Method for detecting external thread defects of steel pipes based on sleeve connection
A detection method, sleeve connection technology, applied in the direction of material magnetic variable etc.
Active Publication Date: 2020-07-07
WUHAN HUAYUYIMU TESTING EQUIP CO LTD
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Problems solved by technology
The traditional magnetostrictive guided wave detection technology generally detects defects based on observing whether there is a defect echo, and the sleeve connection structure itself can be regarded as a large defect, so this defect echo method is no longer applicable to Detection of meshing thread defects in sleeve connection structure
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[0040]A set of standard sleeve connection structure includes: 2 galvanized threaded steel pipes with a nominal diameter of 20mm, a wall thickness of 2mm, a length of 1000mm, and an external thread length of 10mm; 1 threaded sleeve, the thread is right-hand thread. There are a total of 6 sets of standard sleeve connection structures, and the defects of each standard sleeve connection structure are: 1) Standard sleeve connection structure 1: no defects; 2) Standard sleeve connection structure 2: one of the steel pipes has an external thread Circumferential notches with an equivalent cross-sectional loss ratio of 2.5%; 3) Standard sleeve connection structure 3: A circumferential notch with an equivalent cross-sectional loss ratio of 5.8% is engraved on the external thread of one of the steel pipes. Groove; 4) Standard sleeve connection structure 4: a circumferential groove with an equivalent cross-sectional loss ratio of 9.1% is engraved on the external thread of one of the steel...
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Abstract
The invention belongs to the related technical field of nondestructive testing, and discloses a method for detecting external thread defects of steel pipes based on sleeve connection. The detection method comprises the steps of (a) for two to-be-detected steel pipes, connecting the two to-be-detected steel pipes by adopting a sleeve, arranging a permanent magnet bias magnetizer, an excitation coiland a receiving coil on the steel pipes, and detecting magnetostriction guided wave echo signals by the receiving coil; (b) selecting two standard sleeves without defects, measuring magnetostrictionguided wave echo signals of the two standard sleeves, and taking the magnetostriction guided wave echo signals as a reference; (c) selecting a plurality of defective standard sleeves, measuring to obtain a plurality of magnetostriction guided wave echo signals, and establishing a reference curve according to a measurement result; and (d) measuring the to-be-detected steel pipes, and comparing themeasurement result with the reference curve to obtain the defect cross section area of the steel pipes. The method is reliable in detection result, can be used for detecting thread defects of varioussleeve connections, and is high in applicability.
Description
technical field [0001] The invention belongs to the technical field related to non-destructive testing, and more specifically relates to a method for detecting defects of external threads of steel pipes based on sleeve connections. Background technique [0002] The sleeve connection structure is one of the main connection components in the building. Due to special reasons, some sleeve connection structures are in a humid and closed environment for a long time, or are buried in the soil for a long time, which is very prone to corrosion defects. In order to prevent potential safety hazards, it should be Defect detection is performed on the mating thread of the sleeve connection structure, and most sleeve connection structures can only be tested in service, so a suitable in-service detection method is needed. [0003] Guided wave detection technology has the advantages of easy access to invisible areas and long-distance detection with single-point excitation. As a commonly used...
Claims
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IPC IPC(8): G01N27/82
CPCG01N27/82
Inventor 徐江胡超越李云飞
Owner WUHAN HUAYUYIMU TESTING EQUIP CO LTD