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Microfocus three-dimensional CT imaging detection method for hot-melt welding quality of polyethylene pipelines

A hot-melt welding and CT imaging technology is applied in the field of micro-focus three-dimensional CT imaging detection of polyethylene pipe hot-melt welding quality, which can solve the problems of accuracy and on-site applicability that need to be improved and is not widely used, so as to ensure quality, Guarantee the effect of high radiation intensity and high imaging quality

Inactive Publication Date: 2014-12-10
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2008, Professor Zheng Jinyang et al. first proposed the detection method and detection device of coupled focused ultrasonic waves for hot-melt welded joints of polyethylene pipes, but it has not been widely used in engineering practice.
The test shows that the ultrasonic detection method is suitable for the detection of the quality of the hot-melt welding of polyethylene pipes, but its accuracy and field applicability need to be improved

Method used

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  • Microfocus three-dimensional CT imaging detection method for hot-melt welding quality of polyethylene pipelines
  • Microfocus three-dimensional CT imaging detection method for hot-melt welding quality of polyethylene pipelines
  • Microfocus three-dimensional CT imaging detection method for hot-melt welding quality of polyethylene pipelines

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Embodiment 1

[0050] As a preferred embodiment of the present invention, the present invention discloses a micro-focus three-dimensional CT imaging detection method for polyethylene pipe hot-melt welding quality, the steps of which include:

[0051] a. Arrange the micro-focus three-dimensional CT imaging device: select X-ray tubes and flat panel detectors that are used in conjunction with each other. At both ends of the platform, welding joints are arranged on the detection platform between the X-ray tube and the flat panel detector, and the welding joint can rotate freely and move freely between the X-ray tube and the flat panel detector;

[0052] b. Adjustment of welding joint position: open the X-ray tube, and the conical X-ray beam irradiates the welding joint along the circumference and radial direction of the welding joint. Under the initial voltage and current of the X-ray tube, and under the initial position of the welding joint, The computer obtains and displays the real-time image...

Embodiment 2

[0060] Concrete application examples of the present invention, such as Figure 1~4 As shown, in the present invention, the micro-focus three-dimensional CT device of the welded joint 2 of the polyethylene pipe 1 includes: an X-ray tube 3 , a flat panel detector 4 , a detection platform 10 , and a computer 11 . The computer integrates various execution programs for performing three-dimensional CT imaging, such as image calibration programs and CT scanning programs, and these integrated programs are existing technologies in the field of CT imaging. First turn on the key switch, start the equipment and the X-ray tube 3 control device, and turn on the main switch; then turn on the corresponding ray control program, and the system executes the automatic training machine; wait for the training machine to be completed, open the image acquisition program, the system rotation axis 5 and the amplification axis 6 Execute automatic zero return, and the flat panel detector 4 is automatical...

Embodiment 3

[0062] The micro-focus three-dimensional CT imaging detection device provided by the present invention is used to detect a defect-free polyethylene pipe welded joint. First, complete the equipment preparation and commissioning according to the technical scheme provided by the present invention, then place the polyethylene pipe joint on the detection platform according to the steps described in the scheme, adjust the tube voltage to 160KV, the tube current to 160μA, the minimum focus size to 179μm, and the magnification factor to 2.24 times, the pixel size of the flat panel detector is 400 μm, the image acquisition response time is adjusted to 500 ms, the image resolution is 1024×1024, the number of superimposed images is 3, and the number of skipped images is 1. The pipe joint rotates at a constant speed on the detection platform, and the rays penetrate the joint from different directions. The flat panel detector automatically receives the radiation signal and sends it to the c...

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Abstract

The invention discloses a microfocus three-dimensional CT imaging detection method for hot-melt welding quality of polyethylene pipelines, and relates to the field of pressure pipelines detection technology in petroleum industry. The method comprises the steps: a, arranging the microfocus three-dimensional CT imaging position; b, adjusting the position of a welding joint; c, adjusting an image; d, acquiring a sectioned image of the welding joint; e, performing image reconstruction; and f, comparing with an acquired image on a computer to observe a welding defect detection result displayed on an image, and performing defect grade evaluation. The detection method has the advantages of high detection precision, good reliability and the like, is especially capable of reproducing a three-dimensional object and visually obtaining the position, the shape, the size and other information of a defect, and helps to solve the problems about space positioning, depth quantification and integral determination on the nature for the defect.

Description

[0001] technical field [0002] The invention relates to the technical field of pressure pipeline detection in the petroleum industry, in particular to a micro-focus three-dimensional CT imaging detection method for hot-melt welding quality of polyethylene pipelines. Background technique [0003] Polyethylene (PE) pipes have many advantages, such as good corrosion resistance, welding performance, environmental performance, mechanical properties, long service life, light weight, convenient connection, etc., so they are favored by the gas industry. In the medium and low pressure gas pipeline systems in various cities, polyethylene pipes are used as the preferred pipe material. In urban gas pipelines, the connection method between polyethylene pipes is mainly hot-melt welding. This method has strong adaptability, simple operation and low cost, and is widely used in engineering. Its main process is as follows: clamp the pipes and fittings on the frame, and after milling the we...

Claims

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Application Information

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IPC IPC(8): G01N23/04
Inventor 喻建胜何莎彭蕾宋日生彭星煜何慧娟王文韬冯强戴斌金伟
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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