SIST EN 16296:2014
(Main)Imperfections in thermoplastics welded joints - Quality levels
Imperfections in thermoplastics welded joints - Quality levels
This European Standard provides quality levels for imperfections in thermoplastics welded joints. It applies to material thickness above 2,0 mm. Three quality 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) of the manufactured product. This European Standard applies to the following thermoplastic materials: and to the following welding processes: - Heated tool welding; - Electrofusion welding; - Hot gas welding using filler rod only; - Extrusion welding; - Solvent welding of pipes.
Unregelmäßigkeiten an Schweißverbindungen von thermoplastischen Kunststoffen - Qualitätsstufen
Diese Europäische Norm legt Qualitätsstufen für Unregelmäßigkeiten an Schweißverbindungen von thermoplastischen Kunststoffen fest. Sie gilt für Materialdicken über 2,0 mm.
Um eine Anwendung an eine große Auswahl von Schweißerzeugnissen zu ermöglichen, sind drei Qualitäts-stufen festgelegt. Diese sind durch Symbole B, C und D gekennzeichnet, wobei B die höchste Qualitätsstufe ist. Die Qualitätsstufen beziehen sich auf die Fertigungsqualität und nicht auf die Gebrauchstauglichkeit (siehe 3.2) des hergestellten Produkts.
Diese Norm gilt für folgende thermoplastische Materialien:
und folgende Schweißverfahren:
- Heizelementschweißen;
- Heizwendelschweißen;
- Warmgasschweißen, ausschließlich unter Anwendung von Schweißstab;
- Extrusionsschweißen;
- Quellschweißen von Rohren.
Défauts dans les assemblages soudés en thermoplastiques - Niveaux de qualité
La présente Norme européenne propose des niveaux de qualité pour évaluer les défauts des assemblages
soudés en thermoplastiques. Elle s'applique aux matériaux présentant une épaisseur supérieure à 2,0 mm.
La présente Norme propose trois niveaux de qualité, afin de permettre son application à un vaste éventail
d'assemblages soudés. Ils sont désignés par les symboles B, C et D, B étant le niveau le plus contraignant.
Les niveaux de qualité s'appliquent à la qualité de la production et non pas à l'aptitude à l'emploi (voir 3.2) du
produit fabriqué.
La présente Norme s'applique aux matériaux thermoplastiques suivants :
Abréviation Description du matériau
ABS Acrylonitrile butadiène styrène
ECTFE Éthylène chlorotrifluoroéthylène
FEP Éthylène-propylène fluoré
PB Polybutène
PE Polyéthylène
PFA Perfluoroalkoxy
PP-B Copolymère bloc du polypropylène
PP-H Polypropylène homopolymère
PP-R Copolymère statistique du polypropylène
PVC-C Poly(chlorure de vinyle) chloré
PVC-U Poly(chlorure de vinyle) non plastifié (PVC rigide)
PVDF Poly(fluorure de vinylidène)
et aux procédés de soudage suivants :
⎯ soudage par outil chauffant ;
⎯ électrosoudage ;
⎯ soudage au gaz chaud avec baguette d’apport uniquement ;
⎯ soudage par extrusion ;
Nepravilnosti v zvarjenih spojih plastomerov - Stopnje kakovosti
Ta evropski standard opisuje stopnje kakovosti nepravilnosti v zvarjenih spojih plastomerov. Velja za debelino materiala nad 2,0 mm. Za uporabo širokega nabora varjenih izdelkov so določene tri stopnje kakovosti. Označene so s simboli B, C in D, pri čemer je B najstrožji. Stopnje kakovosti se nanašajo na kakovost izdelave in ne na primernost za namen proizvedenega izdelka. Ta evropski standard velja za naslednje plastomere in postopke varjenja: – varjenje z vročim zrakom; – elektrofuzijsko varjenje; – varjenje z vročimi ploščami z uporabo varilnih elektrod; – ekstrudersko varjenje; – varjenje cevi s topilom.
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Nepravilnosti v zvarjenih spojih plastomerov - Stopnje kakovostiUnregelmäßigkeiten an Schweißverbindungen von thermoplastischen Kunststoffen - QualitätsstufenDéfauts dans les assemblages soudés en thermoplastiques - Niveaux de qualitéImperfections in thermoplastics welded joints - Quality levels83.080.20PlastomeriThermoplastic materials25.160.40Varjeni spoji in variWelded jointsICS:Ta slovenski standard je istoveten z:EN 16296:2012SIST EN 16296:2014en,fr,de01-maj-2014SIST EN 16296:2014SLOVENSKI
STANDARD
SIST EN 16296:2014
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 16296
October 2012 ICS 25.160.40 English Version
Imperfections in thermoplastics welded joints - Quality levels
Défauts dans les assemblages soudés en thermoplastiques - Niveaux de qualité
Unregelmäßigkeiten an Schweißverbindungen von thermoplastischen Kunststoffen - Qualitätsstufen 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 European 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 versions (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, 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, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR 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 Members. Ref. No. EN 16296:2012: ESIST EN 16296:2014
EN 16296:2012 (E) 2 Contents Page Foreword . 3Introduction . 41Scope . 52Normative reference . 63Terms and definitions . 64Quality levels. 64.1Classification . 64.2Choice of quality level . 75Requirements for welded joints . 7Bibliography . 18 SIST EN 16296:2014
EN 16296:2012 (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 latest 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 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 Macedonia, 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. SIST EN 16296:2014
EN 16296:2012 (E) 4 Introduction This European Standard 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 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 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 defined 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.
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 welded 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 considerations, 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 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 require 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 standard. 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. Therefore, it needs to be supplemented by requirements for examinations, inspection and testing.
SIST EN 16296:2014
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 quality 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 Standard 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 block 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 using filler rod only; Extrusion welding; SIST EN 16296:2014
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 edition 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 level 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 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 Intermediate D Moderate
The purpose of this standard is to define quality levels based on typical imperfections, which might occur in normal 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 defined 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 need to be prescribed. These additional requirements shall be defined as quality level A. SIST EN 16296:2014
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); environment (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 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 cross-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, it is necessary to machine the completed weld. In this case, the weld shall be examined both before and after machining.
SIST EN 16296:2014
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 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
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 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 permissible
Not 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 Permissible 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 misalignment 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 smaller half of weld bead is not less than 60 % of Permissible if smaller half of weld bead is not less than 50 % of SIST EN 16296:2014
EN 16296:2012 (E) 9 Number Designat
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