Effect Frequency for the ERW Tube production line

    The frequency of high-frequency welding have a great impact on the welding, because high frequency currents affect the internal distribution of steel. Selection of high and low frequency welding impact is mainly the size of the weld heat affected zone. From the welding efficiency, it should be possible to use higher frequencies. 100KHz frequency current can penetrate ferritic steel 0.1mm, 400KHz can only penetrate 0.04mm, that is, the current density distribution of the steel surface, which is nearly 2.5 times higher than the former. In the production practice, carbon steel welding material is generally selected frequency of 350KHz ~ 450KHz; alloy welding materials, welding more than 10mm thick steel plate, can be used as 50KHz ~ 150KHz low frequency, as contained in the alloy skin effect and chrome steel, zinc, copper, aluminum and other elements there are some differences. After the high-frequency foreign equipment manufacturers are now mostly used the new technology of solid-state high-frequency, it is set in a frequency range, automatic tracking during welding adjust the frequency depending on the material thickness, line speed and so on.

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