SIST EN 12814-2:2021

Testing of welded joints of thermoplastics semi-finished products - Part 2: Tensile test

This document specifies the dimensions, the method of sampling, the preparation of the test specimens and the conditions for performing the tensile test in order to determine the short-term tensile welding factor.
A tensile test can be used in conjunction with other tests (e.g. bend, tensile creep, macro) to assess the performance of welded assemblies, made from thermoplastics materials.
The test is applicable to welded semi-finished products made from thermoplastics materials filled or unfilled, but not reinforced, irrespective of the welding process used.

Prüfen von Schweißverbindungen aus thermoplastischen Kunststoffen - Teil 2: Zugversuch

Dieses Dokument legt Maße, Probenahmeverfahren und Vorbereitung der Proben sowie die Durchführungs-bestimmungen für den Zugversuch fest, um den Kurzzeitzug-Schweißfaktor zu bestimmen.
Ein Zugversuch kann in Verbindung mit anderen Prüfungen (z. B. Biegeversuch, Zeitstand-Zugversuch, makroskopische Prüfung) angewendet werden, um das Betriebsverhalten von Schweißverbindungen aus thermoplastischen Kunststoffen zu beurteilen.
Der Zugversuch ist unabhängig vom angewendeten Schweißverfahren anwendbar auf geschweißte Halbzeuge, die aus gefüllten oder ungefüllten, nicht aber aus verstärkten thermoplastischen Kunststoffen bestehen.

Essais des assemblages soudés sur produits semi-finis en thermoplastiques - Partie 2 : Essai de traction

Le présent document spécifie les dimensions, la méthode d'échantillonnage et la préparation des éprouvettes, ainsi que les conditions pour effectuer l'essai de traction afin de déterminer le facteur de soudage à court terme en traction.
Un essai de traction peut être utilisé en combinaison avec d'autres essais (par exemple : essai de pliage, essai de fluage en traction, examen macrographique, etc.) pour évaluer les performances des assemblages soudés en matières thermoplastiques.
L’essai est applicable à des produits semi-finis soudés composés de matières thermoplastiques chargées ou non chargées, mais non renforcées, quel que soit le procédé de soudage utilisé.

Preskušanje zvarjenih spojev plastomernih polizdelkov - 2. del: Trgalni preskus

General Information

• Status: Published
• Public Enquiry End Date: 30-Sep-2019
• Publication Date: 04-Feb-2021
• ICS: 25.160.40 - Welded joints and welds
• ICS: 83.080.01 - Plastics in general
• Technical Committee: IPMA - Polimer materials and products
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 04-Feb-2021
• Due Date: 11-Apr-2021
• Completion Date: 05-Feb-2021
• Ref Project: EN 12814-2:2021 - Testing of welded joints of thermoplastics semi-finished products - Part 2: Tensile test

Relations

• Replaces: SIST EN 12814-2:2000 - Testing of welded joints of thermoplastics semi-finished products - Part 2: Tensile test
• Effective Date: 03-Feb-2021
• Revised: SIST EN 12814-2:2000 - Testing of welded joints of thermoplastics semi-finished products - Part 2: Tensile test
• Effective Date: 07-Nov-2018

Overview

EN 12814-2:2021 - Testing of welded joints of thermoplastics semi-finished products, Part 2: Tensile test - is a CEN standard that specifies how to prepare, sample and carry out tensile testing to determine the short‑term tensile welding factor of welded thermoplastic semi‑finished products. Applicable to filled or unfilled (but not reinforced) thermoplastics, the standard covers specimen geometries, sampling rules, test conditions and result reporting for welded assemblies irrespective of the welding process used.

Key topics and requirements

• Scope: Determines the short‑term tensile welding factor (fs) for welded joints of thermoplastics semi‑finished products (tubular and flat assemblies).
• Specimen types: Defines Type 1 and Type 2 specimen geometries for flat and tubular assemblies; includes an informative Annex A for overlap joints and a normative Annex C for notched tensile specimens to force weld failure.
• Sampling & preparation:
  • Cut specimens perpendicular to the weld at least 8 hours after welding.
  • Mark original specimen positions; avoid heat treatment or mechanical straightening.
  • Leave or remove weld beads according to in‑service practice.
• Test conditions:
  • Condition specimens to 23 ± 2 °C; test at nominal room temperature (~23 °C) with specified tolerances.
  • Crosshead/test speed selection per EN ISO 527‑1; choose speed so tests finish in about one minute.
  • Recommended example speeds (Annex B): PVC 10 mm/min; PVDF, PP‑H, PP‑B 20 mm/min; PE, PP‑R 50 mm/min.
• Statistics & evaluation:
  • Minimum of five welded and five unwelded specimens (at least ten specimens in evaluation).
  • Short‑term tensile welding factor: fs = σw / σr (mean welded stress divided by mean unwelded stress). If unwelded strength is exceeded outside the weld, fs = 1.
• Equipment & standards: Test machines must comply with ISO 5893; cutting and visual inspection per EN 13100‑1.

Applications and users

• Who uses it: Materials and component manufacturers, welding qualification labs, quality control and R&D teams, fabricators of pipes/fittings and other thermoplastic assemblies, and certification bodies.
• Practical uses:
  • Qualify welding procedures and personnel.
  • Compare welded joint performance against base material.
  • Support failure analysis and process optimization (together with bend, tensile creep, macro tests).
  • Validate manufacturing changes or new thermoplastic grades.

Related standards

• EN 13100‑1 - Visual examination of thermoplastic welded joints
• EN ISO 527‑1 - Tensile properties of plastics (general principles)
• ISO 5893 - Test equipment specification
• ISO 13953 - Tensile strength of butt‑fused joints (referenced methods)
• EN 13067 - Qualification of welders for thermoplastics

EN 12814-2:2021 is essential for consistent, reproducible tensile testing of thermoplastic welded joints and provides the technical basis for evaluating weld quality through measurable tensile performance.

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2021
Nadomešča:
SIST EN 12814-2:2000
Preskušanje zvarjenih spojev plastomernih polizdelkov - 2. del: Trgalni preskus
Testing of welded joints of thermoplastics semi-finished products - Part 2: Tensile test
Prüfen von Schweißverbindungen aus thermoplastischen Kunststoffen - Teil 2:
Zugversuch
Essais des assemblages soudés sur produits semi-finis en thermoplastiques - Partie 2 :
Essai de traction
Ta slovenski standard je istoveten z: EN 12814-2:2021
ICS:
25.160.40 Varjeni spoji in vari Welded joints and welds
83.080.01 Polimerni materiali na Plastics in general
splošno
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 12814-2
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2021
EUROPÄISCHE NORM
ICS 25.160.40 Supersedes EN 12814-2:2000
English Version
Testing of welded joints of thermoplastics semi-finished
products - Part 2: Tensile test
Essais des assemblages soudés sur produits semi-finis Prüfen von Schweißverbindungen aus
en thermoplastiques - Partie 2 : Essai de traction thermoplastischen Kunststoffen - Teil 2: Zugversuch
This European Standard was approved by CEN on 20 December 2020.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12814-2:2021 E
worldwide for CEN national Members.

Contents Page
European foreword .3
1 Scope .4
2 Normative references .4
3 Terms, definitions, symbols and abbreviated terms .4
3.1 Terms and definitions .4
3.2 Symbols and abbreviated terms .4
4 Principle of the test .5
5 Sampling procedures .5
6 Dimensions of test specimens .6
7 Cutting of test specimens .8
8 Mechanical testing .8
9 Test equipment .8
10 Determination of the short-term tensile welding factor .8
11 Test report .9
Annex A (informative) Tensile test specimen for overlap joints . 11
Annex B (informative) Recommended test speeds for some thermoplastics materials . 12
Annex C (normative) Notched tensile test specimen . 13
Bibliography . 14

European foreword
This document (EN 12814-2:2021) 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 July 2021, and conflicting national standards shall be withdrawn at
the latest by July 2021.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 12814-2:2000.
In comparison with the previous edition, the following technical modifications have been made:
— the reference standards ISO 5893 and ISO 13953 have been changed to undated;
— a new annex (Annex A), describing the tensile test specimen geometry for overlap joints, has been
added.
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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United
Kingdom.
1 Scope
This document specifies the dimensions, the method of sampling, the preparation of the test specimens and
the conditions for performing the tensile test in order to determine the short-term tensile welding factor.
A tensile test can be used in conjunction with other tests (e.g. bend, tensile creep, macro) to assess the
performance of welded assemblies, made from thermoplastics materials.
The test is applicable to welded semi-finished products made from thermoplastics materials filled or
unfilled, but not reinforced, irrespective of the welding process used.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
EN 13100-1, Non destructive testing of welded joints of thermoplastics semi-finished products - Part 1: Visual
examination
EN ISO 527-1, Plastics - Determination of tensile properties - Part 1: General principles (ISO 527-1)
ISO 5893, Rubber and plastics test equipment - Tensile, flexural and compression types (constant rate of
traverse) - Specification
ISO 13953, Polyethylene (PE) pipes and fittings - Determinationof the tensile strength of test specimens from
a butt-fused joint
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.2 Symbols and abbreviated terms
For the purposes of this document, the symbols and abbreviated terms given in Table 1 apply.

Table 1 — Symbols and abbreviated terms
Symbols and Designations Units
abbreviated
term
a Minimum measured thickness of the test mm
specimen within calibrated and parallel length
a Nominal thickness of the test piece mm
n
b Width of calibrated and parallel length of the test mm
specimen
b Width of shoulder of the test specimen mm
Dn Nominal outside diameter of the tube mm
F The value of force of the unwelded test N
r
specimens taken from the
...