Ultrasonic probe for small-diameter tube rolling defects and supporting test blocks

Abstract

The invention discloses an ultrasonic probe for detecting rolling defects of small-bore pipes. The ultrasonic probe is characterized by adopting a probe shell; the inner chamber of the probe shell is divided into an incidence chamber and an emitting chamber, which are bilaterally symmetric to each other, by a sound insulation layer; wafers are arranged in the probe shell, and are an incidence wafer in the incidence chamber and an emitting wafer in the emitting chamber; the incidence wafer and the emitting wafer are the same in structure and performance parameter, and symmetrically arranged by taking the sound insulation layer as a center, so as to form a one-receive one-send double-wafer probe; ultrasonic detection signals produce straight-through wave echo signals in the pipe wall of a pipe to be detected through the double-wafer probe; the rolling defects of the small-bore pipe can be detected by comparing the ultrasonic detection signals and the straight-through wave echo signals. The ultrasonic probe can be used for quick scanning of pipe racks on a heating surface of a boiler, and is high in detection result accuracy.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing, in particular to an ultrasonic probe for small-diameter tube rolling defects applied on the heating surface of a boiler and a matching test block. Background technique [0002] Rolling defects of boiler heating surface tubes usually include surface scratches, cracks, folds, warped skins, transverse cracks and delamination, etc. The most harmful ones are cracks, delamination and folds, which directly affect the processing performance of the tubes , and threaten the safe performance of the pipe. [0003] Since the ratio T / D of the wall thickness T to the diameter D of the boiler tube is usually less than 0.20, and the tube wall is thin, it is difficult to use a straight probe or an angled probe to conduct ultrasonic testing by direct contact; the current detection method is a single crystal straight probe Water intrusion method or double crystal straight probe water intrusion metho...

AI Technical Summary

Problems solved by technology

[0003] Since the ratio T / D of the wall thickness T to the diameter D of the boiler tube is usually less than 0.20, and the tube wall is thin, it is difficult to use a straight probe or an angled probe to conduct ultrasonic testing by direct contact; the current detection method is a single crystal straight probe Water intrusion method or dual crystal straight probe water intrusion method, but this method has complex detection process, low sensitivity, and cannot detect the pipe row in service

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