Vacuum chamber complex weld automatic non-destructive testing technology project two projects have passed the acceptance
On December 25th, the Plasma Research Center successfully completed and passed the inspection of two key projects: the "CFETR Vacuum Chamber Automatic Flaw Detection System" and the "Vacuum Chamber Austenitic Stainless Steel Phased Array Detection Process Development." The evaluation was conducted by an expert panel from a design institute, Hefei Research Institute, and Hefei General Machinery Research Institute. These projects were part of the Ministry of Science and Technology's 2015 National Magnetic Constrained Nuclear Fusion Energy Development Research Project titled "Complex Weld Automation Non-Destructive Testing Technology for the Vacuum Chamber."
The "CFETR Vacuum Chamber Automatic Flaw Detection System" was designed to address the challenge of inspecting the two D-shaped girth welds on the inner shell of the CFETR vacuum chamber during assembly and recycling. The main difficulties included the limited space between the double shells, the non-magnetic properties of austenitic stainless steel, and strict positioning requirements. Over the course of more than a year, the project team developed multiple prototypes, tested various configurations, and ultimately achieved an optimal structural design that balances friction and gravity. The final prototype successfully passed tests in simulated environments, including crawling, positioning, cloth navigation, and obstacle avoidance. Several patents, such as the "CFETR Vacuum Chamber Pre-Test Piece Horizontal Weld Automatic Flaw Detection Positioning Device and Flaw Detection Method," are now entering trial phases.
The second project focused on developing an automated ultrasonic inspection process for different types of welded joints in the vacuum chamber manufacturing process. A major challenge was the ultrasonic attenuation and scattering caused by the coarse columnar crystals in austenitic stainless steel welds. Additionally, phased array detection, an emerging technique, lacked standardized procedures. Through theoretical calculations and ultrasonic simulations, the research team developed an advanced automatic phased array detection system using DMA probes. This system enabled accurate and recordable inspection results, with core performance metrics exceeding industry standards.
These two successful projects mark significant progress in the development of automated non-destructive testing technologies for fusion reactor components, contributing to the broader goals of nuclear fusion energy research.
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