Microwave scanning detection method and microwave detection device of polyethylene pipe hot-molten joint

A hot-melt joint and scanning detection technology, which is applied in the direction of using microwave flaw detection, can solve the problems of not finding detection methods, achieve rapid detection, and avoid material pollution.

Inactive Publication Date: 2012-03-21
嘉兴市特种设备检验检测院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the detection of hot-melt joints of polyethylene pipes, which is the most widely used at present, no effective detection method has been found so far.

Method used

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  • Microwave scanning detection method and microwave detection device of polyethylene pipe hot-molten joint
  • Microwave scanning detection method and microwave detection device of polyethylene pipe hot-molten joint
  • Microwave scanning detection method and microwave detection device of polyethylene pipe hot-molten joint

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Effect test

Embodiment 1

[0049] The microwave detection device provided by the invention is used to detect a perfect polyethylene pipe hot-melt joint. First, the outer surface of the joint is simply treated to make it smooth and flat, and then the joint is detected according to the steps in the technical solution provided by the present invention. The microwave frequency used is 24 GHz, and the scanning speed is 10 cm / s. The distance between the outer surface of the joint and the joint is controlled at 3 cm; in this embodiment, the signals recorded by the receiving sensors A and B are respectively displayed through the baseline amplitude, and the obtained microwave scanning images are shown in Figure 4 . In the figure, the X coordinate represents the axial direction, and the Y coordinate represents the radial direction. The heat affected joint has a width of approximately 0.25 inches and a midline at approximately Y=2. The scanning image of the hot-melt joint is relatively uniform in the entire axi...

Embodiment 2

[0051] A polyethylene pipe hot-melt joint containing cold welding defects is detected by using the microwave detection device provided by the invention. First, simple treatment is performed on the outer surface of the joint to make it smooth, and then the joint is detected according to the steps in the technical solution provided by the present invention. The microwave frequency used is 24 GHz, and a uniform scanning speed is adopted. The scanning speed is 15 cm / s, and the microwave probe The distance between the outer surface of the joint and the joint is controlled at 2cm; in this embodiment, the signals recorded by the receiving sensors A and B are respectively displayed through the baseline amplitude. When the traveling microwave encounters a defect, the change in the dielectric constant makes the microwave A reflection occurs. The reflected microwave signal and the emitted microwave signal form an interference pattern, and the obtained microwave scanning image is shown in...

Embodiment 3

[0053] The microwave detection device provided by the invention is used to detect a polyethylene pipe hot-melt joint formed by applying excessive pressure during butt jointing. First, simple treatment is performed on the outer surface of the joint to make it smooth, and then the joint is detected according to the steps in the technical solution provided by the present invention. The microwave frequency used is 24 GHz, and a uniform scanning speed is adopted. The scanning speed is 14 cm / s, and the microwave probe The distance between the outer surface of the joint and the joint is controlled at 4cm; in this embodiment, the signals recorded by the receiving sensors A and B are respectively displayed through the baseline amplitude. When the traveling microwave encounters a defect, the change in the dielectric constant makes the microwave A reflection occurs. The reflected microwave signal and the emitted microwave signal form an interference pattern, and the obtained microwave sc...

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Abstract

The invention relates to the field of pressure pipe detection, and specifically, relates to a microwave scanning detection method and a microwave detection device of a polyethylene pipe hot-molten joint in welding quality. The microwave scanning detection method based on the microwave detection device can detect multiple types of defects, especially, can effectively technical detects of cold welding, has the advantages of high sensitivity, high detection precision and good reliability. The microwave scanning detection method capable of detecting polyethylene pipe hot-molten joint defects comprises the following steps that a microwave probe comprising a microwave transmitting and receiving device is positioned on a side of an outer surface of a fusion zone of a polyethylene pipe hot-moltenjoint; the microwave probe comprising the microwave transmitting and receiving device is moved along the outer surface of the polyethylene pipe hot-molten joint at a certain speed for scanning; and obtained microwave signals is subjected to signal transition and computer processing to form a scanned image. The microwave detection device comprises the microwave probe comprising the microwave transmitting and receiving device, a mechanical scanning device, a scanning control device, a signal transition system, a computer and connection cables. The microwave detection device is convenient for operation and has a low cost.

Description

technical field [0001] The invention relates to the detection field of pressure pipelines, in particular to a microwave scanning detection method and a detection device for the welding quality of hot-melt joints of polyethylene pipelines. Background technique [0002] Polyethylene (PE) pipe has many excellent properties, such as low temperature resistance, corrosion resistance, good toughness, crack resistance, convenient connection, good scratch resistance, good resistance to rapid crack transfer, etc. 4 times. Therefore, polyethylene pipe has become the best choice for urban gas transmission network and medium and low pressure water supply network. The connection methods between polyethylene pipes mainly include hot-melt butt joint (hot-melt welding) and electric fusion connection. The technology of hot-melt butt joint is more mature, and the connection cost is lower. Therefore, in the current practical application, especially when using large nominal diameter pipes, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N22/02
Inventor 潘金平谭连江潘柏定祝新伟
Owner 嘉兴市特种设备检验检测院
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