Average Value Pulse Welding - EWM T4.07 Operating Instructions Manual

As an example the process is shown with HF ignition. Arc ignition with lift arc is also possible, how-
ever > see 5.1.3 chapter.
Selecting the process activation type for the welding process > see 5.6 chapter.
Up-slope and down-slope times possible for long spot time setting range (0.01–20.0 s) only.
 Press and release torch trigger (tap) to activate the welding process.
 Touch the torch gas nozzle and tungsten electrode tip carefully against the workpiece.
 Incline the welding torch over the torch gas nozzle until there is a gap of approx. 2–3 mm between the
electrode tip and the workpiece. Shielding gas flows during the set gas pre-flow time
tes and the previously set ignition current
 The main current phase
 For long-time spot welding only (parameter
The welding current decreases to the end-crater current
 The gas post-flow time
Press and release the torch trigger (tap) to reactivate the welding process (only for separate
process activation). Touching the welding torch with the tungsten electrode tip against the
workpiece again will initiate the next welding processes.
5.1.4.6

Average value pulse welding

Once the pulse function is activated, the red signal lights for the main current AMP and secondary current
AMP% light up at the same time. Average value pulsing means that the system switches between two
currents periodically, an average current value (AMP), a pulse current (Ipuls), a balance (
quency ( ) having been defined first. The predefined ampere current average value is decisive, the
pulse current (Ipuls) is defined by the
The pulse pause current (IPP) is not set; the machine control calculates the value instead to ensure that
the average value of the welding current (AMP) is maintained. For average value pulsing, the
is the secondary current only, activated with the torch trigger.
AMP = main current (average value), e.g. 100 A
Ipuls = pulse current =
IPP = pulse pause current
Tpuls = duration of one pulse cycle = 1/
= balance
Selection
099-00T407-EW501
14.07.2020
flows.
ends when the set
=
elapses and the welding process ends.
parameter as a percentage of the average current value (AMP).
Figure 5-12
x AMP, e.g. 140% x 100 A = 140 A
, e.g. 1/100 Hz = 10 ms
Figure 5-13
Functional characteristics
spot time elapses.
):
within the set down-slope time
TIG welding
. The arc igni-
.
) and a fre-
current
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