MANUFACTURING METHOD OF WELDED THIN-WALL CONICAL SHELL WITH LONGITUDINAL CORRUGATIONS Russian patent published in 2015 - IPC B23K31/02 B23K37/02 B23K15/04 B21D51/12 

FIELD: metallurgy.

SUBSTANCE: shell segments with longitudinal corrugations and bent edges are formed. Segments are arranged on a base with lodgements for corrugations and pre-fixed on the base. After that, a stiff crimp-on frame is arranged on the base coaxially to it above the segments. Then, final fixation of segments and electron-beam welding of longitudinal joints of segments is performed in a vacuum chamber along bent edges with their further local heat treatment. Welding of joints and their heat treatment is performed first in one joint along the whole perimeter of the shell, and then, subsequently for the rest joints. Welding is performed in a pulse mode with certain parameters. Local heat treatment of a weld is performed by heating the weld with a scanned electron beam. After welding and heat treatment of all joints is completed, the finished shell is cooled, unfastened and removed from the base.

EFFECT: invention allows simplifying a manufacturing process of thin-wall shells, enlarging technological capabilities by obtaining corrugated conical shells and providing high accuracy of parameters of the obtained welded structure.

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