2.3 Characteristic Volt-Ampere
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
Current
2.2 Working Principle
The working principle of MIG 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 v
oltage 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.
MIG series welding machine has an excellent volt-
ampere characteristic, whose graph is shown as
the following figure.
The relation between the rated loading voltage U2
and welding current I2 is as follows:
U2=14+0.05I2(V)
9
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