There are two different forming methods for high frequency pipe welding machine:

1. First weld, then form. that is, first weld into a round tube, then into a special-shaped tube.Such as rectangular tube, oval, dow tubsteel wine, etc.The advantage of this method is that in the production of several types of steel tubes, when uniform strip sizes are allowed, only a set of rollers is required to weld the round tubes and then different sections are obtained on a fixed diameter frame.
2. First forming, then welding.The pipe with complex section profile cannot be obtained from the deformation of the pipe, so direct moulding and welding are needed.The advantage of direct forming is that the shape of the product is not limited as long as the number of formed frames meets the requirements of deformation passage.Its disadvantage is the large amount of roll processing.