Відкрите Акціонерне Товариство "Новомосковський Трубний Завод"
Открытое Акционерное Общество "Новомосковский Трубный Завод"
Валерій Борисович Фурманов
Валерий Борисович Фурманов
Юрій Миколайович Антипов
Юрий Николаевич Антипов
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Priority to UA99116151ApriorityCriticalpatent/UA36180A/en
Publication of UA36180ApublicationCriticalpatent/UA36180A/en
Butt Welding And Welding Of Specific Article
(AREA)
Abstract
The invention concerns metallurgy. A method includes gradual decrease of the radii of curvature of cross sections of edges and central section of skelp in the direction of its advance in open and closed forming passes, in the welding pass and pipe in calibration passes from its flat state upstream of the first forming pass to the radius of finished pipe after last calibration pass. In the closed passes and in welding pass simultaneously, with decrease of the radii of curvature of the cross sections of central section, an increase of the radii of curvature of the cross sections of areas of edges is created, while in the calibration passes, simultaneously with decrease of the radii of curvature of the cross sections of areas of edges, an increase of the radii of curvature of the cross sections of central area is created.
UA99116151A1999-11-101999-11-10Method of manufacturing of longitudinal welded tubes
UA36180A
(en)
Method and apparatus for manufacturing pipe having irregular shaped cross section, and pipe having irregular shaped cross section formed by the same method and apparatus