SWEISS
WELD.COM
info@sweissweld.com
SUMMARY
6
Wider voltage flexibility
(220V±10%).
TIG——Tungsten Inert Gas welding;
MMA——Manual Metal Arc welding;
PWM——Pulse Width Modulation;
IGBT——Insulated Gate Bipolar Transistor;
§2.2 Working Principle
The working principle of SKYTIG welding machines is shown as the following figure. Single
phase work frequency AC 220V or 230V (50 Hz) is rectified into DC (about 300V), then is
converted to medium frequency AC (about 20KHz) by inverter device (IGBT), after reducing
voltage by medium transformer (the main transformer) and rectifying by medium frequency
rectifier (fast recovery diode), and is outputted by inductance filtering. The circuit adopts
current feedback control technology to insure current output stably. Meanwhile, the welding
current parameter can be adjusted continuously and step less to meet with the requirements of
welding craft.
§2.3 Volt-Ampere Characteristic
TP- series 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 the conventional welding current I
2
is as follows:
When I
2
≤600A U
2
=10+0.04I
2
(V); When I
2
600A,U
2
=34(V).
