Method for determining electro-fusion joint cold-welding defects
A technology of electrofusion joints and determination methods, which is applied in the direction of using sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc., can solve the problems that cold welding determination methods are difficult to implement, and achieve cost-saving effects
Active Publication Date: 2013-07-31
ZHEJIANG UNIV
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Problems solved by technology
The difference in product welding process between different manufacturers will make it difficult to implement the cold welding judgment method described in the reference patent
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Embodiment Construction
[0028] 1) Use an ultrasonic phased array detection imaging instrument to detect from the inner surface of the pipe where the electrofusion joint is welded, and adjust the gain and interface coupling conditions until the ultrasonic detection map is obtained (such as figure 1 shown);
[0029] 2) The distance L between the characteristic line in the measurement diagram and the pipe-sleeve interface i (mm): The specific method is to measure the number of pixels between adjacent coils of the resistance wire in the image as N j , measure the number of pixels N between the feature line and the pipe-sleeve interface in the image L , then the distance L between the feature line and the pipe-sleeve interface i Calculate according to the following formula:
[0030] L i = N L N j · L j
[0031] I...
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The invention relates to a technology for welding a plastic pipeline and aims to provide a method for determining electro-fusion joint cold-welding defects. The method comprises the following steps of: detecting from an inner surface of a pipe on an electro-fusion joint welding part through an ultrasonic phased array detection imaging instrument to obtain an ultrasonic detection graph; and measuring a distance Li between a characteristic line in the ultrasonic detection graph and a pipe-sleeve interface in different directions, wherein no cold-welding defect is present at the detected electro-fusion joint if the minimum Lm accords with the set criteria. The method for detecting the electro-fusion joint cold-welding defects is higher in practicality, is generally applicable to different types of electro-fusion sleeves by different welding processes in different manufacturers and can be applied to cold-welding detection of electro-fusion joints formed by the pipes and the electro-fusionsleeves in different matching relationships; and the cold-welding conditions can be determined by measuring welding conditions of one electro-fusion joint only, a normal welding joint is not needed to be welded to perform secondary measurement, and the cost of welding joint preparation and ultrasonic detection is saved.
Description
technical field [0001] The invention relates to plastic pipe welding technology, in particular to a method for judging defects of cold welding of electric fusion joints. technical background [0002] In recent years, the adjustment of my country's energy structure and policies and the further implementation of important energy strategic plans such as the West-East Gas Pipeline have brought huge room for development to my country's pipeline industry. Plastic pipes and thermoplastic reinforced plastic composite pipes have been rapidly developed and applied in various industries due to their excellent comprehensive mechanical properties. The main representative products include polyethylene pipes, polypropylene pipes, polyvinyl chloride pipes, aluminum-plastic composite pipes, Steel-plastic composite pipe, glass fiber reinforced plastic pipe, etc. Electrofusion welding is one of the most important connection methods for plastic pipes and composite pipes. Especially for composi...
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IPC IPC(8): B29C65/82G01N29/06
CPCB29C65/8292B29C65/342B29C65/3476B29C65/8253B29C66/522B29C66/71B29C66/7212
Inventor 施建峰郑津洋郭伟灿徐平徐成
Owner ZHEJIANG UNIV