ERW call is one of the resistance welding steel pipe, ERW are respectively corresponding to the first letter of the English word. Resistance welding steel pipe can be divided into ac and dc welding welding two forms.
Ac welding according to the different frequency is divided into low frequency, intermediate frequency brazing, intermediate frequency and high frequency welding welding. High frequency welding is mainly used for thin wall pipe or ordinary wall thickness pipe production, high frequency welding is divided into contact welding and induction welding.
Dc welding is commonly used in small diameter steel pipe.
So, in general, the high frequency welded pipe contained in ERW welded pipe, is a kind of high frequency welding process production ERW welded pipe.
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