METHOD FOR JOINTING TUBULAR PARTS OF DIFFERENT MATERIALS, MAINLY FOR GUIDE CHANNELS OF NUCLEAR- REACTOR FUEL ASSEMBLIES Russian patent published in 2003 - IPC

FIELD: assembling pasts, including tubular ones, made of different materials in various industries. SUBSTANCE: proposed method that provides for reliable fixation of stainless steel wire on zirconium pipe, reduced nonuniformity of wire embedding in materials of tubular parts, and elimination of areas with low mechanical and anticorrosion properties includes installation of pre-coiled stainless steel wire 3 on outer surface of zirconium pipe with interference fit on spiral path, Then pipe mounting coiled wire is installed in external stainless steel pipe 1. The latter is rotationally compressed over its outer surface. Amount of interference fit is chosen depending on ratio of inner diameter D_lcw of coiled wire in loose state to inner diameter D_wcw of coiled wire in wound state. This ratio is between 0.73 and 0.84. Diameter d of stainless steel wire is chosen between 0,47•Δ and 0,53•Δ, where Δ - is wall thickness of zirconium pipe. EFFECT: enhanced reliability of joints between tubular parts radioactive environment. 1 cl, 4 dwg