Mehrfachgewickeltes Metallrohr sowie Verfahren und Vorrichtung zu dessen Herstellung

摘要

Walls of the multi-wound tubular body 12 are pressure welded with each other and then cooled, while at least the outer circumference of a brazing material between the walls of the multi-wound tubular body is kept at a flowable temperature by heating, by using at least one of a step of pressing substantially uniformly the outer circumferential surface of the tubular body in a radial direction from the outside, a step of substantially uniformly pressing the inner circumferential surface of the tubular body in the radial direction from the inside or a step of exerting a tensile force to the tubular body in the direction of the tubular axis. The tube so formed has no voids in the brazing material and a smooth outer surface.