Comparison test block for creeping wave fault detection

Abstract

The invention discloses a comparison test block for creeping wave fault detection, wherein the comparison test block has a column structure, in addition, one end of the comparison block is provided with at least one detection surface (10), the first detection surface (10) is a part of the cylindrical surface and is outwards projected, the bus line direction of the first detection surface (10) is the same as the length direction of the comparison test block, in addition, first detection grooves (11) are arranged in the first detection surface (10) and are grooves with the same depth, and in addition, the first detection grooves (11) extend in the circumference direction of the first detection surface (10). The first detection surface of the comparison test block can simulate the surface of an object to be tested, after a creeping wave probe is pasted with the first detection surface of the comparison test block, the first detection grooves arranged in the first detection surface can be used for determining the sensitivity during the creeping wave detection, and in addition, the reflection equivalent weight during the creeping wave fault detection can be determined.

Description

technical field [0001] The invention relates to the field of nondestructive testing, in particular to a comparison test block for creeping wave flaw detection. Background technique [0002] High-temperature fastening bolts are important parts of thermal power equipment in thermal power plants. In long-term operation, due to the effect of high temperature and high stress, the bolt material is prone to thermal embrittlement, creep, fatigue, and stress corrosion; due to excessive pre-tightening force and inadvertent burning of the center hole during installation, the bolt material is prone to cracks . In order to ensure the safe operation of equipment, it is very important to strengthen the effective inspection of high-temperature fastening bolts. [0003] At present, small-angle longitudinal wave detection methods, shear wave detection methods and creeping wave detection methods are often used to test whether cracks appear inside high-temperature fastening bolts. [0004] C...

AI Technical Summary

Problems solved by technology

Since the creeping wave propagates, most of its energy is mainly concentrated in a certain range under the surface, and unlike the surface wave, it is not sensitive to the surface roughness of the workpiece, so the creeping wave flaw detection method can detect cracks under the rough surface , but there is no effective method to determine the sensitivity of creeping wave flaw detection, and there is no effective method to determine the equivalent of flaw reflection

Images