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| 聚乙烯电熔接头冷焊缺陷的超声检测方法 | |
| 引用本文： | 郑津洋,郭伟灿,施建峰,丁守宝,王卉,丁良玉.聚乙烯电熔接头冷焊缺陷的超声检测方法[J].焊接学报,2008,29(9):1-4. |
| 作者姓名： | 郑津洋 郭伟灿 施建峰 丁守宝 王卉 丁良玉 |
| 作者单位： | 1. 浙江大学,化工机械研究所,杭州,310027 2. 浙江大学,化工机械研究所,杭州,310027;浙江省特种设备检验研究院,杭州,310020 3. 浙江省特种设备检验研究院,杭州,310020 4. 浙江中财管道科技股份有限公司,浙江,新昌,312500 |
| 基金项目： | 国家科技支撑计划基金 |
| 摘 要： | 聚乙烯管道广泛应用于城市燃气输送。冷焊是聚乙烯管道接头最危险的缺陷之一，也是现有无损检测方法难以发现的一类缺陷。文中在电熔焊接接头检测中首次发现聚乙烯电熔接头内部存在一条由微小气泡造成的特征线，特征线与电阻丝之间的距离与冷焊程度有明确的对应关系。在此基础上，提出一种全新的冷焊缺陷超声检测方法，即先利用相控阵超声检测系统测量特征线和电阻丝间的距离，再利用经验公式评估冷焊程度。结果表明，所提方法判断冷焊具有足够的精度，可以应用于聚乙烯管道焊接工艺研究和接头质量检测。 |
| 关 键 词： | 聚乙烯管道 电熔接头 冷焊 超声检测 |
| 收稿时间： | 2007/10/24 0:00:00 |
Ultrasonic inspection to detect cold welding in electro-fusion joint of polyethylene pipes |
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| ZHENG Jinyang,GUO Weican,SHI Jianfeng,DING Shoubao,WANG Hui and DING Liangyu.Ultrasonic inspection to detect cold welding in electro-fusion joint of polyethylene pipes[J].Transactions of The China Welding Institution,2008,29(9):1-4. | |
| Authors: | ZHENG Jinyang GUO Weican SHI Jianfeng DING Shoubao WANG Hui and DING Liangyu |
| Affiliation: | Institute of Chemical Machinery and Process Equipment, Zhejiang University, Hangzhou 310027, China,Institute of Chemical Machinery and Process Equipment, Zhejiang University, Hangzhou 310027, China;Zhejiang Special Equipment Inspection and Research Institute, Hangzhou 310020, China,Institute of Chemical Machinery and Process Equipment, Zhejiang University, Hangzhou 310027, China,Zhejiang Special Equipment Inspection and Research Institute, Hangzhou 310020, China,Institute of Chemical Machinery and Process Equipment, Zhejiang University, Hangzhou 310027, China and Zhejiang Zhongcai Pipes Technical Co. Ltd., Xincang 312500, Zhejiang, China |
| Abstract: | Polyethylene (PE)pipe is widely used in the gas distribution networks.Cold welding caused by insufficient input of heat energy, which can not be detected by nondestructive test methods available, is one of the most dangerous defects in the joint of PE pipes.It was discovered that there is an Eigen-line in the electro-fusion (EF)joint of PE pipes due to a great amount of separated micro-bubbles, and the distance between the line and heating wires can be used to measure the degree of cold welding.Furthermore, a unique method was developed to detect cold welding.The degree of cold welding can be assessed with an empirical formula by measuring the distance between the line and metal wires with a proprietary system of ultrasonic inspection.Experiments show that the method can accurately detect cold welding and be used in the research of welding procedure, and quality inspection. |
| Keywords: | polyethylene pipe electrofusion joint cold welding ultrasonic testing |
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