OVERVIEW
§2.4 Duty cycle and Over-heat
The letter “X” stands for Duty Cycle, which
is defined as the portion of the time a welding
machine can weld continuously with it’s rated
output current within a certain time cycle (10
minutes).
The relation between the duty cycle “X” and
the output welding current “I” is shown as the
right figure.
If the welding machine is overheating, the
IGBT over-heat protection sensing will send a
signal to the welding machine control unit to cut the output welding current OFF and light
the over-heat pilot lamp on the front panel. In that case, the machine should not be welding
for 10-15 minutes to cool down with the fanrunning. When operating the machine again, the
welding output current or the duty cycle should be reduced.
§2.5 Working Principle
The working principle of MULTIMIG SYN series welding machine is shown as the following
figure. Single-phase 110V/220V work frequency AC is rectified into DC（530V）, then is
converted to medium frequency AC (about 20KHz) 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.
Relation of welding current and duty cycle
for Multi-GMAW 250 DP PFC
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