Matco Tools M148 - Welding Machine Working Principle; Volt-Ampere Characteristic Explained

OVERVIEW
7
§2.2 Working Principle
The working principle of M-SERIES arc welding machine is shown as the following figure.
single-phase 110 or 220V work frequency AC is rectified into DC（154V）, then is converted to
medium frequency AC (about 37KHz) 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. Meanwhile, the welding current
parameter can be adjusted infinitely to meet with the requirements of welding application.
§2.3 Volt-Ampere Characteristic
The inverter 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