Steel tube supersonic flaw detecting longitudinal defect oil-dipping finger touch positioning method

A longitudinal defect and touch positioning technology, which is applied in the direction of using sound wave/ultrasonic wave/infrasonic wave to analyze solids, etc., to avoid missed defects, reduce the generation of waste products, and improve the qualified rate

Inactive Publication Date: 2008-08-13
TIANJIN PIPE (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problems existing in the above-mentioned technologies, the object of the present invention is to provide a method for locating longitudinal defects of steel pipe ultrasonic flaw detection with fingers dipped in oil and touching. , steel tape and other tools, and there is no need to use any auxiliary methods such as defect positioning rulers to achieve the purpose of fast, accurate and easy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: The ultrasonic flaw detection method for longitudinal defects of steel pipes according to the present invention includes the following two steps:

[0015] (1) Use the probe to find the highest echo of the defect to reach the reference wave height, and then keep the position of the probe on the steel pipe;

[0016] (2) Fingers dipped in oil start from the front edge of the probe and touch the surface of the steel pipe forward along the circumferential direction of the steel pipe. At this time, the amplitude of the defect wave will jump up and down with the beat of the finger touching the surface of the steel pipe. Observe the waveform jumping until the defect wave stops. , and then touch in the opposite direction along the original path to determine the last jumping point, which is the position of the defect on the steel pipe surface.

[0017] The oil dipped in the fingers in the above step (2) is ordinary engine oil or hydraulic oil, which is commonly used...

Embodiment 2

[0018] Example 2: This implementation is to detect the oil casing pipe of Φ244.48×11.99mm. During the detection process, it is found that there are many excessive defects invisible to the naked eye. In order to analyze the nature and cause of the defects, this positioning method is used to detect the excessive Precise positioning of defects, the positioning process is as follows:

[0019] (1) Use the probe to scan around the defect, and observe the change of the defect echo on the oscilloscope screen of the flaw detector at the same time, find the highest reflected echo of the defect and adjust the attenuator to make it reach an amplitude height that is easy to observe, and then keep the probe The position on the steel pipe does not move.

[0020] In the process of scanning along the circumference of the oil casing, try to keep the position of the defect wave on the baseline of the oscilloscope screen away from the initial wave, that is, the probe should be as far away from th...

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PUM

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Abstract

The present invention provides a steel tube ultrasonic inspection longitudinal defect finger dunking oil touching orientation method including steps of: (1) finding highest echo of defect by probe to achieve reference wave height and keeping the probe fixed on the steel tube; (2) touching steel tube surface frontad around the circumference direction from the front of the probe by finger dipped oil, the range of defect wave will bob along with the moving time of finger touched along the surface of steel tube, touching in negative direction along with original touching path until the defect wave stop bobbing, confirming the last jumping point, namely the position of the defect on the steel tube. The method of present invention can direct detection personnel determining preliminarily the defect to employ efficient measure in detection process to avoid defect determination miss. In addition, the method of present invention can locate steel tube to be repaired and grinded to determine again to save expense of batch steel tubes reject to improve the qualified rate of steel tubes. And the method meets field needs and improves precision and speed of defect location.

Description

technical field [0001] The invention relates to a steel pipe flaw detection process, in particular to a steel pipe ultrasonic flaw detection longitudinal defect detection method with fingers dipped in oil and touching and locating. Background technique [0002] When performing ultrasonic flaw detection on steel pipes, it is often necessary to accurately locate the defects exceeding the standard, that is, to determine the axial and circumferential positions of the defects on the steel pipe. The purpose of positioning is twofold: one is to analyze the nature and causes of defects, so that effective measures can be taken in future production to avoid batch waste; Rate. Because for defects invisible to the naked eye, if the exact position of the defect on the steel pipe cannot be marked, no matter how advanced the analysis method is, it is impossible to analyze the correct result. [0003] Automatic line flaw detection can only roughly determine the axial position of the defec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04
Inventor 赵仁顺张学江
Owner TIANJIN PIPE (GROUP) CORP
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