A detection method for steel pipe external thread defects based on sleeve connection
A detection method and sleeve connection technology, applied in the direction of material magnetic variables, etc., to achieve the effect of simple process, high measurement accuracy and time saving
Active Publication Date: 2022-03-15
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echo, and the sleeve connection structure itself can be regarded as a large defect, so this defect echo method is no longer applicable to Detection of meshing thread defects in sleeve connection structure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 standard sleeve connection structure includes 2 nominal diameters of 20 mm, a wall thickness of 2 mm, a length of 1000 mm, and a length of 10 mm having a length of 10 mm; φ20 [75 ° * 2.5P] straight 1 threaded sleeve, thread is right-threaded. A total of 6 standard sleeve connecting structures, the defects of each set of standard sleeve connect structures: 1) Standard sleeve connection structure 1: No defects; 2) Standard sleeve connection structure 2: 1 steel tube external thread There is a circumferential directional slot of 2.5% of the equivalent cross-sectional loss ratio; 3) Standard sleeve connection structure 3: A circumstrained direction ratio of equivalent cross-sectional ratio is 5.8% in one steel pipe external thread Slot; 4) Standard sleeve connection structure 4: An equivalent cross-sectional ratio of 9.1% in one steel tube externally; 5) Standard sleeve connection structure 5: 1 steel pipe The external thread is engraved with an equivalent cross-sectional loss...
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Abstract
The invention belongs to the technical field related to nondestructive testing, and discloses a method for detecting defects of steel pipe external threads based on sleeve connection. The detection method includes the following steps: (a) For two steel pipes to be detected, a sleeve is used to connect the two steel pipes to be detected, a permanent magnetic bias magnetizer is set on the steel pipes, an excitation coil and a receiving coil are used, and the receiving coil detects magnetostriction Guided wave echo signal; (b) select two non-defective standard sleeves, measure the magnetostrictive guided wave echo signals of the two standard sleeves, and use it as a reference; (c) select multiple defective The standard sleeve, measure the multiple magnetostrictive guided wave echo signals obtained, and establish a reference curve according to the measurement results; (d) measure the steel pipe to be tested, compare the measurement results with the reference curve, and obtain the cross-sectional area of the steel pipe defect . The method of the invention has reliable detection results, can be used for thread defect detection of various sleeve connections, and has strong applicability.
Description
Technical field [0001] The present invention is a non-destructive detection related to the art, and more particularly to a method of detecting the external thread defects connected to the sleeve. Background technique [0002] The sleeve connection structure is one of the main connecting members in the building. Some sleeve connection structures are in a wet, closed environment, or long buried in the soil, in order to prevent safety hazards. The sleeve connection structure engages the thread for defect detection, and most of the sleeve connecting structures can only perform in service detection, so there is a suitable operational detection method. [0003] The guide wave detection technology has the advantages of easy to reach the inability to reach, and the single-point excitation can achieve advantages such as long distance detection, and magnetostrictive wave detection techniques act as a commonly used wave detection technology, and has convenient detection, no needle, no coupl...
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