Ultrasonic detection device and method for PA-TOFD combined polyethylene pipeline hot-melt butt joint

A PA-TOFD and hot-melt butt joint technology, which is applied in the direction of measuring devices, using sound waves/ultrasonic waves/infrasonic waves to analyze solids, and using sound waves/ultrasonic waves/infrasonic waves for material analysis, etc., can solve sound wave attenuation, weaken sound beam diffusivity, receive Echo energy is weak and other problems, to achieve the effect of increasing energy, improving detection depth and imaging effect, and overcoming insufficient ability

Active Publication Date: 2018-09-21
ZHEJIANG UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the detection depth increases, the sound wave attenuates severely in polyethylene, and the received echo energy is weak, so it is impossible to detect the hot-melt butt joint of polyethylene pipe with thick wall
Increasing the size of the probe increases the energy of the sound beam, but reduces the spread of the sound beam

Method used

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  • Ultrasonic detection device and method for PA-TOFD combined polyethylene pipeline hot-melt butt joint
  • Ultrasonic detection device and method for PA-TOFD combined polyethylene pipeline hot-melt butt joint
  • Ultrasonic detection device and method for PA-TOFD combined polyethylene pipeline hot-melt butt joint

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Experimental program
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Effect test

Embodiment 1

[0050] Embodiment 1: Implementation Example of Conventional Phased Array Scanning Mode

[0051] The phased array detection of the present invention adopts the S-scanning scheme, the phased array probe adopts the form of self-generating and self-receiving, and uses the effective sound path range to cover the detection area as much as possible. The calculation principle of the delay rule of the sound beam focusing is as follows: Figure 7 shown. The waveform adopts longitudinal wave, and the focus depth r and scanning range are determined according to the relative position of the defect and the probe. According to the above detection parameters, the delay time τ of each array element can be calculated by formula 1 i .

[0052]

[0053] In the formula, c is the propagation speed of ultrasonic longitudinal wave in polyethylene; l i is the distance from the i-th array element to the set focal point; τ 0 is the time constant, the purpose is to avoid τ i Negative latency occu...

Embodiment 2

[0057] Embodiment 2: Example of detection method combining phased array and TOFD

[0058] When the present invention detects TOFD, a phased array probe is used as the sound wave emission probe. In order to make the sound wave emitted by the phased array probe have good diffusivity, the excitation of the phased array probe adopts the time delay rule that makes the sound wave diverge, and the sound beam The calculation principle of the divergent delay law is as follows: Figure 8 shown. In the actual TOFD detection, set the number n of array elements participating in the cylindrical wave emission and the curvature radius R of the cylindrical wave. According to the above detection parameters, the delay time τ of each array element can be calculated by formula 2 i .

[0059]

[0060] In the formula, d is the array element spacing of the probe; τ 0 is the time constant, the purpose is to avoid τ i Negative latency occurs.

[0061] Also take the above-mentioned probe as an e...

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Abstract

The invention relates to a non-destructive testing technology of polyethylene pipeline hot-melt butt joint and aims to provide an ultrasonic detection device and method for PA-TOFD combined polyethylene pipeline hot-melt butt joint. The ultrasonic detection device comprises a circumferential scanning track which is arranged on a polyethylene pipeline; the circumferential scanning track is providedwith a circumferential scanning device; one end of the connecting rod is fixed on the top of the circumferential scanning device, and the other end of the connecting rod is respectively provided witha phased array probe and a single crystal straight probe through a probe holder; the two probes are positioned on two sides of the hot-melt butt joint of the polyethylene pipeline, and a gap is maintained between the end part of the probe and the polyethylene pipeline. The ultrasonic detector has two detection functions of ultrasonic phase control detection and TOFD detection, and the phased array probe is used as an acoustic wave transmitting probe for ultrasonic phased array detection and TOFD detection. And the two detection results are synchronously displayed in real time. The method overcomes the defects that the traditional pulse-type ultrasonic detection technology is not intuitive, the data cannot be recorded and stored, and the defects of precise positioning and quantification are difficult to be made.

Description

technical field [0001] The invention relates to a non-destructive testing technology for hot-melt butt joints of polyethylene pipes, in particular to an ultrasonic testing method for hot-melt butt joints of polyethylene pipes combined with ultrasonic phased array (PA) and ultrasonic time-of-flight diffraction (TOFD). Background technique [0002] Compared with metal pipes, polyethylene pipes have the advantages of good toughness, corrosion resistance, long service life, economical and environmental protection, and have been successfully applied in marine, oil and gas, city gas and other fields for decades, and have been used in nuclear power plants in recent years Water pipelines have very broad application prospects. [0003] Hot melt welding is the most commonly used connection method between polyethylene pipes. It has strong applicability and low cost, and is suitable for polyethylene pipes with large outer diameters. At present, more than 80% of polyethylene pipes with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/07G01N29/26
CPCG01N29/07G01N29/262
Inventor 施建峰秦胤康郑津洋郭伟灿
Owner ZHEJIANG UNIV
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