Ultrasonic flaw detection apparatus and ultrasonic flaw detection method

The ultrasonic flaw detection device and method address the challenge of inspecting the complex shape of the outside dovetail wing by using a flexible ultrasonic propagation material and a probe with selectively usable piezoelectric elements, ensuring comprehensive defect detection and reduced inspection time.

JP2025037385APending Publication Date: 2025-03-18KK TOSHIBA +1
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Patent Information

Application Number
JP2023144291
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2023-09-06
Publication Date
2025-03-18

AI Technical Summary

Technical Problem

Conventional ultrasonic flaw detection methods struggle to inspect all surfaces of the blade implantation portion of the outside dovetail wing due to its complex shape, leading to incomplete defect detection and increased inspection time.

Method used

An ultrasonic flaw detection device and method that utilize a flexible ultrasonic propagation material to adhere to multiple planes of the blade side surface, combined with a probe equipped with selectively usable piezoelectric elements for transmitting and receiving ultrasonic waves, allowing for comprehensive defect inspection across all surfaces.

Benefits of technology

Enables reliable and efficient detection of defects on all surfaces of the blade implantation portion, reducing inspection time and eliminating the need for frequent probe replacements, thereby minimizing turbine shutdown periods.

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Abstract

To inspect defects reliably in a short time by ultrasonic flaw detection for the entire blade planting part of an outside dovetail blade.SOLUTION: An ultrasonic flaw detection apparatus 20 for inspecting, by ultrasonic flaw detection, a defect K generated in a blade planting part 3 of an outside dovetail blade in a state where the outside dovetail blade 2 is assembled to a rotor wheel 1 of a turbine rotor, comprises: an ultrasonic propagation material 21 which has flexibility and adheres to two or more planes 11A, 11B, 11C forming a blade side surface 11 of the blade planting part 3; and a probe 22 which includes a plurality of piezoelectric elements 24, transmits ultrasonic waves into the blade planting part 3 via the ultrasonic propagation material 21 and receives reflected waves. The plurality of piezoelectric elements 24 are provided in a selectable manner through control in an ultrasonic transmitting side piezoelectric element 24P and a reflected wave receiving side piezoelectric element 24R.SELECTED DRAWING: Figure 2
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