Production Process of Spiral Welded Pipe - Forming Angle

The forming angle refers to the acute angle where the horizontal projection of the centerline of the steel pipe intersects with the centerline of the steel strip, commonly denoted as α. The forming angle is the most critical parameter in the forming process of spiral submerged arc welded pipes. It not only indicates the angle at which the centerline of the steel pipe should be inclined relative to the centerline of the steel strip but also determines the position of the unit on the rolling line. It is essential for the proper matching between the diameter of the steel pipe and the width of the steel strip. Spiral forming can only be achieved when the forming angle is less than 90°. Spiral forming is the result of the functional relationship among B, D, and α.