Method for testing welding quality of electro-fusion joint and realizing automatic evaluation

An electrofusion joint and welding quality technology, which is applied in the field of electrofusion welding of plastic pipes or plastic composite pipes, can solve the problems of welding quality inspection and evaluation methods of joints without welding process, and achieve the effect of avoiding the interference of human factors and ensuring safety.

Active Publication Date: 2011-04-13
ZHEJIANG UNIV
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Problems solved by technology

However, this method does not involve how to define the "cold welding" defect, so it is impossible to perform "cold welding" or "over-welding" on polyolefin pipes of different manufacturers, different specifications (pipe diameter, diameter-thickness ratio), and different mater...

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  • Method for testing welding quality of electro-fusion joint and realizing automatic evaluation
  • Method for testing welding quality of electro-fusion joint and realizing automatic evaluation
  • Method for testing welding quality of electro-fusion joint and realizing automatic evaluation

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Embodiment Construction

[0040] The implementation method of the present invention will be described in detail below in conjunction with specific implementation examples.

[0041] In the present invention, the peeling energy per unit area E p And the distance L between the characteristic line and the resistance wire is realized through a tensile peel test and an ultrasonic phased array B-scan section imaging test. Determination of the peeling energy per unit area E of the welded interface by tensile peeling test p , according to the size of the peeling energy per unit area and the failure position of the peeled sample to judge whether the joint welding interface has reached the best mechanical properties. The ultrasound image of the section of the electrofusion joint can be obtained through the ultrasonic phased array B-scan cross-sectional imaging test, and the sound emission intensity of the ultrasonic testing instrument is gradually increased until the echo signals of the resistance wire and the c...

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Abstract

The invention relates to electro-fusion welding technology for plastic pipelines or plastic composite pipelines, and aims to provide a method for testing the welding quality of an electro-fusion joint and realizing automatic evaluation. The method comprises the following steps of: measuring peeling energies E of the electro-fusion joint and the distance L between a characteristic line and a resistance wire under different welding conditions, and acquiring a fitted curve, serving as a calibration basis, of the peeling energy per unit area Ep and the distance L; and testing the welding quality of the electro-fusion joint and realizing the automatic evaluation. The method can prevent unqualified electro-fusion joints from being put into use, so that the safety of plastic pipes and composite pipe systems is ensured. A software module for realizing the method is integrated on an electro-fusion welded or electro-fusion jointed ultrasonic testing instrument, so that a welder automatically controls the welding quality or the testing instrument automatically evaluates an electro-fusion welded joint to be tested, the influence of human factors is avoided, and the quality of a welded joint is more reliable and the evaluation result is more objective.

Description

technical field [0001] The invention relates to the electric fusion welding technology of plastic pipes or plastic composite pipes, in particular to a method for detecting the welding quality of electric fusion joints and realizing automatic judgment. Background technique [0002] With the continuous development of my country's economy and the adjustment of energy structure and policies, it has brought huge development space for my country's pipeline industry. In recent years, plastic pipes and various composite pipes have been rapidly developed and applied in various industries due to their excellent comprehensive performance. Representative products include polyethylene pipes, polypropylene pipes, polyvinyl chloride pipes, aluminum-plastic composite pipes, steel Plastic composite pipe, glass fiber reinforced resin plastic pipe, etc. Electrofusion welding is the most important connection method for plastic pipes and composite pipes. For composite pipes used in complex and ...

Claims

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Application Information

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IPC IPC(8): B29C65/02B29C65/82B29L23/00
Inventor 郑津洋施建峰郭伟灿徐平
Owner ZHEJIANG UNIV
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