APPLICATION OF AUTOMATIC ORBITAL WELDING IN MANUFACTURE OF HOUSINGS OF NEUTRON MEASUREMENT CHANNELS OF NUCLEAR REACTORS

摘要

Up to present time neutron measurement channels were mainly delivered in Ukraine from abroad. Therefore, problem of improvement of operating characteristics and mastering of domestic production of such channels is highly relevant. Application of automatic non-consumable electrode orbital welding was considered for obtaining of welded joints of elements of housings neutron measurement channel of being one of the most important elements of the system of in-pipe measurements of nuclear power units. Results of working through of technology of automatic GTA welding and optimum modes of performance of these joints using domestic modernized automatic machines for orbital welding ADTs 627 U3.1 and ADTs 625 U3.1 as well as technical characteristics of indicated automatic machines are given. Procedure of assembly for GTA welding of structural elements of housings of neutron measuring channels was described. Results of nondestructive testing, mechanical testing, metallographic investigations and tests to intercrystalline corrosion resistance of welded joints are submitted. It is shown that application of developed technologies and equipment allows mastering the domestic production of neutron measurement channels.