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Vacuum chamber complex weld automatic non-destructive testing technology project two projects have passed the acceptance
[ China Instrument Network Instrument Development ] On December 25th, the "CFETR vacuum chamber automatic flaw detection system" and the "vacuum chamber austenitic stainless steel phased array detection process development" project undertaken by the Plasma Research Center successfully passed the mechanical industry. An expert group composed of a design institute, Hefei Research Institute and Hefei General Machinery Research Institute accepted the inspection.
"CFETR vacuum chamber automatic flaw detection system" and "vacuum chamber austenitic stainless steel phased array detection process development" is the Ministry of Science and Technology of the Ministry of Science and Technology 2015 National Magnetic Constrained Nuclear Fusion Energy Development Research Project "vacuum chamber complex weld automation Non-destructive testing technology" content.
Among them, "CFETR vacuum chamber automatic flaw detection system" is to solve the problem that the CFETR vacuum chamber is assembled and recycled when the two D-shaped girth welds on the inner shell are X-rayed by the compensation ring. The problem. The difficulty of the subject lies in the narrow space between the double-shells in the vacuum chamber, the non-magnetic properties of the austenitic stainless steel itself and the positioning accuracy requirements. In more than a year, the project team designed a variety of programs, produced a variety of versions of the car, and obtained the best structural design of friction and gravity balance based on multiple rounds of experiments. The final manufactured car was in CFETR vacuum. The simulated body passed the tests of crawling, positioning, cloth, and obstacles. At present, a number of patents such as "CFETR vacuum chamber pre-test piece horizontal weld automatic flaw detection positioning device and flaw detection method" have entered the stage of actual trial.
The "vacuum chamber austenitic stainless steel phased array inspection process development" project is an automated ultrasonic inspection process specification for the development of various types of welded joints in the vacuum chamber manufacturing process. One of the difficulties of the subject is the ultrasonic attenuation and scattering caused by the coarse columnar crystal of the austenitic stainless steel weld. In addition, as an emerging ultrasonic detection technology, the phased array detection standard is not perfect. Through theoretical calculation and ultrasonic simulation technology, the research group developed an automatic phased array detection technology based on advanced DMA probes, which realized the recordable and locable detection results. The signal-to-noise ratio of the core process indicators exceeded the standard requirements.
(Original title: Vacuum chamber complex weld automatic non-destructive testing technology project two projects passed the acceptance)