A method for local machining and removal of hyperboloid deep weld defects

By combining a boring and milling composite machine with an electric direct mill, the problem of removing deep hyperboloid weld defects in the reactor coolant system of a nuclear power plant was solved. This method achieved efficient and complete defect removal and repair groove formation, ensuring weld quality and safety.

CN117381328BActive Publication Date: 2026-06-16XIAN NUCLEAR EQUIP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XIAN NUCLEAR EQUIP CO LTD
Filing Date
2023-11-06
Publication Date
2026-06-16

AI Technical Summary

⚠Technical Problem

Existing technologies are insufficient to efficiently remove hyperboloid deep weld defects in nuclear power plant reactor coolant systems, and conventional methods may cause damage to the base material or weld deviation from the original area, affecting equipment safety and quality.

⚗Method used

A combination of boring and milling compound machine and portable electric straight grinder is used. By marking the location of weld defects and drawing the center line of the groove to be repaired, the arc-shaped groove is processed by drilling. The slope of the two sides of the groove is milled, and the layered depth direction is processed and inspected until the defects are removed, forming a groove to be repaired that meets the requirements of repair welding.

🎯Benefits of technology

Successfully removing weld defects improved efficiency, ensuring complete removal of defects in one go, forming a groove structure suitable for repair welding, avoiding damage to the base material and carburization problems, and guaranteeing weld quality.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a kind of hyperboloid depth weld defect local processing removal method, first by weld defect position in the outer surface of workpiece draw out the horizontal and circumferential center line of to-be-welded groove, surface processing boundary reference line, then clamping alignment workpiece, first using row drill method to process arc-shaped groove, then using milling to process the slope of both sides of arc-shaped groove and remove twist drill left sharp corner, and grind the bottom of arc-shaped groove, then using layered processing in depth direction and layered visual inspection to the bottom of arc-shaped groove are carried out to check defect display, until clean, process arc-shaped groove into to-be-welded groove, then process the ladder slope of both ends of to-be-welded groove, finally grind each surface of to-be-welded groove, complete the local processing removal of weld defect, the method can remove the whole weld defect clean, high removal efficiency, while to-be-welded groove structure is simple, and the difficulty of machining is small.
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