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SWA2850 series is widely used in Petroleum, chemical, mechanical, shipbuilding, architecture, boiler,
pressure container, military industry and Maintenance work , etc. This machine has high duty cycle
even in the 40°C, which can keep the continuous operation. The frame is Stability of the machine,
which can keep working under high temperature and corrosion environment.
MMA——Manual Metal Arc welding;
PWM——Pulse-Width Modulation;
IGBT——Insulation Gate Bipolar Transistor;
TIG——Tungsten Inert Gas welding.
2.1. Working principle
The working principle of ARC series of welding machines is shown as the following
Single-phase 110V-460V line frequency (50/60 Hz) AC is recti ed into DC, Three-phase 220V-460V line
frequency (50/60 Hz) AC is recti ed into DC, then by PFC circuit, DC is converted to medium frequency
AC (about 50KHz) by inverter device (IGBT module), after reducing voltage by medium transformer
(the main transformer) and recti ed by medium frequency recti er (fast recovery diodes), and is
outputted by inductance ltering. 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 welding craft.
PFC
DC
TRIFÁSICO AC
MONOFÁSICO AC
RECTIFY
AC 220V / 380V
2.2. Volt-Ampere characteristic
SWA2850 series has excellent volt-ampere characteristic. Referring to the following graph. In MMA
welding, the relation between the rated loading voltage U2 and welding current I2 is as follows:
When I
≤600A, U
=20+0,04 I
2
2
AC
MEDIUM FREQUENCY
INVERTER
TRANSFORMER
(V); When I
>600A, U
2
2
08
SWEISSWELD.COM
AC
MEDIUM FREQUENCY
RECTIFY
CURRENT POSITIVE - FEEDBACK
CONTROL
=44(V).
2
gure.
DC
DC
HALL DEVICE
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