I would like to ask the working principle of inverter welding machine.

1, working principle of inverter welding machine: inverter welding machine is mainly an inverter arc welding power supply generated by inverter, also known as arc welding inverter, which is a new welding power supply. Power frequency (50Hz) alternating current is first rectified and filtered by rectifier to become DC, then it is inverted into intermediate frequency alternating current of several kHz to several tens of khz by high-power switching electronic components (thyristor SCR, transistor GTR, field effect transistor MOSFET or IGBT), and at the same time, it is reduced to tens of volts suitable for welding by transformer, rectified again, and a fairly stable DC welding current is output by reactance filtering.

2. The transformation sequence can be simply expressed as: power frequency alternating current (rectifier and filter) → DC (inverter) → intermediate frequency alternating current (step-down rectifier and filter) → DC. Namely: AC→DC→AC→DC. The active power in the welding circuit will be greatly reduced because of the high AC frequency and large inductance after the inverter is stepped down. So it needs to be rectified again. This is the mechanism of inverter welding machine widely used at present.

3. Its main features are as follows: 1. Small size, light weight, material saving, easy to carry and move. 2. High efficiency and energy saving, the efficiency can reach 80%~90%, which is more than 1/3 of that of the traditional welder. 3. Good dynamic characteristics, easy arc initiation, stable arc, beautiful weld formation and small splash. 4. It is suitable to combine with robots to form an automatic welding production system. 5. One machine can be used for multiple purposes to complete various welding and cutting processes.

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