Research progress in polyethylene pipeline hot melt welding technology

doi:10.19491/j.issn.1001-9278.2022.10.016

Abstract

Abstract:

In this review paper， the influencing factors of the hot⁃melt welded joints of polyethylene pipes were briefly described， and the research progress in the reliability testing methods of hot⁃melt joints at home and abroad was reviewed. The influence of welding parameters on the quality of the joint was summarized， and the failure mechanisms of the joint were analyzed. The change of welding parameters can significantly affect the performance of hot⁃melt joints， and the selection of optimal welding parameters can improve their reliability even across the whole piping system. The related research on the hot⁃melt joints was summarized from three aspects： mechanical properties， finite element simulation and nondestructive testing. It is expected that a comprehensive evaluation standard will be established for the mechanical properties of hot⁃melt welded joints in the future. This can reduce the experimental time and test cost. With the innovation of materials and the development of scientific and technological means， the finite element simulation and non⁃destructive testing technology are expected to replace mechanical experiments， and it will become the main method for reliability testing of hot⁃melt joints in the future.

Key words: polyethylene, hot melt welded joint, reliability evaluation, finite element simulation, non?destructive testing

CLC Number:

TQ325.1⁺2

LI Zhaopu, WU Liwen, QIAO Liang, FAN Junming, ZHANG Yi. Research progress in polyethylene pipeline hot melt welding technology[J]. China Plastics, 2022, 36(10): 104-116.

Figures/Tables 14

Fig.1. Common application field of polyethylene pipes

Fig.2. Flow chart of hot melt welding

Fig.3. Relationship between tensile strength of welded joints and welding temperature

Fig.4. Stress⁃strain curves under different welding pressure

Fig.5. Profile of crimping generated by different welding pressure

Fig.6. Tensile sample of hot melt joint

Fig.7. Tensile test of hot melt joint of polyethylene pipe

Fig.8. CRB sample

Fig.9. Comparison of CRB sample sections between base material and welding one

Fig.10. Extrusion and cooling molding process of polyethylene pipe

Fig.11. Distribution of circumferential residual stress in polyethylene pipe

Fig.12. Finite element simulation of crack growth near the weld bead

技术名称	优点	缺点
超声脉冲回波检测	成本低、操作简单	检测灵敏度低、对复杂结构检测困难
超声相控阵检测	精度高，检测结果直观	限制试件厚度
超声衍射时差检测	灵敏度高	对近表面缺陷和横向缺陷检测困难

Tab.1. Comparison of ultrasonic detection methods

Fig.13. Ultrasonic detection results of different welding defects

References 76

1	施建峰，胡安琪，郑津洋. 聚乙烯管材标准发展现状分析［J］. 中国塑料， 2021， 35（3）： 112⁃123.
	SHI J F， HU A Q， ZHENG J Y. Development status of technical standards in polyethylene piping［J］. China Plastics， 2021，35（3）：112⁃123.
2	王振超，张莹，彭伊娟，等. 聚乙烯管道热熔接头可靠性评价方法研究［J］. 中国塑料， 2022， 36（1）： 148⁃159.
	WANG Z C， ZHANG Y， PENG Y J， et al. Research progress on reliability assessment methods of polyethylene pipes fusion Joint［J］. China Plastics， 2022，36（1）：148⁃159.
3	李茂东，史君林，黄国家，等. 美国塑料管道失效数据对我国塑料管道安全管理的启发［J］. 中国塑料， 2018， 32（3）： 92⁃98.
	LI M D， SHI J L， HUANG G J， et al. Revelation of the american plastic pipe failure data to China plastic pipe safety management［J］. China Plastics， 2018，32（3）：92⁃98.
4	中国轻工业联合会. 塑料管材和管件燃气和给水输配系统用聚乙烯（PE）管材及管件的热熔对接程序：［S］. 北京：中国标准出版社， 2015.
5	张伟，彭恩凯，曾钦达，等. 聚乙烯燃气管道热熔对接焊国内外标准对比分析［J］. 焊接技术， 2015， 44（5）： 66⁃71.
	ZHANG W， PENG E K， ZENG Q D， et al. Comparative analysis of domestic and foreign standards for hot melt butt welding of polyethylene gas pipeline［J］. Welding Techno⁃logy， 2015， 44（5）： 66⁃71.
6	Standard Practice for Heat Fusion Joining of Polyethylene Pipe and Fittings：［S］. American Society for Testing and Materials， 2013.
7	Welding of Thermoplastics Heated Tool Welding of Pipes， Pipeline Component and Sheets Made of PE⁃HD：DVS 2207⁃1 ［S］. Deutscher Verband Für Schweissen Und Verwandte Verfahren E V， 2005.
8	Plastics Pipes and Fittings⁃Butt Fusion Jointing Procedures for Polyethylene （PE） Pipes and Fittings Used in the Construction of Gas and Water Distribution Systems：［S］. The international organization for standardization， 2017.
9	王晓芹. 聚乙烯管材热熔对接焊拉伸性能的研究［J］. 甘肃科技， 2017， 33（11）： 52⁃54.
	WANG X Q. Research on tensile properties of polyethylene pipe by hot melt butt welding［J］. Gansu Science and Technology， 2017， 33（11）： 52⁃54.
10	阳代军，霍立兴，张玉凤. 聚乙烯管道热熔对接焊工艺参数对焊接接头性能的影响［J］. 焊管， 2004（1）： 17⁃20，61.
	YANG D J， HUO L X， ZHANG Y F. Influence of welding parameters on properties of polyethylene pipe butt welding［J］. Welded Pipe and Tube， 2004（1）： 17⁃20，61.
11	戴鸿滨，姜婷婷，康悦，等. 高密度聚乙烯管道热熔焊接头力学性能［J］. 焊接， 2015（12）： 42⁃47，71.
	DAI H B， JIANG T T， KANG Y， et al. Mechanical properties of high density polyethylene pipe hot melt welding joint［J］. Welding & Joining， 2015（12）：42⁃47，71.
12	卢涛，文华斌，张欣欣，等. PE管道热熔焊接工艺参数的实验［J］. 工程塑料应用， 2021，49（5）： 69⁃74.
	LU T， WEN H B， ZHANG X X， et al. Experimental on technological parameters of hot melt welding of PE pipe［J］. Engineering Plastics Application， 2021，49（5）： 69⁃74.
13	Dai Hong bin， Peng Jun. The effects of welded joint characteristics on its properties in HDPE thermal fusion welding［J］. World Scientific， 2017， 31（15）：175⁃185.
14	郑津洋，秦永泉，施建峰，等. 聚乙烯管道热熔接头卷边对拉伸性能的影响［J］. 中国塑料， 2009， 23（7）： 77⁃80.
	ZHEN J Y， QIN Y Q， SHI J F， et al. Effect of butt fusion welding beads on tensile properties of polyethylene pipes［J］. China Plastics， 2009， 23（7）： 77⁃80.
15	范自伟，李俊，李涛，等. 温度对PE燃气管热熔焊接接头性能的影响［J］. 工程塑料应用， 2018， 46（1）： 36⁃39.
	FAN Z W， LI J， LI T， et al. Effect of temperature on the polyethylene gas pipe hot melt welding joint［J］. Engineering Plastics Application， 2018， 46（1）： 36⁃39.
16	Bergstrom G， Nilsson S， Lindqvist L. The influence from pipe surface， weld beads and protective skins on long term failure times for PE butt fusion joints［C］. Italy： Plastics Pipes， 2004. Engineering Plastics Application， 2018， 46（1）： 36⁃39.
17	中国轻工业联合会. 聚乙烯（PE）管材和管件热熔对接接头拉伸强度和破坏形式的测定：［S］. 北京：中国标准出版社， 2005.
18	中国轻工业联合会. 流体输送用热塑性塑料管道系统耐内压性能的测定：［S］. 北京：中国标准出版社， 2018.
19	中国石油和化学工业联合会. 塑料—试样状态调节和试验的标准环境：［S］. 北京：中国标准出版社， 2018.
20	中国石油和化学工业联合会. 热塑性塑料熔体质量流动速率和熔体体积流动速率的测定：［S］. 北京：中国标准出版社， 2018.
21	中国轻工总会. 聚乙烯管材与管件热稳定性试验方法：［S］. 北京：中国标准出版社， 1998.
22	中国石油和化学工业协会. 塑料—悬臂梁冲击强度的测定：［S］. 北京：中国标准出版社， 2008.
23	Plastics pipes and fittings⁃Butt fusion jointing procedures for polyethylene （PE） piping systems⁃Amendment 1：［S］. The international organization for standardization， 2017.
24	Polyethylene （PE） pipes and fittings⁃Determination of the tensile strength and failure mode of test pieces from a butt⁃fused joint： . ［S］. The international organization for standardization， 2001.
25	Standard Test Method for Laboratory Testing of Polyethylene （PE） Butt Fusion Joints using Tensile⁃Impact Method：［S］. American Society for Testing and Materials， 2020.
26	Thermoplastics pipes， fittings and assemblies for the conveyance of fluids ⁃ Determination of the resistance to internal pressure ⁃ Part 1： General method：［S］. The international organization for standardization， 2006.
27	阳代军，霍立兴，张玉凤. 聚乙烯管道热熔对接焊接头性能的分析［J］. 中国塑料， 2003， 17（2）： 75⁃79.
	YANG D J， HUO L X， ZHANG Y F. Analysis for welded joint performance of polyethylene pipes［J］. China Plastics， 2003， 17（2）： 75⁃79.
28	Anatoliy Galchun， Nikolay Korab， Volodymyr Kondratenko， et al. Nanostructurization and thermal properties of polyethylenes’ welds［J］. Nanoscale Research Letters， 2015， 10（1）： 138.
29	Azzeddine Belaziz， Mazari Mohamed. Experimental Study of the Weld Bead Zones of a High⁃Density Polyethylene Pipe （HDPE）［J］. J Fail. Anal. and Preven， 2018， 18（3）： 667⁃676.
30	Muhammad Shaheer， Mike Troughton， KhamsehnezhadAmir， et al. A study of the micro⁃mechanical properties of butt fusion⁃welded joints in HDPE pipes using the nanoindentation technique［J］. Weld World， 2017， 61（4）： 819⁃831.
31	EL⁃Bagory Tarek M A A， Hossam E M Sallam， Younan Maher Y A. Effect of strain rate， thickness， welding on the J–R curve for polyethylene pipe materials［J］. Theoretical and Applied Fracture Mechanics， 2014， 74： 164⁃180.
32	闵文. 含工艺缺陷PE管道热熔焊接接头失效机理分析［D］. 哈尔滨：哈尔滨理工大学， 2015.
33	Shim D J， Krishnaswamy P， Focht E. Comparison of parent and butt fusion material properties of high density polyethylene［C］. Proceedings of the ASME 2009 Pressure Vessels and Piping Division Conference. Prague， Czech Republic： ASMEDC， 2019： 1 301⁃1 308.
34	李孝三，漆宗能. 聚乙烯管材的开裂动力学与机理［J］. 高分子通报， 1992（4）： 218⁃227.
	LI X S， QI Z N. Cracking dynamics and mechanism of polyethylene pipe［J］. Polymer Bulletin， 1992（4）： 218⁃227.
35	LI H J， GAO B J， DONG J H， et al. Welding effect on crack growth behavior and life assessment of PE pipes［J］. Polymer Testing， 2016， 52： 24⁃32.
36	张建国，董俊华，高炳军，等.裂纹圆棒法测PE100管材热熔对接接头的抗慢速裂纹扩展性能［J］.机械工程材料，2017，41（9）：36⁃41.
	ZHANG J G， DONG J H， GAO B J， et al. SCG Resistance of butt⁃fusion joint of PE100 pipe tested by cracked round bar method［J］. Material of Mechanical Engineering， 2017， 41（9）： 36⁃41.
37	Krishnaswamy P， Shim D J， Kalyanam S. Comparison of parent and butt⁃fusion material properties of unimodal high⁃density polyethylene［J］. Journal of Pressure Vessel Technology， 2017， 139（4）： 1⁃7.
38	Standard Test Method for Notch Tensile Test to Measure the Resistance to Slow Crack Growth of Polyethylene Pipes and Resins：［S］. American Society for Testing and Materials， 2007.
39	Schmachtenberg E， Schoeche N. Advances in calculating thermally induced stresses in nonlinear viscoelastic materials［J］. Polymer Engineering and Science. 1999， 39（4）： 767⁃777.
40	王建平，霍立兴，谷侃锋. 塑料压力管道热板焊接接头瞬时应力有限元分析［J］. 焊接学报， 2006， 27（1）： 21⁃25，114.
	WANG J P， HUO L X， GU K F. Finite element analysis of instantaneous stress in hot plate welded joint of plastic pressure pipe［J］. Transactions of the China Welding Institution， 2006， 27（1）： 21⁃25，114.
41	谷侃锋. 高密度聚乙烯压力管道热板焊接接头应力场有限元模拟［D］. 天津：天津大学， 2003.
42	吕亚峰. 高密度聚乙烯管热熔焊接数值模拟研究［D］. 成都：西南石油大学， 2017.
43	李海梅，顾元宪，申长雨. 注塑件残余热应力的数值计算［J］. 化工学报， 2000， 51（3）： 308⁃312.
	LI H M， GU Y X， SHEN C Y. Numerical calculation of residual thermal stress of injection molded parts［J］. Journal of Chemical Industry and Engineering， 2000， 51（3）： 308⁃312.
44	李海梅，申长雨，顾元宪. 不均匀冷却对注塑件残余应力的影响［J］.中国塑料， 1999， 13（6）： 106⁃111.
	LI H M， SHEN C Y， GU Y X. Influence of uneven cooling on residual stress of injection molded parts［J］. China Plastics， 1999，13（6）：106⁃111.
45	Haward R N， Thackray R. The use of a mathematical model to describe isothermal stress⁃strain curves in glassy thermoplastics［J］. Proceedings of the Royal Society of London， Series A： Mathematical and Physical Sciences， 1968， 302（1471）： 453⁃472.
46	Argon A S. Physical basis of distortional and dilational plastic flow in glassy polymers［J］. Journal of Macromolecular Science， Part B， 1973， 8（3/4）： 573⁃596.
47	G′Sell C， Jonas J J. Determination of the plastic behaviour of solid polymers at constant true strain rate［J］. Journal of Materials Science， 1979， 14（3）： 583⁃591.
48	Hutchinson J W， Neale K W. Neck propagation［J］. Journal of the Mechanics and Physics of Solids， 1983， 31（5）： 405⁃426.
49	Neale K W， Tugcu P. Analysis of necking and neck pro⁃pagation in polymeric materials［J］. Journal of the Mechanics and Physics of Solids， 1985， 33（4）： 323⁃337.
50	Tugcu P， Neale K W. Analysis of plane⁃strain neck propagation in viscoplastic polymeric films［J］. International Journal of Mechanical Sciences， 1987， 29（12）： 793⁃805.
51	Neale K W， Tugcu P. Approximate methods for analysing the cold drawing of polymeric fibres and films［J］. International Journal for Numerical Methods in Engineering， 1988， 25（1）： 99⁃112.
52	Ogden R W. Large deformation isotropic elasticity： on the correlation of theory and experimental for compressible rubberlike solids［J］. Proceedings of the Royal Society of London， Series A： Mathematical and Physical Sciences， 1972， 328 （157）： 567⁃583.
53	Kwon H J， Jar Y B. On the application of FEM to deformation of high⁃density polyethylene［J］. International Journal of Solids and Structures， 2008， 45（11/12）： 3 521⁃3 543.
54	Sherwood J A， Frost C C. Constitutive modeling and simulation of energy absorbing polyurethane foam under impact loading［J］. Polymer Engineering&Science， 2010， 32（16）： 1 138⁃1 146.
55	马赛尔，许进升，童心，等. 高密度聚乙烯单轴拉伸力学性能及本构关系研究［J］. 中国塑料， 2016， 30（4）： 88⁃92.
	MA S E， XU J S， TONG X， et al. Research on uniaxially tensile mechanical properties and constitutive model of high density polyethylene［J］. China Plastics， 2016， 30（4）： 88⁃92.
56	赵兴民，赵建平，燕集中. 高密度聚乙烯管热熔焊接接头本构模型研究［J］. 中国塑料， 2021， 35（4）： 65⁃71.
	ZHAO X M， ZHAO J P， YAN J Z. Study on Constitutive model for butt fusion welded joint of high⁃density Polyethylene Pipe［J］. China Plastics， 2021， 35（4）： 65⁃71.
57	Krzysztof Wałęsa， Malujda Ireneusz， Górecki Jan，et al. The temperature distribution during heating in hot plate welding process［J］. MATEC Web of Conferences， 2019， 254： 02033.
58	Jan Poduška， Pavel Hutař， Jaroslav Kučera， et al. Residual stress in polyethylene pipes［J］. Polymer Testing， 2016， 54： 288⁃295.
59	L F A. DOUVEN， F P T BAAIJENST， H E H MEIJER. The computation of properties of injection⁃moulded products［J］. Progress in Polymer Science， 1995， 20（3）： 403⁃457.
60	Williams J G， Hodgkinson J M， Gray A. The determination of residual stresses in plastic pipe and their role in fracture［J］. Polymer Engineering & Science， 1981， 21（13）： 822⁃828.
61	Hutar P， Sevcik M， Frank A， et al. The effect of residual stress on polymer pipe lifetime［J］. Engineering Fracture Mechanics， 2013， 108： 98⁃108
62	Poduška J J， Kučera P， Hutař P， et al. Residual stress distribution in extruded polypropylene pipes［J］. Polymer Test， 2014， 40： 88⁃98.
63	王建平，霍立兴，谷侃锋. 高密度聚乙烯塑料压力管道热板焊接头应力分布有限元分析［J］. 压力容器， 2005（4）： 13⁃16，9.
	WANG J P， HUO L X， GU K F. Finite⁃element analyses on stresses distribution of hot⁃plate welded joint of high⁃density polyethylene plastic pressure pipes［J］. Pressure Vessel Technology， 2005（4）： 13⁃16，9.
64	Yu Sun， Jia Yun⁃Fei， Muhammad Haroon， et al. Welding residual stressin HDPE pipes： measurement and numerical simulation［J］. Journal of Pressure Vessel Technology， 2019，141（4）： 041404.
65	Ševčík M， Hutař P， Náhlík L. Crack behavior in a welded polyolefin pipe［J］. Mechanics of Composite Materials， 2011， 47（3）： 263⁃270.
66	Mikula J， Hutař P， Nezbedová E， et al. On crack propagation in the welded polyolefin pipes with and without the presence of weld beads［J］. Materials and Design，2015，87：95⁃104.
67	施建峰，冯颖，陶杨吉，等.聚乙烯管道无损检测技术标准进展［J］. 压力容器， 2021， 38（10）： 66⁃75.
	SHI J F， FENG Y， TAO Y J， et al. Advances in technical standards for non⁃destructive testing of polyethylene pipes［J］. Pressure Vessel Technology， 2021， 38（10）： 66⁃75.
68	XIA Fu⁃Yonga， LI Wei⁃ZHongb， LIU Yan⁃Leic. Research on ultrasonic testing technology for polyethylene pipe hot⁃melting welded joints［J］. Mechanics and Materials.2013，331：170⁃175.
69	Mike Troughton， Fredrik Hagglund. Development and Assessment of Ultrasonic Inspection System for Polyethylene Pipes［C］. Proceedings of the ASME 2013 Pressure Vessels and Piping Conference. Paris， France： American Society of Mechanical Engineers，2013，14⁃18.
70	施建峰，陶杨吉，安成名，等.聚乙烯燃气管道超声相控阵检测工程应用案例分析［J］. 压力容器， 2020， 37（12）： 54⁃62.
	SHI J F， TAO Y J， AN C M， et al. On⁃site phased array ultrasonic testing of polyethylene gas pipeline［J］. Pressure Vessel Technology， 2020， 37（12）： 54⁃62.
71	ZHENG Jinyang， ZHANG Yue， HOU Dongsheng， et al. A review of nondestructive examination technology for polyethylene pipe in nuclear power plant. Frontiers of Mechanical Engineering［J］. Frontiers of Mechanical Engineering， 2018， 13（4）： 535⁃545.
72	Robert Stakenborghs， Jack Little. Microwave Based NDE Inspection of HDPE Pipe Welds［C］. 17th International Conference on Nuclear Engineering. Brussels， Belgium： ASMEDC， 2009. 185⁃193.
73	祝新伟，潘金平，谭连江，等.微波扫描法检测聚乙烯管道热熔接头缺陷初探［J］. 压力容器， 2013， 30（2）： 73⁃76，21.
	ZHU X W， PAN J P， TAN L J， et al. Microwave scanning inspection of defects in thermo⁃fusion joints of polyethylene piping［J］. Pressure Vessel Technology， 2013， 30（2）： 73⁃76，21.
74	祝新伟，潘金平，谭连江. 聚乙烯管道热熔接头冷焊缺陷的微波检测和真密度测试研究［J］. 压力容器， 2013， 30（9）： 54⁃59.
	ZHU X W， PAN J P， TAN L J. Microwave inspection and true density measurement for cold weld defect in thermo⁃fusion welds of polyethylene piping［J］. Pressure Vessel Technology， 2013， 30（9）： 54⁃59.
75	Ken Murphy， David Lowe. Evaluation of a novel microwave based ndt inspection method for polyethylene joints［C］. ASME 2011 Pressure Vessels and Piping Conference. Baltimore， Maryland， USA： ASMEDC，2011. 321⁃327.
76	阳代军，霍立兴，张玉凤. 塑料压力管道焊接技术的发展现状［J］. 焊接技术， 2003（2）：3⁃7，1.
	YANG D J， HUO L X， ZHANG Y F. Current status of welding technology for plastic pressure pipes［J］. Welding Technology， 2003（2）： 3⁃7，1.

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[15]	ZHANG Xuemin, HOU Lin, FENG Jinmao, YAO Zhongliang, ZHONG Mingqiang. Study on natural aging behavior of buried polyethylene water supply pipeline in service [J]. China Plastics, 2022, 36(2): 49-55.