Pressure vessels top cover actuating device lower omega welding seam ultrasonic inspection method and device

Abstract

The invention relates to an ultrasonic inspection method which refers to the specific ultrasonic inspection method for an Omega weld line beneath a driving mechanism of a reactor pressure vessel. In the method, the Omega weld lines is scanned with a ultrasonic probe, signals are collected through a digital ultrasonic device, then analyzed through a PC machine. During the inspection, four ultrasonic probes are used for scanning the weld lines and all the four probes enter with a refraction angle of transverse waves for 35-degree incidence. The focal point of the focusing probe falls on the axial lead of the Omega weld line that runs vertical to the vocal axis. In addition, a double crystal probe is used in the method to conduct a penetration scan of one deliver and one receive at the bottom and the medium parts of the Omega weld, and a eddy current probe is used for checking defects on the surface of the Omega weld line and the near surface. With the single sided array, the method can conduct overall ultrasonic inspection for the weld line beneath the driving mechanism of the pressure vessel cover for the reactor.

Description

technical field [0001] The invention relates to an ultrasonic inspection method, in particular to an ultrasonic inspection method for the Ω weld of the lower part of the drive mechanism of the top cover of a reactor pressure vessel. Background technique [0002] The structure of the Ω seal weld (referred to as Ω weld) of the reactor pressure vessel drive mechanism is a stainless steel thin-walled tube with an outer diameter of Φ20mm and a wall thickness of 3mm. The materials are 0Cr18Ni9Ti and 1Cr18Ni9Ti. Due to the special structure of the weld, the diameter of the outer circle is small, the wall thickness is very thin, the shape is circular, and there is a driving mechanism in the middle of the weld, which makes the inspection space narrow and makes the conventional ultrasonic inspection impossible. Therefore, at present, only the pressure The Ω weld of the lower part of the drive mechanism of the container top cover is inspected on the surface, but its internal defects ca...

AI Technical Summary

Problems solved by technology

Due to the special structure of the weld, the diameter of the outer circle is small, the wall thickness is very thin, the shape is circular, and there is a driving mechanism in the middle of the weld, which makes the inspection space narrow and makes the conventional ultrasonic inspection impossible. Therefore, at present, only the pressure The Ω weld of the lower part of the drive mechanism of the container top cover is inspected on the surface, and its internal defects cannot be inspected

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