Why is amorphous iron core widely used in domestic high-power welding machines?
At present, a large proportion of domestic high-power welding machines use amorphous iron cores, while most foreign countries also use ferrite cores. Using the most inverter frequency of 20kHz, amorphous iron core should be said to have more material cost advantage than ferrite, but due to the characteristics of the material, currently amorphous iron core can only be supplied in a ring form, which is not convenient for coils. Automatic winding. Most foreign companies use ferrite cores and are unwilling to switch to amorphous iron cores, while domestic companies widely use amorphous iron cores out of consideration for material costs. The soft-switching power supply technology in foreign inverter welding machines is not very common, especially most of the 20kHz inverter welding machines are still dominated by hard switching, but the capacity margin of the switching devices used is much larger than that of domestic welding machines, so as to ensure High reliability of the inverter power supply. This is due to different labor costs, because of the manufacturing and assembly costs of additional electromagnetic components required for soft-switching circuits, and the amorphous iron core will exceed the material cost of increasing the capacity of the switching device where labor costs are high. In foreign soft switching power supply technology, amorphous iron core is mainly aimed at high-frequency and high-power welding machines operating at 60-120 kHz, mainly to improve the response speed of the power supply and facilitate more precise waveform control process.