A brazing method for pipe seat under space curved surface structure of fuel assembly

Abstract

The invention belongs to the technical field of fuel assembly welding, and in particular relates to a method for brazing a pipe seat under a space curved surface structure of a fuel assembly. Including the brazing of the lower pipe seat of the space curved surface structure, it needs to be brazed twice, namely the brazing of the lower pipe seat assembly and the brazing of the lower pipe seat parts; the lower pipe seat structure, upper ribs, lower ribs, blades The parts assembled and brazed are called the lower pipe seat assembly, and the parts assembled and brazed by the lower pipe seat, the guide pipe seat, and the instrument pipe seat are called the lower pipe seat parts; the whole process of the brazing method of the lower pipe seat includes step 1 1. Assembly and spot welding of the lower pipe seat assembly, step 2, coating of the lower pipe seat assembly; step 3, brazing of the lower pipe seat assembly; step 4, assembly spot welding of the lower pipe seat parts; step 5, coating of the lower pipe seat parts ; Step 6, brazing of the lower pipe seat parts; solve the problem of local flow channel blockage after pipe seat brazing, unbrazed, not filled defects.

Description

technical field [0001] The invention belongs to the technical field of fuel assembly welding, and in particular relates to a method for brazing a pipe seat under a space curved surface structure of a fuel assembly. Background technique [0002] At present, the lower tube socket of nuclear fuel assembly mostly adopts the split structure form combining the anti-foreign matter plate and the structural parts (such as figure 1 As shown), the lower pipe seat of the "Hualong One" fuel assembly adopts a creative space surface structure (such as figure 2 shown), use brazing technology to manufacture an integrated design with flow channel and filter function, and use the geometry of the flow channel itself to filter foreign matter, thereby reducing fuel damage caused by foreign matter abrasion. [0003] The French AREVA Group has been researching the overall brazing of the lower nozzle of the fuel assembly, but according to public reports, it has not entered the practical stage, and...

AI Technical Summary

Problems solved by technology

[0011] The object of the present invention is to aim at the above defects existing in the prior art, to provide a method for brazing the pipe seat under the space curved surface structure of the fuel assembly, which solves the problems of local flow channel blockage, unbrazed and incompletely filled defects after the pipe seat is brazed. Happening

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