Composite manufacturing technique for isothermal forward and reverse combined extrusion and vacuum diffusion welding of blanket first wall

Abstract

The invention discloses a composite manufacturing technique for isothermal forward and reverse combined extrusion and vacuum diffusion welding of a blanket first wall. The technique is characterized in that preformed U-shaped parts are firstly formed by slabs with rectangular initial cross sections through bending; U-shaped parts, which are provided with openings in two ends and H-shaped cross sections, are then formed through forward and reverse combined extrusion of the isothermal precise plastic forming technique, and serve as first components; U-shaped parts, which are provided with one-way openings and U-shaped cross sections, are then formed through one-way extrusion of the isothermal precise plastic forming technique, and serve as second components; pairwise butt welding of the first components is finally carried out through vacuum diffusion welding in such a manner that the openings of every two butt welded first components are opposite to each other; packaging welding of the second components and the first components at the two ends is carried out in such a manner that the openings of the second components are opposite to the openings of the corresponding first components, so as to form the blanket first wall. The blanket first wall formed through the technique achieves high shape and dimension precisions, uniform wall thicknesses, distortion-free runner sections, and good runner and weld microstructure performances; the material utilization rate and the production efficiency are high, and the technique is stable.

Description

technical field [0001] The invention relates to a compound manufacturing process of isothermal positive and negative compound extrusion and vacuum diffusion welding of the first wall of a cladding layer, belonging to the technical field of material processing. Background technique [0002] Fusion reactor cladding is the core of future fusion reactor components, and is a key component for deposition and conversion of neutron energy, as well as tritium breeding and shielding. The first wall is an important part of the cladding module. As a part of the cladding structure that directly faces the high-temperature plasma, it is in the harshest environment and must directly bear the high heat load of 0.5MW / m from the plasma. 2 and strong neutron wall load 0.78MW / m 2 , The wall pipe is fed with helium gas at 300°C and 8MPa, the temperature and pressure are high, and excellent high-temperature mechanical properties are required. Moreover, the structure of the internal flow channel ...

AI Technical Summary

Problems solved by technology

However, the current manufacturing process has defects such as low material utilization rate and production efficiency, poor flow path structure performance, low dimensional accuracy, and unstable process.

Although the hot isostatic pressing diffusion bonding process has been applied in the assembly of the first wall of the test cladding module, the process must be in a sealed environment, and the requirements for the weldment are very high, and the secondary welding of the weld will occur during the welding process. Sub-free deformation, unable to control its forming accuracy

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