Average Value Pulse Welding; Metallurgical Pulsing (Khz Pulsing) - EWM T 4.02 - AC/DC Comfort 2.0 Operating Instructions Manual

Functional characteristics
TIG welding
4.1.9

Average value pulse welding

A special feature with average value pulses is that the power source will always maintain the preset
average value. This makes this method especially suitable for welding according to welding procedure
specifications.
The parameter
variant. Once the function is activated, the red signal lights for the main current AMP and secondary
current AMP% light up at the same time.
Average value pulse welding means that the system switches between two currents periodically, an
average current value (AMP), a pulse current (Ipuls), a balance (
defined first. The predefined ampere current average value is decisive, the pulse current (Ipuls) is defined
by the parameter as a percentage of the average current value (AMP).
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
4.1.9.1

Metallurgical pulsing (kHz pulsing)

Metallurgical pulsing (kHz pulsing) uses the plasma force (arc force) occurring at high currents which
allows you to achieve a constricted arc with concentrated heat input. Unlike thermal pulsing, no times are
set; a frequency
slope and down-slope phase.
30
must be switched to
x AMP, e.g. 140% x 100 A = 140 A
, e.g. 1/100 Hz = 10 ms
and the balance are set instead. The pulsing process also occurs during the up-
in the machine configuration menu to enable this pulse
) and a frequency (
Figure 4-25
Figure 4-26
) having been
current
099-00T402-EW501
24.04.2018