-
Ⅳ
-
§2.2 Working Principle
The working principle of HSW SERIES arc welding machine is shown as the following figure. Single-phase
110V/220V work frequency AC is rectified into DC, then is converted to medium frequency AC by inverter
device (IGBT), after reducing voltage by medium transformer (the main transformer) and rectifying by medium
frequency rectifier (fast recovery diodes), and is outputted by inductance filtering. The circuit adopts current
feedback control technology to insure current output stably when MMA or TIG. And adopts voltage feedback
control technology to insure voltage output stably when MIG. Meanwhile, the welding current parameter can
be adjusted continuously and infinitely to meet with the requirements of welding craft.
Rectifier
Inverter
Transformer
Rectifier
Hall
Current
Feedback
control
Single-phase AC
DC
AC
DC
220V 50Hz
AC
DC
Welding current
regulate
(Wire feed speed)
Wire feeder
motor
PWM signal
CPU control
Voltage
Feedback
control
§2.3 Volt-Ampere Characteristic
HSW SERIES welding machine has an excellent volt-ampere characteristic, whose graph is shown as
the following figure. The relation between the rated loading voltage U
2
and welding current I
2
is as follows:
U
2
=14+0.05I
2
(V)
44
14
0
600
I
o
（
A
）
U
o
（
V
）
Working point
Volt-ampere characteristic
The relation between the rated loading
voltage and welding current
Single-phase
110V 50/60Hz
Single-phase
220V 50/60Hz
Current sensor
