the amperage is too low, the base material will not melt sufficiently
- if overheating occurs, the liquid weld pool may drip.
The TIG pulsing function (TIG welding with pulsing welding current) offers a remedy:
a low base current (2) rises steeply to the significantly higher pulse current and, depending
on the set duty cycle (5), drops back to the base current (2).
In TIG pulsing, small sections of the welding location melt quickly and then solidify again
quickly.
In manual applications using TIG pulsing, the welding wire is applied in the maximum cur-
rent phase (only possible in the low frequency range: 0.25 - 5 Hz). Higher pulse frequen-
cies are mainly used in automatic mode to stabilise the arc.
TIG pulsing is used for out-of-position welding of steel pipes or when welding thin sheets.
Mode of operation of TIG pulsing when TIG DC welding is selected:
TIG pulsing - welding current curve
Legend:
(1) Main current, (2) Base current, (3) Starting current, (4) UpSlope, (5) Pulse frequency *)
(6) Duty cycle, (7) DownSlope, (8) Final current
*) (1/F-P = time interval between two pulses)
(1)
I [A]
t [s]
(2)
(3)
(4)
(5)
(6)
(7)
(8)
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