SWEISS
WELD.COM
info@sweissweld.com
SUMMARY
8
MMA——Manual Metal Arc welding;
PWM——Pulse-Width Modulation;
IGBT——Insulation Gate Bipolar Transistor
TIG——Tungsten Insert Gas welding
§2.3 Working Principle
The working principle of SKYTIG 2045 ACDC welding machines is shown as the following figure.
Single-phase 220V work frequency AC is rectified into DC (about 312V), then is converted to medium
frequency AC (about 20KHz) by inverter device (IGBT module), after reducing voltage by medium
transformer (the main transformer) and rectifying by medium frequency rectifier (fast recovery diodes),
then is outputted DC or AC by selecting IGBT module. The circuit adopts current feedback control
technology to insure current output stably. Meanwhile, the welding current parameter can be
adjusted continuously and steplessly to meet with the requirements of welding craft.
Rectif
ier
Invert
er
Trans
forme
r
Rectif
ier
Hall
devic
e
Current feedback
control
Single-phase, AC
DC
AC
DC
220V 50Hz
AC
Invert
er
AC or DC
Control signal
AC or DC
PFC
DC
§2.4 Volt-Ampere Characteristic
SKYTIG 2045 ACDC welding machine has an excellent volt-ampere characteristic, whose graph
is shown as the following figure. The relation between the conventional rated loading voltage U
2
and
