16
8 Components of the Stud Welding Unit
©Walter Stauffenberg GmbH & Co. KG
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8
Components of the Stud Welding Unit
8.1
Main Assemblies
Mains input
W
elding output
1 - PFC mains input
4 - Medium frequency transformer
2 - Electrolytic capacitors
5 - Rectifier
3 - IGBT switch
6 - Control unit
The mains voltage is rectified by the master switch and the EMV filter in the
PFC
unit (1)
.
The rectified voltage is smoothed by the
electrolytic capacitors (2)
and led to the
IGBT switches (3)
. These switches turn the direct voltage into a high-frequency
alternating voltage of 30 kHz.
The energy is transferred via the
medium frequency transformer (4)
with
diodes (5)
and rectified. The smoothed current is led to the weld bushes.
The
IGBT switch (3)
is controlled in the
control unit (6)
. The control unit also
coordinates the mechanical process (withdrawing of the welding elements) with
the electronic control system (triggering the pre current, triggering the main current,
welding time process). The welding time and welding current are fully adjustable.
The type plate is located on the backside of the stud welding unit.