1、January 2013 Translation by DIN-Sprachendienst.English price group 11No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).IC
2、S 25.160.40!$“1936192www.din.deDDIN EN 16296Imperfections in thermoplastics welded joints Quality levels;English version EN 16296:2012,English translation of DIN EN 16296:2013-01Unregelmigkeiten an Schweiverbindungen von thermoplastischen Kunststoffen Qualittsstufen;Englische Fassung EN 16296:2012,E
3、nglische bersetzung von DIN EN 16296:2013-01Dfauts dans les assemblages souds en thermoplastiques Niveaux de qualit;Version anglaise EN 16296:2012,Traduction anglaise de DIN EN 16296:2013-01www.beuth.deDocument comprises 20 pagesIn case of doubt, the German-language original shall be considered auth
4、oritative.12.12 DIN EN 16296:2013-01 2 A comma is used as the decimal marker. National foreword This standard has been prepared by Technical Committee CEN/TC 249 “Plastics” (Secretariat: NBN, Belgium). The responsible German body involved in its preparation was the Normenausschuss Kunststoffe (Plast
5、ics Standards Committee), Working Committee NA 054-05-12 AA Fgen von Kunststoffen. EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 16296 October 2012 ICS 25.160.40 English Version Imperfections in thermoplastics welded joints - Quality levels Dfauts dans les assemblages souds en thermoplastique
6、s - Niveaux de qualit Unregelmigkeiten an Schweiverbindungen von thermoplastischen Kunststoffen - Qualittsstufen This European Standard was approved by CEN on 22 September 2012. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this E
7、uropean Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official vers
8、ions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria,
9、 Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, S
10、witzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Member
11、s. Ref. No. EN 16296:2012: EEN 16296:2012 (E) 2 Contents Page Foreword . 3Introduction 41 Scope . 52 Normative reference . 63 Terms and definitions 64 Quality levels. 64.1 Classification . 64.2 Choice of quality level 75 Requirements for welded joints 7Bibliography . 18DIN EN 16296:2013-01 EN 16296:
12、2012 (E) 3 Foreword This document (EN 16296:2012) has been prepared by Technical Committee CEN/TC 249 “Plastics”, the secretariat of which is held by NBN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the lat
13、est by April 2013, and conflicting national standards shall be withdrawn at the latest by April 2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such
14、 patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedo
15、nia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. DIN EN 16296:2013-01 EN 16296:2012 (E) 4 Introduction This European Sta
16、ndard should be used as a reference in drafting of application codes and/or other application standards. It contains a simplified selection of imperfections based on the designations given in EN 14728, Imperfections in thermoplastic welds Classification. Some imperfections according to EN 14728 have
17、 been used directly and some have been grouped together. The basic numerical referencing system from EN 14728 has been used. The purpose of this standard is to define quality levels based on typical imperfections, which might occur in normal fabrication. It may be used within a quality system for th
18、e production of factory welded joints. It provides three sets of dimensional values from which a selection can be made for a particular application. The quality level necessary in each case should be defined by the application standard or the fabricator in conjunction with the user and/or other part
19、ies concerned. The level should be prescribed before the start of production, preferably at the enquiry or order stage. The quality levels given in this standard are intended to provide basic reference data and are not specifically related to any particular application. They refer to the types of we
20、lded joints in a fabrication and not to the complete product or component itself. It is possible, therefore, that different quality levels are applied to individual welded joints in the same product or component. The choice of quality level for any application should take account of design considera
21、tions, subsequent processing, mode of stressing (e.g. static, dynamic), service conditions (e.g. pressure, temperature, environment) and consequences of failure. Economic factors are also important and should include not only the cost of welding but also of inspection, test and repair. Although this
22、 European Standard includes types of imperfections relevant to the processes given in Clause 1, only those which are applicable to the process and application in question need to be considered. Imperfections are quoted in terms of their actual dimensions. However their detection and evaluation may r
23、equire the use of one or more methods of non-destructive testing. It should be noted that the detection and sizing of imperfections is dependent on the inspection methods and the extent of testing specified in the application standard or contract. The need for detection is not the subject of this st
24、andard. This European Standard is directly applicable to visual examination of welds or test specimens. It does not include details of recommended methods of detection and sizing. The indication provided by non-destructive testing should not be used directly for the evaluation of quality levels. The
25、refore, it needs to be supplemented by requirements for examinations, inspection and testing. DIN EN 16296:2013-01 EN 16296:2012 (E) 5 1 Scope This European Standard provides quality levels for imperfections in thermoplastics welded joints. It applies to material thickness above 2,0 mm. Three qualit
26、y levels are given in order to permit application for a wide range of welded fabrication. They are designated by symbols B, C and D, where B is the most stringent. The quality levels refer to production quality and not to the fitness-for-purpose (see 3.2) of the manufactured product. This European S
27、tandard applies to the following thermoplastic materials: Table 1 Abbreviation Material description ABS Acrylonitrile-butadiene-styrene plastic ECTFE Ethylene-chlorotrifluoroethylene copolymer FEP Fluorinated ethylene propylene PB Polybutylene PE Polyethylene PFA Perfluoroalkoxy PP-B Polypropylene b
28、lock copolymer PP-H Polypropylene homopolymer PP-R Polypropylene random copolymer PVC-C Chlorinated polyvinyl chloride PVC-U Unplasticised polyvinyl chloride (rigid PVC) PVDF Polyvinylidene fluoride and to the following welding processes: Heated tool welding; Electrofusion welding; Hot gas welding u
29、sing filler rod only; Extrusion welding; DIN EN 16296:2013-01 EN 16296:2012 (E) 6 Solvent welding of pipes. 2 Normative reference The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the editio
30、n cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 14728, Imperfections in thermoplastic welds Classification 3 Terms and definitions For the purposes of this document, the following terms and definitions apply 3.1 quality le
31、vel description of the qualities of a weld on the basis of type and size of selected imperfections 3.2 fitness-for-purpose ability of a product, process or service to serve a defined purpose under specific conditions 4 Quality levels 4.1 Classification Three quality levels are defined as B, C and D
32、in order to permit application for a wide range of welded fabrications (see Table 2). Table 2 Quality levels for weld imperfections Symbol Requirement B Stringent C IntermediateD Moderate The purpose of this standard is to define quality levels based on typical imperfections, which might occur in no
33、rmal fabrications and are classified in EN 14728. It may be used within a quality system for the production of factory welded joints. It provides three sets of dimensional values from which a selection can be made for a particular application. The quality level necessary in each case should be defin
34、ed by the application standard or the fabricator in conjunction with the user and/or other parties concerned. The level should be prescribed before the start of production, preferably at the enquiry or order stage. For specific applications, additional requirements not covered by this standard may n
35、eed to be prescribed. These additional requirements shall be defined as quality level A. DIN EN 16296:2013-01 EN 16296:2012 (E) 7 4.2 Choice of quality level For the choice of the quality level, the following factors, among others, shall be taken into account: mechanical loading (static, dynamic); e
36、nvironment (media, temperature); material properties (ductile, brittle); manufacturing conditions (workshop, construction site, welding in constrained condition); operating conditions; potential danger in the event of failure. 5 Requirements for welded joints The requirements for the above mentioned
37、 quality levels (B, C and D) are listed as follows: Heated tool butt welds: Table 3; Heated tool socket welds: Table 4; Electrofusion welds: Table 5; Hot gas welds: Table 6; Extrusion welds: Table 7; Solvent welds in pipes: Table 8. Different types of imperfection occurring simultaneously at any cro
38、ss-section of the joint may need special consideration and advice should be sought from the product manufacturer. Any two adjacent imperfections separated by a distance smaller than the major dimension of the smaller imperfection shall be considered as a single imperfection. In certain circumstances
39、, it is necessary to machine the completed weld. In this case, the weld shall be examined both before and after machining. DIN EN 16296:2013-01 EN 16296:2012 (E) 8 Table 3 Definition of quality levels for heated tool butt welds Number Designations Level B Level C Level D 1AAAA Cracks Not permissible
40、 Not permissible Not permissible 2BAAA Gas cavity Isolated cavities permissible if diameter 5 % of wall thickness Permissible if diameter of largest cavity 10 % of wall thickness Permissible if diameter of largest cavity 15 % of wall thickness 2CAAA Shrinkage cavity Isolated cavities permissible if
41、diameter 5 % of wall thickness Permissible if diameter of largest cavity 10 % of wall thickness Permissible if diameter of largest cavity 15 % of wall thickness 2DAAA Craze Not permissible Not permissible Not permissible 3AAAA Inclusion Isolated inclusion permissible if maximum dimension 5 % of wall
42、 thickness Isolated and rows of inclusions permissible if maximum dimension 10 % of wall thickness Isolated and rows of inclusions permissible if maximum dimension 15 % of wall thickness 3KAAA Degraded polymer Not permissible Not permissible Not permissible 4BAAA Lack of fusion Not permissible Not p
43、ermissibleNot permissible 5AAAA Imperfect shape Mechanical testing of sample welds is recommended Mechanical testing of sample welds is recommended Mechanical testing of sample welds is recommended 5EJAA Linear misalignment Permissible if misalignment is not greater than 10 % of the wall thickness P
44、ermissible if misalignment is not greater than 15 % of the wall thickness Permissible if misalignment is not greater than 20 % of the wall thickness 5EKAA Angular misalignment Permissible if misalignment is not greater than 0,2 Permissible if misalignment is not greater than 0,4 Permissible if misal
45、ignment is not greater than 0,8 5HAAA Irregular surface Not permissible Not permissible Not permissible 6EAAA Excessive upset Not permissible Not permissible Not permissible 6HAAA 6HAAC Excessive asymmetry of welds Permissible if smaller half of weld bead is not less than 70 % of Permissible if smal
46、ler half of weld bead is not less than 60 % of Permissible if smaller half of weld bead is not less than 50 % of DIN EN 16296:2013-01 EN 16296:2012 (E) 9 Number Designations Level B Level C Level D larger half of weld bead around the whole circumference larger half of weld bead around the whole circ
47、umference larger half of weld bead around the whole circumference 7BAAA Thermal damage Not permissible Not permissible Not permissible 9CAAA Tool mark Locally permissible if bottom of notch is not acute and the notch depth is less than 10 % of the wall thickness and not greater than 0,5 mm Locally p
48、ermissible if bottom of notch is not acute and the notch depth is less than 10 % of the wall thickness and not greater than 1,0 mm Locally permissible if bottom of notch is not acute and the notch depth is less than 15 % of the wall thickness and not greater than 2,0 mm NOTE The data in this table can also be found in DVS 2202-1 1. DIN EN 16296:2013-01 EN 16296:2012 (E) 10 Table 4 Definition of quality levels for heated tool socket welds Num
