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eliminate blowhole and improve the mechanical performance of the joint. 5) High frequency arc is
suitable for high welding speed to improve the productivity.
SWT2033 is suitable for all positions welding for various plates made of stainless steel, carbon steel,
alloyed steel, titanium, magnesium, cuprum, etc, which is also applied to pipe installment, mould
mend, petrochemical, architecture decoration, car repair, bicycle, handicraft and common
manufacture.
MMA - Manual Metal Arc welding
PWM - Pulse-Width Modulation
IGBT - Insulation Gate Bipolar Transistor
TIG - Tungsten Insert Gas welding
2.1. Working principle
The working principle of SWT2033 is shown as the following gure. single phase work frequency AC
110V/220V (50 Hz) is recti ed into DC (about 310V), then is converted to medium frequency AC (about
40KHz) by inverter device (IGBT), after reducing voltage by medium transformer (the main
transformer) and rectifying by medium frequency recti er (fast recovery diode), and is outputted by
inductance ltering. The circuit adopts current feedback control technology to insure current output
stably. Meanwhile, the welding current parameter can be adjusted continuously and steplessly to
meet with the requirements of welding craft.
AC
AC
DC
DC
MEDIUM FREQUENCY
MEDIUM FREQUENCY
HALL DEVICE
INVERTER
TRANSFORMER
RECTIFY
DC
SINGLE PHASE AC
RECTIFY
CURRENT POSITIVE - FEEDBACK
110V/220V - 50HZ
CONTROL
2.2. Volt-Ampere characteristic
SWT2033 welding machine has an excellent volt-ampere characteristic, whose graph is shown as the
following
gure. The relation between the conventional rated loading voltage U2 and the
conventional welding current I2 is as follows:
When I
≤600A, U
=20+0,04 I
(V); When I
>600A, U
=34(V).
2
2
2
2
2
08
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