EXPLOSION WELDING PROCEDURE FOR PRODUCTION OF CYLINDER COMPOSITE ITEMS WITH INTERNAL CAVITIES Russian patent published in 2011 - IPC B23K20/08 B23K101/04 

FIELD: metallurgy.

SUBSTANCE: central cavity forming element removed after explosion welding is made of brittle material, particularly, glass, crushed at explosion. There is chosen ratio between thickness of its wall and thickness of walls adjacent to walls of cavity forming elements. A tubular casing is made of corrosion resistant-metal with reduced heat conductivity, for example, of titanium. A tubular intermediate layer of metal of reduced heat conductivity, for example austenite steel, is inserted between the tubular casing and a pipe bundle. Upon explosion welding between titanium and steel there is formed a heat protecting layer of reduced heat conductivity by thermal treatment.

EFFECT: production of all-welded item with internal cavities with maintained axial symmetry and pressure tightness and reduced thermal resistance of metal layers; reduced heat exchange of substances present in internal channels of item with environment and high resistance to corrosive medium.

4 cl, 3 dwg, 1 tbl, 4 ex