Abstract: Apparatus for making a continuous tubular structure of helically wound interlocked metal strip. The metal strip is fed to forming rollers, from a reel of the strip and which are mounted on the same side of a circular plate which is rotated about a horizontal axis to wind the strip, which is shaped by the rollers, prior to winding, around a mandrel. A plurality of pressure rollers positioned around the mandrel interlock and compress the profiled strip. The mandrel is driven in a direction opposite to the direction of rotation of the plate. A rotatable support assembly downstream of the mandrel tightens and clamps the windings. A longitudinal extraction mechanism downstream from the support assembly restrains the tubular structure from rotating and feeds the formed structure to a receiving reel.