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5�6 TIG DC APC
This process ensures that a constant heat input to the workpiece is maintained. When the arc length is reduced and
therefore weld voltage is reduced, the current is automatically increased. Conversely, if arc length is increased and
weld voltage increases accordingly, the current is automatically decreased. The operator then controls the heat gain
and penetration just by moving the welding torch.
The current variation amplitude per unit of voltage is adjustable by means of the APC parameter.
E.g. if APC adjustment is equal to 20 A/V and during welding the welding voltage increases by 1 V in relation to the TIG
process nominal voltage, then the current decreases by up to 20 A. This variation is automatically reset to 0 when the
voltage is restored to the nominal value.
To activate the welding process, press pushbutton
DC - Fig� 10
on the main screen and then select
DC APC
using
encoder
I�
Select the display pushbutton shown in the figure
and turn encoder
I
to set the desired correction value.
The correction value can be set from the main screen or in the
Process parameter
menu:
Menu -> Process
Parameters -> APC Regulation
APC Regulation
(1 – 80) A/V
5�7 TIG DC XP
TIG DC XP is a welding process where the current pulses at very high frequency and allows a more concentrated and
penetrating weld bath, as well as improved acoustic comfort. Using this process enables higher welding speeds to be
achieved than with the standard TIG DC process. Using this process, it is possible to set all applicable parameters for
the standard TIG DC process, including pulse.
The welding parameters to be set are the same as for the TIG DC process see Tab1.
To activate the welding process, press pushbutton
DC - Fig� 10
on the main screen and then select
DC XP
using
encoder
I
.
The only difference between the TIG DC and TIG DC XP processes is the pulse function.
For TIG DC XP, the maximum frequency that can be set is 300 Hz while for TIG DC it is 2.5 kHz. Refer to Table 1 for
the parameter settings.
