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The power supply device is also called the power circuit, which is usually composed of resistance welding transformer, power adjustment mechanism, (stage number converter), main power switch, welding circuit, etc., but it is used in capacitor energy storage welding machine, DC shock wave welding machine and three-phase welding machine. The main circuit of the low-frequency welding machine also includes a primary rectifier device and a polarity switch, etc., an inverter welding machine also includes a primary rectifier device, an inverter and a secondary rectifier component, etc., and a secondary rectifier welding machine also includes two Sub-rectifier components, etc.

1. It can output high current, low voltage, and the output welding current is usually 1-100KA. The output no-load voltage of the fixed welding machine is usually within 12V, and the mobile welding machine is within 24V.

2. The main power source (resistance welding transformer) is generally used without no-load and the load duration is low. The first standard stipulates that the rated load duration of the resistance welding transformer is 50%, which is the design basis. However, from the perspective of welding productivity characteristics, Concave and butt welders are mostly 20%, while seam welders can be 50%-100%.

3. A variety of welding current waveforms can be provided. Because the current waveform delivered to the welding area is closely related to the thermal physical properties and use requirements of the weldment material itself, it is a guarantee condition for obtaining high-quality welded joints and therefore has an impact on the resistance welding process. Therefore, resistance welding machines can be divided into: power frequency AC resistance welding machines, secondary rectification resistance welding machines, DC shock wave resistance welding machines, three-phase low frequency resistance welding machines, and inverter resistance welding machines. Machine, and capacitor energy storage resistance welding machine.