FprEN 12814-6

Testing of welded joints of thermoplastics semi-finished products - Part 6: Low temperature tensile test

This document specifies the dimensions, the method of sampling and the preparation of the test specimens, also the conditions for performing the low temperature tensile test perpendicular to the weld in order to determine the low temperature tensile welding factor.
A low temperature 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 low temperature tensile welding factor and the appearance of the fracture surface provide a guide regarding the ductility of the joint and the quality of the work.
This document is applicable to co-axial or co-planar welded assemblies made from thermoplastics materials filled or unfilled, but not reinforced, irrespective of the welding process used.
This document does not apply to co-axial welded assemblies of an external diameter less than 20 mm.

Prüfen von Schweißverbindungen aus thermoplastischen Kunststoffen - Teil 6: Zugversuch bei tiefen Temperaturen

Dieses Dokument legt die Maße, das Probenahmeverfahren und die Vorbereitung der Proben sowie die Bedin
gungen für die Durchführung der Zugprüfung bei tiefen Temperaturen senkrecht zur Schweißnaht fest, um den Zug-Schweißfaktor bei tiefen Temperaturen zu bestimmen.
Eine Zugprüfung bei tiefen Temperaturen kann in Verbindung mit weiteren Prüfungen (z.B. Biegeprüfung, Zeitstand-Zugprüfung, makroskopische Untersuchung) angewendet werden, um die Gebrauchstauglichkeit von geschweißten Baugruppen aus thermoplastischen Kunststoffen zu beurteilen.
Der Zug-Schweißfaktor bei tiefen Temperaturen und das Aussehen der Bruchfläche stellen ein Hilfsmittel für die Bewertung der Dehnbarkeit der Verbindung und die Qualität der Schweißung dar.
Dieses Dokument ist auf koaxiale oder in einer Ebene liegende Schweißverbindungen anwendbar, die aus gefüllten oder ungefüllten, nicht aber aus verstärkten thermoplastischen Kunststoffen bestehen, unabhängig vom angewendeten Schweißverfahren.
Dieses Dokument ist nicht anwendbar für koaxiale Baugruppen mit einem Außendurchmesser<20mm.

Essais des assemblages soudés sur produits semi-finis en thermoplastiques - Partie 6 : Essai de traction à basse température

Le présent document spécifie les dimensions, la méthode de prélèvement et de préparation des éprouvettes, ainsi que les conditions d'exécution de l'essai de traction à basse température effectué perpendiculairement à la soudure, afin de déterminer le facteur de soudage en traction à basse température.
Un essai de traction à basse température peut être effectué en combinaison avec d'autres essais (par exemple, essai de pliage, essai de fluage en traction, examen macrographique, etc.) afin d'évaluer les performances des assemblages soudés, réalisés avec des matériaux thermoplastiques.
Le facteur de soudage en traction à basse température et l'aspect de la surface de rupture renseignent sur la ductilité de la soudure et la qualité des travaux de soudage.
Le présent document est applicable aux assemblages soudés dans le même axe ou le même plan, réalisés avec des matériaux thermoplastiques chargés ou non chargés, mais non renforcés, quel que soit le
procédé de soudage utilisé.
Le présent document ne s'applique pas aux assemblages soudés dans le même axe ayant un diamètre
extérieur inférieur à 20 mm.

Preskus zvarjenih spojev plastomernih polizdelkov - 6. del: Trgalni preskus pri nizki temperaturi

General Information

• Status: Not Published
• Publication Date: 19-Aug-2026
• 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: 4599 - Dispatch of FV draft to CMC - Finalization for Vote
• Start Date: 02-Mar-2026
• Due Date: 11-May-2026
• Completion Date: 02-Mar-2026
• Ref Project: oSIST prEN 12814-6:2025 - Testing of welded joints of thermoplastics semi-finished products - Part 6: Low temperature tensile test

Relations

• Revises: EN 12814-6:2000 - Testing of welded joints of thermoplastics semi-finished products - Part 6: Low temperature tensile test
• Effective Date: 07-Aug-2024

Overview

FprEN 12814-6 is a European standard developed by CEN that specifies the procedures for low temperature tensile testing on welded joints of thermoplastics semi-finished products. The document defines the dimensions, sampling methods, specimen preparation, and test conditions for evaluating the properties of welds perpendicular to the joint. The primary objective is to determine the low temperature tensile welding factor, which provides an indication of the strength and ductility of a welded assembly under low temperature conditions. This critical test can be combined with other methods such as bend and tensile creep tests to comprehensively assess weld performance, particularly in demanding environments.

Key Topics

• Test Specimen Preparation: Clear specifications for cutting and marking both welded and unwelded specimens from semi-finished thermoplastics, ensuring meaningful comparison.
• Test Parameters: Conditions for performing the tensile test at low temperature, including considerations for temperature stability and test speed.
• Applicability: Suitable for co-axial or co-planar welded assemblies, whether filled or unfilled, and regardless of the welding technique used. The test does not apply to assemblies with an external diameter below 20 mm.
• Welding Factor Evaluation: Guidelines for calculating the low temperature tensile welding factor based on stress values from welded and unwelded specimens.
• Fracture Surface Analysis: The appearance and type of the fracture is used to assess ductility and weld quality, which are critical for ensuring reliability in service.
• Comprehensive Reporting: Requirements for documenting test conditions, specimen details, and results, providing traceability and facilitating quality control.

Applications

The procedures outlined in FprEN 12814-6 are widely applicable in industries that use welded thermoplastics for piping systems, structural components, and assemblies where performance in low temperature environments is essential. Practical applications include:

• Quality Assurance of Welded Joints: Enables manufacturers and inspectors to assess weld integrity and performance, ensuring compliance with industry requirements.
• Weld Procedure Qualification: Supports validation of welding procedures by providing standardized testing conditions and acceptance criteria.
• Material and Weld Selection: Assists engineers in selecting appropriate materials and welding methods for low temperature service, reducing failure risk.
• Performance Benchmarking: Facilitates comparison between different products or fabrication techniques, helping in product development and competitive analysis.
• Regulatory Compliance: Meets requirements for third-party certification, customer specifications, and harmonized construction product regulations.

Related Standards

For a comprehensive approach to testing and validating welded thermoplastics, the following standards are relevant:

• EN 13100-1 - Non-destructive testing of welded joints of thermoplastics semi-finished products - Part 1: Visual examination.
• EN ISO 291 - Plastics - Standard atmospheres for conditioning and testing.
• ISO 5893 - Test equipment for rubber and plastics - Specification for tensile, flexural, and compression tests.
• EN 12814 Series - Covers additional testing methods such as bend, tensile creep, and macro analysis for a complete assessment of welded thermoplastics joints.

By following FprEN 12814-6, organizations can enhance reliability, safety, and quality in thermoplastics welding applications, particularly when performance at low temperatures is a critical design consideration.

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2025
Preskus zvarjenih spojev plastomernih polizdelkov - 6. del: Trgalni preskus pri
nizki temperaturi
Testing of welded joints of thermoplastics semi-finished products - Part 6: Low
temperature tensile test
Prüfen von Schweißverbindungen aus thermoplastischen Kunststoffen - Teil 6:
Zugversuch bei tiefen Temperaturen
Essais des assemblages soudés sur produits semi-finis en thermoplastiques - Partie 6 :
Essai de traction à basse température
Ta slovenski standard je istoveten z: prEN 12814-6
ICS:
25.160.40 Varjeni spoji in vari Welded joints and welds
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
prEN 12814-6
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2025
ICS 25.160.40 Will supersede EN 12814-6:2000
English Version
Testing of welded joints of thermoplastics semi-finished
products - Part 6: Low temperature tensile test
Essais des assemblages soudés sur produits semi-finis Prüfen von Schweißverbindungen aus
en thermoplastiques - Partie 6 : Essai de traction à thermoplastischen Kunststoffen - Teil 6: Zugversuch
basse température bei tiefen Temperaturen
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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12814-6:2025 E
worldwide for CEN national Members.

prEN 12814-6:2025 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Principle of the test . 6
5 Sampling procedures . 6
6 Dimensions of test specimens . 6
7 Cutting of test specimens . 8
8 Mechanical testing . 9
9 Test equipment . 9
10 Determination of the low temperature tensile welding factor . 9
11 Test report . 10
Annex A (informative) Test speeds and maximum test temperatures . 11

prEN 12814-6:2025 (E)
European foreword
This document (prEN 12814-6:2025) 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 will supersede EN 12814-6:2000.
prEN 12814-6:2025 includes the following significant technical changes with respect to
EN 12814-6:2000:
— It has been clarified that if one test specimen yields, all of the test specimens cut from both the welded
and unwelded test piece shall be tested at a temperature/speed that generates brittle fracture, not
just one specimen.
A list of all parts in a series can be found on the CEN website: https://www.cencenelec.eu/
prEN 12814-6:2025 (E)
1 Scope
This document specifies the dimensions, the method of sampling and the preparation of the test
specimens, also the conditions for performing the low temperature tensile test perpendicular to the weld
in order to determine the low temperature tensile welding factor.
A low temperature 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 low temperature tensile welding factor and the appearance of the fracture surface provide a guide
regarding the ductility of the joint and the quality of the work.
The test is applicable to co-axial or co-planar welded assemblies made from thermoplastics materials
filled or unfilled, but not reinforced, irrespective of the welding process used.
The test is not applicable for co-axial welded assemblies of an external diameter less than 20 mm.
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
ISO 5893, Rubber and plastics test equipment — Tensile, flexural and compression types (constant rate of
traverse) — Specification
3 Terms and definitions
For the purposes of this document, the following t
...