METHOD OF MANUFACTURE OF TUBULAR ADAPTER OF ZIRCONIUM ALLOY STEEL Russian patent published in 1997 - IPC

FIELD: nuclear engineering; reactor coolant circulating systems; adapters made of zirconium alloys and steel for use as bimetallic inserts at welding of zirconium alloy channels with steel pipelines. SUBSTANCE: method comes to assembling of blanks, diffusion welding in vacuum and machining of welded joint. After machining, inner and outer surfaces of zirconium portion of adapter are subjected to surface deformation to depth not less than 200 μm and then are subjected to thermal treatment in vacuum for 15 h minimum at temperature of 535 - 565 C. Surface deformation is carried out by multiple pass treatment with roller or ball. During the process relative deformation of surface layer of metal not less than 40 % is provided. EFFECT: improved quality of joints. 6 cl, 2 dwg