SUMMARY
11
PWM——Pulse-Width Modulation;
IGBT——Insulation Gate Bipolar Transistor
TIG——Tungsten Insert Gas welding
2.2 Module Explanation
The module explanation of arc welding machine must accord with the correlative prescripts of
National Standard GB10249. It is explained as the following (take ARCOTIG HF 315 AC/DC as an
example).
MAGIC AC TIG-250W
MAX CURRENT 250A
AC/DC
Soft-switching technology
Multiple Waveform Control
TIG
2.3 Working Principle
The working principle of ArcoTig 250W/315W AC/DC welding machines is shown as the following
figure. 3-phase 380V work frequency AC is rectified into DC (about 530V)
，
3-phase 220V work
frequency AC is rectified into DC (about 310V), then is converted to medium frequency AC (about 20K
Hz) 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 stability. Meanwhile, the welding current parameter can be adjusted continuously and
steplessly to meet with the requirements of the welder.
Note: Please refer to the nameplate about the right power supply connection (three phase 220v or
three phase 380v). Incorrect power connection may cause machine failure!
