Intermediate frequency inverter DC spot welding machine is a kind of DC resistance welding equipment, which is rectified by three-phase alternating current into pulsating direct current, and then converted into intermediate frequency square wave by inverter circuit composed of power switching devices, and then rectified into less pulsating direct current for electrode welding workpiece. It is one of the most advanced resistance welding methods at present, and its main features are as follows:

1, short power-on time, high thermal efficiency and beautiful welding forming.

Intermediate frequency inverter spot welding machine has a flat output welding current, which ensures the efficient and continuous supply of welding heat. However, the short power-on time reaches ms level, which makes the welding heat affected zone small and the solder joint beautiful.

2, welding spatter can be effectively suppressed, and a stable and high-quality welding effect can be obtained.

The continuous heating generated by the flat output current of the intermediate frequency welder makes the nugget temperature rise continuously, and at the same time, the slope and time of current rise are accurately controlled, so that splashing will not be caused by thermal jump and uncontrollable current rise time.

3. The control precision is high. Because of the high working frequency (generally at 1-4KHz), the feedback control accuracy of intermediate frequency spot welder is 20-80 times that of ordinary AC spot welder and secondary rectifier spot welder, and the corresponding output control accuracy is also very high.

4. The inverter spot welder adopts three-phase input, which is suitable for power supply balance of power grid and does not need power compensation equipment.

5. Save energy. Because of its high thermal efficiency, small welding transformer and small iron loss, inverter welding machine can save energy by more than 30% compared with AC spot welding machine and secondary rectifier spot welding machine when welding the same workpiece.

Intermediate frequency inverter DC spot projection welding machine can be applied to spot welding and multi-point projection welding of ordinary low-carbon steel plates, stainless steel plates, galvanized plates, aluminum plates and wires, and can also be applied to spot welding and nut projection welding of high-strength steel and hot-formed steel in automobile manufacturing industry, as well as resistance brazing and spot welding of copper wires in high and low voltage electrical appliances industry, brazing of silver dots and copper plates, and composite silver dot welding.