1, the welding current of intermediate frequency welder is close to complete DC. Because there is no obvious peak current, the nugget size expands steadily, there is almost no splash, the welding quality is stable and the thermal efficiency is high. Compared with power frequency welding machine, the welding current of intermediate frequency inverter welding machine can be reduced by 40%, and the service life of electrode is greatly prolonged.

2. The transformer of intermediate frequency welding machine has small weight and volume, low input power, and it is convenient to use the electrode holder connected with the transformer. When it is used in robot spot welding, it can reduce the load of the robot, while when it is used in automatic production line, it needs a robot with stronger load capacity.

3. The response speed of intermediate frequency spot welder is only 1/20 of that of power frequency welder, so the current can reach the set value faster, the parameter analysis is more accurate, and the welding quality control is more accurate.

4. Three-phase load balance of intermediate frequency spot welding machine, high power factor (about 0.9), energy saving. However, it is difficult for two-phase power frequency welding machine to ensure the balance between phase voltages and the power factor is low (about 0.6), while it is difficult for three-phase power frequency welding machine to achieve constant current output.

5. Intermediate frequency spot welding machine is suitable for welding various materials and dissimilar metals, such as aluminum alloy, stainless steel, high-strength steel plate and other materials. In addition, the welding quality of galvanized sheet and common multilayer sheet is much higher than that of power frequency welding machine. Power frequency welder is only suitable for materials with good welding performance, such as low carbon steel plate.