26. How is the production of spiral welded pipe different?

Spiral welded pipes are steel plates or strips that are pre-bent and continuously bent on a forming machine to form a tube with spiral seams. Spiral welded pipe has the characteristics of long weld seam and fast production speed, and is suitable for the production of large-diameter welded pipe.
There are various types of spiral welded pipes according to different classification standards, mainly including:
(1) Classification according to the forming angle adjustment method:
Front swing, back swing.
(2) Classification according to the feeding method of the forming machine:
Roll-up (less used, only on special occasions)
Scroll down (more commonly used)
(3) Classification according to the forming method of the forming machine:
Roll down roller molding machine
Sliding friction full sleeve forming machine
Roller combination forming machine
Rolling friction full roll sleeve forming machine
PRD Forming Machine (invented by PRD Company in the United States, which can continuously adjust the pipe diameter)