先进核电堆型热交换器关键焊接技术OA

To break through the core manufacturing bottleneck of integrated design and commercialization of advanced nuclear power plant heat exchangers in China,this research focuses on the newly designed heat exchanger with independent intellectual property rights,systematically analyzes its innovative structure,material selection and process requirements,and focuses on solving the technical problems of high-reliability welding.In response to the high-temperature sodium environ-ment and complex structural characteristics,through the innovative development of manufacturing equipment,the develop-ment of anti-sodium corrosion welding joint processes,and the detection technology of the welding process,five core weld-ing technologies have been successfully developed:the slot-type tube/tube sheet sealing weld welding process,the labyrinth seal wear-resistant layer surfacing welding process,the control measures for the geometric accuracy and dimensional defor-mation of the tube sheet-sleeve assembly and welding,the all-position butt welding process for small-diameter thin-walled tubes,and the low-deformation and high-efficiency stainless steel welding process for large multi-layer thin-walled austen-itic stainless steel.A full-process welding quality control system has been formed.The research results fill the gap in the field of precision welding of nuclear-grade heat exchangers in China,establish independent process specifications and manu-facturing standards,provide core technical support for the standardized design and engineering application of similar equip-ment,and effectively promote the implementation of the national major equipment independentization strategy.