Patent DE-102009041383-A1 (DE)
Title: Method for connecting open hollow bodies such as tubes through electron beam welding for the production of towers or pipings, comprises forming an airtight chamber through mounting sealing element and through hollow body walls
Inventor: RUCHAY WILFRIED
IPC: H01J37/315
Filed: 2009-09-12
Abstract: The method for connecting open hollow bodies such as tubes through electron beam welding for the production of towers or pipings, comprises forming an airtight chamber through mounting a sealing element (7) and through hollow body walls, evacuating the chamber and welding a lateral side of the chamber through circumference round seams (5) under vacuum with electron beam canon, where two hollow bodies are connected with the openings under formation of a small push joint, when the width of the push joint is minimized through mechanical pre-treatment on a same measure. The method for connecting open hollow bodies such as tubes through electron beam welding for the production of towers or pipings, comprises forming an airtight chamber through mounting a sealing element (7) and through hollow body walls, evacuating the chamber and welding a lateral side of the chamber through circumference round seams (5) under vacuum with electron beam canon, where two hollow bodies are connected with the openings under formation of a small push joint, when the width of the push joint is minimized through mechanical pre-treatment on a same measure. The push joint is connected between both hollow bodies by a cover seam welded at external circumference. A sealing disc (8) is pushed through accessible opening for internal free cross-section of the first hollow body and the electron beam canon is guided with a rotoric drive unit in the second hollow body or both hollow bodies are pushed up to the plain of the push joint. The remaining openings are closed with the sealing element or both hollow bodies are mounted to each other and the air is sucked for producing a vacuum from the hollow body. The push joint is welded from interior through the circumference round seam by the electron beam canon. The sealing element and the electron beam canon are removed with the rotoric drive unit from the welded hollow body. A next hollow body is joined under formation of a small push joint with the welded hollow body and the process is continued to reach a desired length or height of the hollow body. The electron beam canon is placed with the drive unit on the sealing element in the production of the steel tube and on a base. The welded tube connection (1, 2) is pushed through lifting means and is placed below to the tube connection so that the steel tube drum is connected vertically to a base (9) in final completion. The tube connection is mounted on the installation site of the steel tube drum through connection units from plates and rollers. The longitudinal column is welded towards external by a cover seam in air-tight manner. The complete welding is carried out with the electron beam canon during the welding of the circumference round seam under vacuum. The tube connection is welded during the production of steel tube drum for wind power plant, above the gondola holder. The gondola is mounted and fixed. After welding of steel tube connections and reaching the height, the rotor is mounted on the gondola. The tube connection is mounted and welded for reaching the end height. A corrosion protection layer is applied to the circumference round seam of the tube connection after welding the hollow body and/or the tube connection on the external wall, in which the lower end remains in the area of the circumference round seam. The corrosion protective metal such as aluminum is evaporated after each welding or lateral welding in the vacuum chamber in the tubular drum by the electron beam canon so that a metal layer is implemented as corrosion protection of single micrometer thickness at the interior wall. The first tube is locked during the production of pipelines from tube connection and/or tubes. The electron beam canon is pushed with the rotoric drive unit after positioning both tube connection to be connected and the lateral tube connection to be welded up to push joint. The accessible opening is connected with a sealing element and a vacuum is produced in tubular composite. The push joint is welded from interior with the electron beam canon. After welding of the sealing element, the electron beam canon is removed from the tube with the rotoric drive unit in order to reduce the length of a tube connection. The tube connection is joined together with the opening with the welded tube connection in order to reach the length. An independent claim is included for an arrangement for connecting open hollow bodies such as tubes through electron beam welding for the production of towers or pipings.