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    Formation Mechanism of the Eigen-line in Electrofusion Joints of Polyethylene Pipes

    Source: Journal of Pressure Vessel Technology:;2011:;volume( 133 ):;issue: 005::page 51403
    Author:
    Jianfeng Shi
    ,
    Weican Guo
    ,
    Jinyang Zheng
    DOI: 10.1115/1.4003471
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Cold welding is the most dangerous defect in the electrofusion joint of polyethylene (PE) pipes. A proprietary method was developed to detect the degree of cold welding by using an Eigen-line, which was discovered in our previous study. To understand when, where, and how the Eigen-line would appear, the forming mechanism was investigated in this paper. Three factors, i.e., micro-air-bubbles, difference of acoustic impendence of PE in the melted and unmelted region, and small-crowded crystals in the region of the interface of melted and unmelted region, may cause the appearance of the Eigen-line. It was found that the number of Eigen-lines was the same as that of welding times when rewelded with decreasing welding time, and only one Eigen-line could be observed when rewelded with increasing welding time. The result showed that small-crowded crystals in the region of the interface of melted and unmelted region may be the dominating factor. This was then verified by the temperature analysis and differential DSC tests, and the forming process of the small-crowded crystals was discussed in detail.
    keyword(s): Temperature , Crystals , Welding , Acoustics , Polyethylene pipes , Heating , Mechanisms , Wire , Cooling , Crystallization , Bubbles AND Pipes ,
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      Formation Mechanism of the Eigen-line in Electrofusion Joints of Polyethylene Pipes

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    contributor authorJianfeng Shi
    contributor authorWeican Guo
    contributor authorJinyang Zheng
    date accessioned2017-05-09T00:46:35Z
    date available2017-05-09T00:46:35Z
    date copyrightOctober, 2011
    date issued2011
    identifier issn0094-9930
    identifier otherJPVTAS-28550#051403_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/147437
    description abstractCold welding is the most dangerous defect in the electrofusion joint of polyethylene (PE) pipes. A proprietary method was developed to detect the degree of cold welding by using an Eigen-line, which was discovered in our previous study. To understand when, where, and how the Eigen-line would appear, the forming mechanism was investigated in this paper. Three factors, i.e., micro-air-bubbles, difference of acoustic impendence of PE in the melted and unmelted region, and small-crowded crystals in the region of the interface of melted and unmelted region, may cause the appearance of the Eigen-line. It was found that the number of Eigen-lines was the same as that of welding times when rewelded with decreasing welding time, and only one Eigen-line could be observed when rewelded with increasing welding time. The result showed that small-crowded crystals in the region of the interface of melted and unmelted region may be the dominating factor. This was then verified by the temperature analysis and differential DSC tests, and the forming process of the small-crowded crystals was discussed in detail.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleFormation Mechanism of the Eigen-line in Electrofusion Joints of Polyethylene Pipes
    typeJournal Paper
    journal volume133
    journal issue5
    journal titleJournal of Pressure Vessel Technology
    identifier doi10.1115/1.4003471
    journal fristpage51403
    identifier eissn1528-8978
    keywordsTemperature
    keywordsCrystals
    keywordsWelding
    keywordsAcoustics
    keywordsPolyethylene pipes
    keywordsHeating
    keywordsMechanisms
    keywordsWire
    keywordsCooling
    keywordsCrystallization
    keywordsBubbles AND Pipes
    treeJournal of Pressure Vessel Technology:;2011:;volume( 133 ):;issue: 005
    contenttypeFulltext
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