NDLI: Safety Assessment of Cold Welding Defect in Electro-Fusion Joint of Polyethylene Pipe

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Shi, Jianfeng Zheng, Jinyang Guo, Weican Xu, Cheng
Copyright Year	2012
Abstract	Cold welding defect is the most common defect in electro-fusion (EF) joint for connecting polyethylene (PE) pipe. In our previous study[1], the cold welding defect is successfully inspected by an Eigen-line method based on phased array ultrasonic testing technology. However, small amount of research has been reported on the acceptance criterion of cold welding defect in EF joint. In this paper, the bonding strength of EF joint is measured using a peeling test. The bonding energy of welding interface is calculated both by phenomenological model and deformation energy analysis method. EF joints with different degrees of cold welding are made and used for peeling tests. The results show that the bonding energy of fused interface rises rapidly after bonding and then goes through a plateau region. The starting point of the plateau region in the bonding energy vs. welding time curve is regarded as the minimum required welding time of EF joint. Based on bilinear fitting, the acceptable criterion of cold welding defect is proposed.
Sponsorship	Pressure Vessels and Piping Division
Starting Page	189
Ending Page	196
Page Count	8
File Format	PDF
ISBN	9780791855003
DOI	10.1115/PVP2012-78655
Volume Number	Volume 1: Codes and Standards
Conference Proceedings	ASME 2012 Pressure Vessels and Piping Conference
Language	English
Publisher Date	2012-07-15
Publisher Place	Toronto, Ontario, Canada
Access Restriction	Subscribed
Subject Keyword	Electro-fusion Cold welding Safety assessment Polyethylene pipe Peeling test Welding Polyethylene pipes Safety
Content Type	Text
Resource Type	Article

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