Welding method of inner rib plates in lower reactor core shell base in high temperature gas cooled reactor

Abstract

The invention discloses a welding method of inner rib plates in a lower reactor core shell base in a high temperature gas cooled reactor, which can control maximum deformation of a baseplate to be not higher than 9.6 mm. After an inner cylinder, an outer cylinder and the baseplate are welded, and 15 inner rib plates are uniformly distributed between the inner cylinder and the outer cylinder, parts needing to be welded are preheated to above 205 DEG C; after the preheating is finished, the positioning welding is performed for the outer cylinder and the inner rib plates, and the inner cylinder and the inner rib plates; then, the multi-layer and multi-way welding method is adopted to weld the inner rib plates and the outer cylinder; and finally, the inner rib plates and the baseplate are welded. The welding method has the following advantages: the method can control the maximum deformation of the baseplate to be not higher than 9.6 mm, is firm in welding, satisfies the welding quality requirements on the nuclear power aspect, and prolongs the service life of the base.

Description

technical field [0001] The invention relates to a welding method for an inner rib plate in a base of a lower core shell in a high-temperature gas-cooled reactor. Background technique [0002] With the introduction of the "fourth generation advanced nuclear energy system" concept, high temperature gas-cooled reactors are gradually characterized by their unique safety, wide range of uses, miniaturization, low investment, and short construction period following the introduction of the concept of modular high temperature reactors. And other characteristics have won the favor of more and more people of insight. [0003] The high-temperature gas-cooled reactor is an advanced reactor with the safety characteristics of the fourth-generation nuclear energy system. It is one of the six alternative reactor types in the fourth-generation nuclear energy system in the international nuclear energy field, and it is the only one that can achieve commercial operation before 2020. Generation ...

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Problems solved by technology

[0009] The material of the base workpiece is 12Cr2MolR. Due to the high content of Cr and Mo in the material, there is a greater tendency to harden during welding, and the welding is very difficult.

The maximum deformation of the bottom plate should be controlled at ≤9.6mm, that is to say, within the processing allowance. The current conventional welding method cannot guarantee that the maximum deformation of the bottom plate is controlled at ≤9.6mm

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