A method of repairing a valve seat sealing surface

CN117867497BActive Publication Date: 2026-10-16SUZHOU NUCLEAR POWER RES INST CO LTD
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Patent Information

Application Number
CN202410211151.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-02-27
Publication Date
2026-10-16
Estimated Expiration
2044-02-27

AI Technical Summary

Technical Problem

但是，对于服役的核电中小阀门密封面的修复，由于其已处于精加工尺寸，剩余的机械加工余量非常小，采用常规的弧焊方法进行修复，会导致产生过大的变形，直接导致零件报废

Benefits of technology

[0022] Compared with the prior art, the advantages of this invention due to the adoption of the above technical solution are as follows: The valve seat sealing surface repair method of this invention, by performing local laser cladding repair on the sealing surface, realizes the repair of the valve seat sealing surface of small and medium-sized valves in nuclear power plants. This reduces the repair workload, avoids excessive deformation during the repair process, reduces the pore size generated during the cladding process, reduces welding residual stress, increases the density of the cladding layer, and improves the fatigue resistance of the valve sealing surface; it also facilitates the reuse of scrapped parts and reduces maintenance costs.

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Abstract

The application discloses a kind of repair methods of valve seat sealing surface, comprising the following steps: confirming the number, size and distribution position of the defect of valve seat sealing surface;Remove the defect on the sealing surface, detect and confirm that each defect is removed completely in each defect removal process;The detection method includes visual detection and penetration detection;Groove is opened in the position of each original defect;Each groove is carried out multiple laser cladding to form cladding layer, so that the top surface of each groove forms a repaired surface;The valve seat is tempered and the repaired surface is surface treated;Finally, the sealing surface is detected, and no defect is confirmed, and the repair is completed.The repair method of the application realizes the repair of the valve seat sealing surface of small and medium-sized valve in nuclear power, which not only reduces the repair workload, but also avoids excessive deformation, reduces the welding residual stress, reduces the pore size generated in the cladding process, increases the density of the cladding layer, and improves the fatigue resistance of the valve sealing surface.
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