Our site uses cookies necessary for its proper functioning. To improve your experience, other cookies may be used: you can choose to disable them. This can be changed at any time via the Cookies link at the bottom of the page.


Development of an Automatic Test Procedure for Determining the Mechanical Properties of HM and HD Welds with Mechanized Torsional and Linear Shear Tests

 

Benjamin Baudrit, Dietmar Kraft, Martin Bastian and Peter Heidemeyer

Posters # 2010 Vancouver

In 2008, the Sueddeutsche Kunststoff-Zentrum (SKZ), a testing and R&D plastics institute based in Wuerzburg (Germany), began in cooperation with the company WIDOS, a welding machine manufacturer based in Ditzingen (Germany), to develop a testing device for establishing the mechanical properties of joints executed by means of sleeve welding with an incorporated heating element (HM) and heated tool sleeve welding (HD) with mechanized torsional and linear shear tests. The aims of this investigation were to generate a reproducible test procedure for HM and HD welds and to investigate its utilization suitability. The core statement of this research paper is that the mechanized torsional shear test (MTS) and the mechanized linear shear test (MLS) are very suitable for detecting defects in HM and HD joints. In addition to frequent and, in part, obviously incorrect preparations (wrong insertion lengths of the pipe into the sleeve, etc.), it was possible to detect defects which, with the naked eye or with manual radial peeling and manual torsional shear tests, could not be recognized at all (like e.g. oil in the joining area, double welding, etc.) or only with very great difficulty or/and with great experience. (1, 2) Initial pioneering evaluation algorithms were generated in addition to the development and elaboration of the testing apparatus for the mechanized torsional shear test and the mechanized linear shear test. These two tests currently represent the best way to determine the short-term quality of HM and HD weldings. These two testing methods could revolutionize the plastic pipe industry branch regarding developing, testing, improving and supervising products.

Please note that the whole article content is available on PPCA website only


Related papers

2021 Amsterdam : A TRADE ASSOCIATION EXPLORED

Author(s) : Drew Mueller, Peter Dyke

HDPE Pipe holds a dominant position in several markets in North America: natural gas distribution, oil patch, mining, landfill and geothermal. So why are polyethylene’s municipal water and wastewater market shares so much lower than these other industries? How has the polyethylene industry been successful in growing...

2021 Amsterdam : DESIGN OF A DISTRIBUTED STRAIN MONITORING SYSTEM FOR HDPE WATER PIPELINES CROSSING AN EARTHQUAKE FAULT

Author(s) : Peter Hubbard, Linqing Luo, Andrew Yeskoo, Kenichi Soga, Krista (Moita) Araica, Gus Cicala, Marshall McLeod

Seismically active faults pose a risk to buried water pipelines that can be complicated to quantify. Fault type, slip rate, pipeline geometry, and soil conditions all factor into a complex soil-pipeline interaction. For critical pipelines that cross faults, high-density polyethylene (HDPE) has become an attractive...

2021 Amsterdam : DESIGN OF LARGE DIAMETER BURIED PIPES

Author(s) : Anders Andtbacka, Peter Sejersen

In the late nineties a study of the behavior of buried thermoplastics pipes was carried out. The project had input and participants from both the plastic pipe industry as well as from external organizations. Six external leading experts in the field of pipeline design, not necessarily plastics pipes design, have been...

2021 Amsterdam : INSIGHTS ABOUT ENVIRONMENTAL PERFORMANCE OF CONCRETE PIPES

Author(s) : Peter Sejersen

Environmental Product Declarations of e.g. building products are to a large extent mandatory and we see that the European Union as well as individual Member States are implementing new regulation to secure sustainability in new buildings. The European Commission’s Product Environmental Footprint is one example and...

2021 Amsterdam : INVESTIGATION OF THE QUALITY CHARACTERISTICS OF POLYAMIDE 12 PIPE WELDS

Author(s) : M. Eckes & Dr. B. Baudrit, Dr. M. Troughton & D. Wylie, H. van Laak & J. Fritz

Unplasticized polyamide 12 (PA-U12) is increasingly being used in pipe applications, especially in the gas sector. However, the material behavior in the usual quality tests for pipe welds has not yet been thoroughly investigated. For this reason, two research institutes, worked in cooperation with a manufacturer of...

2021 Amsterdam : LONG-TERM DURABILITY OF NEW POLYMER COMPOSITE VALVES FOR DRINKING WATER NETWORKS

Author(s) : Jennifer Ravereau, Jose Teixeira Pinto, Malena Bernabeu, Jose Alacid, Jean-Philippe Le Goff, Frederic Mohier, Benjamin Rabaud

Drinking water network fittings such as valves are made of brass materials known to be robust over long periods. Due to the gradual inflation metallic raw material costs, composite plastic valves have grown in market share. Uncertainties remain, however, on their long-term reliability. The aim of this work is to...

2021 Amsterdam : MUTUAL RECOGNITION OF THE CERTIFICAT ION SCHEMES IN EUROPE

Author(s) : Horst Stimmelmayr, Peter Sejersen

The voluntary certification scheme for plastic multilayer piping systems for hot and cold drinking water inside buildings is a joint effort of two key European organizations. It was initiated in close cooperation with the Brussels based European trade association of plastic pipe and fittings manufacturers, TEPPFA....

2021 Amsterdam : RECYCLING COMMITMENT OF THE EUROPEAN PLASTIC PIPE INDUSTRY

Author(s) : Ludo Debever, Peter Sejersen

The European Plastics Strategy is a priority for the European Union. Recycling more post- consumer plastics (PCRs) is paramount. That is why the Circular Plastics Alliance has been established. The alliance gathers public and private stakeholders in the plastics value chains to promote voluntary actions and...

2021 Amsterdam : SLOW CRACK GROWTH RESISTANCE OF REPROCESSED PVC

Author(s) : Andreas Frank, Mario Messiha, Günter Dreiling, Norbert Schuler, Jens-Martin Storheil, Erwin Mayrbäurl, Stuart Ramella, Frank Krause, Rudi Berning, Philippe Gabriëls, Alpay Aydemir, Thomas Koch, Florian Arbeiter, Gerald Pinter

The Cyclic Cracked Round Bar (CRB) Test has been applied to study the slow crack growth (SCG) resistance of virgin, recycled, and reprocessed PVC-U. This fracture mechanical test allows a quick ranking of the SCG resistance of PVC-U. A clear correlation between the K-value and the SCG resistance has been elaborated....

2021 Amsterdam : TESTING SPOOLABLE REINFORCED FLEXIBLE PIPES AND LINER MATERIAL FOR HIGH-PRESSURE HYDROGEN TRANSPORT

Author(s) : Sjoerd Jansma, Peter Cloos, Ernst van der Stok

This paper describes two different test methods used to determine the permeation rate of hydrogen through a reinforced thermoplastic pipe (RTP) system with a HDPE liner pipe and a gas-tight layer at a pressure of 42 bar(g) hydrogen and ambient temperature. One method involThe results of the aforementioned tests...

2018 Las-Vegas : Design of large diameter buried pipes

Author(s) : Anders Andtbacka, Frans Alferink, Peter Sejersen

The behavior of buried plastic pipes is already well described in standards and technical specifications and as well as proven in real life conditions. Plastics pipes in diameters up to around 400 mm are already in use for more than 60 years and pipes with larger diameters for more than 20 years now. All with good...

2018 Las-Vegas : Harmonizing the european hygienic requirements

Author(s) : Ilari Aho, Volker Meyer, Peter Sejersen

The lack of a cross-border acceptance of the approval of the hygienic requirements for plastic pipes systems is inefficient and expensive for the industry. The costs for testing of a pipe system range from a few thousand Euro to more than €30k /reference 3, 4/. The European Plastic Pipe and Fitting Association...

2018 Las-Vegas : HDPE Pipe as a Solution to Utilities Operating on a Manage to Fail Basis

Author(s) : Sarah Eisenstat, Peter Dyke

Many cities in the US are operating their water utility on a “manage to fail” basis, meaning they are replacing >100-year-old pipes at a cycle time of over 150 years. At this rate, most of the pipes will have failed before they can be replaced. Ft. Wayne, IN made the realization that PE pipe is the solution due to its...

2018 Las-Vegas : Large pressure pipe system – Fully PE100

Author(s) : Sverre Tragethon, Martin Andersson

Global mega trends push for investments in sewage treatment capacity & efficiency. A trend is to go for central regional treatment sites, typically remotely located from dense populated cities. This calls for high capacity pressure sewage transmission pipelines. Reliable operation is of course of paramount importance...

2018 Las-Vegas : New en standard for infiltration units

Author(s) : Peter Verlaan

Ten years ago, The European Plastic Pipes and Fittings Association (TEPPFA) has taken the initiative to prepare a draft 'Standard for Infiltration units' based on existing national specifications, at that time (in particular) available in France, Germany, United Kingdom and the Netherlands. This draft 'Standard for...

2018 Las-Vegas : Product environmental footprint (PEF) method compared with environmental product declarations (EPDS)

Author(s) : Ludo Debever, Peter Sejersen, Carolin Spirinckx

Until today there are various ways of demonstrating the Environmental Performance of products, such as Life Cycle Assessments (LCA), Life Cycle Impact Assessments (LCIA), Environmental Performance Declarations (EPDs). The methods to obtain the result, however, can vary from country to country and can be interpreted...

2018 Las-Vegas : Quality assurance on welded joints with the mechanised linear shear test (lst)

Author(s) : Juergen Wuest, Benjamin Baudrit, Frank Dorbath, Christopher Pommer

A testing apparatus for determining the mechanical properties of electrofusion and heated tool sleeve welded joints with the mechanized linear shear test (LST) was developed. The LST-apparatus allows the recording of the force as a function of the extension / shear length. It has been proved that the linear shear test...

2018 Las-Vegas : Slow crack growth resistance of non-virgin polymers

Author(s) : Andreas Frank, Isabelle J. Berger, Mario Messiha, Carl-Gustaf Ek, Norbert Schuler, Jens-Martin Storheil, Erwin Mayrbäurl, Steve Heeley, Frank Krause, Lodewijk Niemöller, Philippe Gabriëls, Yogesh S. Deshmukh, Florian Arbeiter, Thomas Koch, Gerald Pinter

In order to improve the circular economy of polymers in terms of sustainability and reduced carbon footprint, the increased use of recyclates has become a topic of major importance. Due to their long design lifetimes, pipe applications represent an excellent opportunity to create added value to non-virgin polymers. In...

2018 Las-Vegas : Squeeze-off and rerounding of plastic pressure pipes

Author(s) : Juergen Wuest, Mirko Wenzel, Andreas Bilsing, Peter Postma, Werner Wessing

Within the scope of a DVGW (German Technical and Scientific Association for Gas and Water) research project the technology of squeezing-off for PE pipes at operating pressures higher than 1 bar and the extension to new materials with higher operating pressures were investigated. For this purpose the tightness of the...

2016 Berlin : A combination of accelerated test methods to evaluate new generation resins for disinfectant- resistant polyethylene pipes

Author(s) : Francis Reny Costa, Anh Tuan Tran, Jeroen Oderkerk, Thomas Hjertberg, Christophe Salles, Ulf W. Gedde, Benjamin Rabaud, Flavia Zraick

The premature failure of polyethylene pipes in contact with high chlorine and chlorine dioxide, used as residual disinfectants in drinking water distribution, remains an area of concern for water companies particularly in regions where temperatures are regularly or seasonally high. Multiple factors can amplify the...

Members of the Association

BOREALISBOROUGEFormosa Plastics CorporationINEOS O&PIRPCKazanorgsintez PJSCKorea Petrochemical IND. Co., LTD (KPIC)LyondellBasellPetroChina Dushanzi Petrochemical CompanyPRIME POLYMERSABICSCG Chemicals & Thai PolyethyleneSinopecTASNEE
TOP