prEN 12814-2

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 an Halbzeugen aus thermoplastischen Kunststoffen - Teil 2: Zugversuch

Dieses Dokument legt die Maße, das Probenahmeverfahren und die Vorbereitung der Proben sowie die Bedingungen für die Durchführung des Zugversuchs 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 verwendeten 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: Natezni preskus

Ta dokument določa dimenzije, metodo vzorčenja, pripravo preizkušancev in pogoje za izvedbo nateznega preizkusa z namenom določanja kratkoročnega nateznega varilnega faktorja.
Natezni preizkus se lahko uporablja skupaj z drugimi preizkusi (npr. upogibni, natezna lezenja, makro) za oceno zmogljivosti varjenih sklopov, izdelanih iz termoplastičnih materialov.
Preizkus je uporaben za varjene polizdelke, izdelane iz termoplastičnih materialov, polnjenih ali nepolnjenih, vendar ne ojačanih, ne glede na uporabljeni varilni postopek.

General Information

• Status: Not Published
• Publication Date: 07-Oct-2027
• ICS: 25.160.40 - Welded joints and welds
• Technical Committee: CEN/TC 249 - Plastics
• Drafting Committee: CEN/TC 249/WG 16 - Welding of thermoplastics
• Current Stage: 4020 - Submission to enquiry - Enquiry
• Start Date: 21-May-2026
• Due Date: 22-May-2026
• Completion Date: 21-May-2026
• Ref Project: oSIST prEN 12814-2:2026 - Testing of welded joints of thermoplastics semi-finished products - Part 2: Tensile test

Relations

• Revises: EN 12814-2:2021 - Testing of welded joints of thermoplastics semi-finished products - Part 2: Tensile test
• Effective Date: 02-Jul-2025

Overview

prEN 12814-2 is a draft European Standard developed by CEN (European Committee for Standardization) detailing the procedures for tensile testing of welded joints in thermoplastics semi-finished products. This standard specifies key aspects such as specimen dimensions, sampling methods, specimen preparation, and test conditions required to determine the short-term tensile welding factor. The tensile test methodology outlined in prEN 12814-2 is applicable to welded semi-finished thermoplastics, both filled and unfilled, regardless of the welding process employed, but excludes reinforced materials.

As a vital part of welded joint testing, tensile testing helps ensure the structural integrity and performance of thermoplastic welded assemblies, supporting quality assurance, product qualification, and compliance with industry regulations.

Key Topics

• Test Specimen Preparation
  • Specifies minimum dimensions and geometry for test specimens.
  • Covers both type 1 and type 2 specimen configurations.
  • Outlines the handling of weld beads depending on their in-service condition.
• Sampling Procedures
  • Describes the process for cutting specimens perpendicular to the welded joint at least eight hours after welding.
  • Emphasizes accurate identification and marking of specimen origin.
  • Mandates avoidance of heat and notching during specimen cutting.
• Test Conditions
  • Conditioning to standard temperatures in accordance with EN ISO 291.
  • Mechanical testing speeds and measurements as per EN ISO 527-1 and material recommendations.
  • Use of calibrated test equipment conforming to ISO 5893 requirements.
• Calculation of Short-Term Tensile Welding Factor
  • Provides a method for determining the welding factor by comparing averaged fracture or yield stresses from welded and unwelded specimens.
  • Specifies statistical sample size and handling of specimen failures.
• Test Reporting
  • Comprehensive list of required report details, including dimensions, appearance, force and stress values, test conditions, and deviations from protocol.

Applications

prEN 12814-2 is essential for a range of practical applications within plastics fabrication and product quality control:

• Welded Assembly Qualification
  Used by manufacturers to verify the mechanical performance of welded thermoplastics semi-finished products such as pipes, sheets, and tanks.
• Process Validation
  Supports the development and optimization of welding processes by providing standard methods for welding factor evaluation.
• Personnel Qualification
  Integral to competency certification for plastics welding personnel under related standards.
• Quality Assurance
  Ensures consistency and reliability in the performance characteristics of welded joints, essential in infrastructure, construction, chemical processing, and water management solutions.
• Research and Development
  Facilitates material comparisons and the development of new thermoplastics or welding methodologies.

Related Standards

• EN ISO 291: Specifies standard atmospheres for conditioning and testing plastics.
• EN ISO 527-1: Details general principles for determining tensile properties of plastics.
• EN 13100-1: Provides guidance on visual examination for non-destructive testing of welded thermoplastics joints.
• EN 13067: Addresses qualification testing of thermoplastics welding personnel.
• EN 12814-7: Describes tensile tests with waisted test specimens for welded thermoplastics.
• ISO 5893: Sets specifications for rubber and plastics test equipment, including tensile testing machines.
• ISO 13953: Focuses on the tensile strength determination for polyethylene jointed specimens.

Conclusion

prEN 12814-2 delivers a comprehensive, standardized approach to tensile testing of welded joints in thermoplastic semi-finished products, supporting manufacturers, quality control professionals, welders, and regulatory bodies. By applying the procedures outlined in this standard, stakeholders can ensure that welded thermoplastic assemblies meet rigorous safety, quality, and performance requirements essential in a wide range of industries.

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2026
Preskušanje zvarjenih spojev plastomernih polizdelkov - 2. del: Natezni preskus
Testing of welded joints of thermoplastics semi-finished products - Part 2: Tensile test
Prüfen von Schweißverbindungen an Halbzeugen 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: prEN 12814-2
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.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2026
ICS 25.160.40 Will supersede EN 12814-2:2021
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 an Halbzeugen aus
en thermoplastiques - Partie 2 : Essai de traction thermoplastischen Kunststoffen - Teil 2: Zugversuch
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 249.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12814-2:2026 E
worldwide for CEN national Members.

prEN 12814 2:2026
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 . 5
7 Cutting of test specimens . 7
8 Mechanical testing . 7
9 Test equipment . 8
10 Determination of the short-term tensile welding factor . 8
11 Test report . 8
Annex A (informative) Tensile test specimen for overlap joints . 10
Annex B (informative) Recommended test speeds for some thermoplastics materials . 11
Bibliography . 12
European foreword
This document (prEN 12814-2:2026) has been prepared by Technical Committee CEN/TC 249 “Plastics”,
the secretariat of which is held by SIS.
This document is currently submitted to the CEN enquiry.
This document supersedes EN 12814-2:2021.
In comparison with the previous edition, the following technical modifications have been made:
— the minimum test specimen lengths have been revised;
— Annex C (notched tensile test specimen) has been deleted.
prEN 12814 2:2026
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 ISO 291, Plastics — Standard atmospheres for conditioning and testing(ISO 291)
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
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 https://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 following symbols and abbreviated terms apply:
a minimum measured thickness of the test specimen within mm
calibrated and parallel length
a nominal thickness of the test piece mm
n
b width of calibrated and parallel length of the test specimen mm
b width of shoulder of the test specimen mm
nominal outside diameter of the tube mm
Dn
F the value of force of the unwelded test specimens taken from the N
r
same test piece, used in the calculation of f
s
f the short-term tensile welding factor None
s
F the value of force of the welded test specimen used in the N
w
calculation of f
s
L total length of t
...