METHOD AND APPARATUS FOR MANUFACTURING HOLLOW TUBULAR MEMBERS

摘要

There is disclosed a method and apparatus for adjusting the thickness of a hollow tubular member to provide a cross-section of constant area , such adjustment being inversely dependent upon detected increases or decreases in the thickness of the metal strip. The method and apparatus provide for the formation and welding of a metal strip into a hollow tubular member; the application of longitudinally directed, braking or pushing forces to the hollow tubular member; and then the continuous reduction of the hollow tubular member to achieve a cross-section of constant area.