SIST EN 12814-7:2024

Testing of welded joints of thermoplastics semi-finished products - Part 7: Tensile test with waisted test specimens

This document specifies the dimensions, the method of sampling, the preparation of the test specimens and the conditions for performing the tensile test with waisted test specimens in order to determine the tensile energy welding factor.
A tensile test with waisted specimens can be used in conjunction with other tests (e.g. bend, tensile, tensile creep, macro, etc.) to assess the performance of welded assemblies, made from thermoplastics materials.
The test is applicable to co-axial or co-planar heated tool butt welded assemblies made from thermoplastics materials filled or unfilled, but not reinforced. It is not applicable to tubular assemblies with a nominal outside diameter less than 90 mm.

Prüfen von Schweißverbindungen aus thermoplastischen Kunststoffen - Teil 7: Zugversuch an Probekörpern mit Rundkerbe

Dieses Dokument legt die Maße, das Verfahren für die Probenahme und die Herstellung von Probekörpern sowie die Bedingungen für die Durchführung des Zugversuchs an Probekörpern mit Rundkerbe fest, um den energiebezogenen Kurzzeitzug-Schweißfaktor zu bestimmen.
Ein Zugversuch an Probekörpern mit Rundkerbe kann in Verbindung mit weiteren Prüfungen durchgeführt werden (z. B. Biegeversuch, Zugversuch, Zeitstand-Zugversuch, makroskopische Untersuchungen usw.), um die Gebrauchstauglichkeit von geschweißten Fügeteilen aus thermoplastischen Kunststoffen zu beurteilen.
Die Prüfung ist auf koaxiale oder in einer Ebene liegende Heizelementstumpfschweißverbindungen aus thermoplastischen Kunststoffen mit oder ohne Füllstoff, die jedoch nicht verstärkt sind, anwendbar. Die Prüfung ist bei Rohrverbindungen mit einem äußeren Nenndurchmesser kleiner 90 mm nicht anwendbar.

Essais des assemblages soudés sur produits semi-finis en thermoplastiques - Partie 7: Essai de traction avec éprouvettes entaillées en U

Le présent document spécifie les dimensions, la méthode d'échantillonnage, la préparation des éprouvettes et les conditions pour effectuer l'essai de traction avec éprouvettes entaillées en U afin de déterminer le facteur de soudage d’énergie de rupture en traction.
Un essai de traction avec éprouvettes entaillées en U peut être utilisé en combinaison avec d'autres essais (par exemple : essai de pliage, essai de traction, essai de fluage, examen macrographique, …) pour évaluer les performances des assemblages soudés en matières thermoplastiques.
Cet essai est applicable à des assemblages soudés au moyen d’un outil chauffé dans le même axe ou le même plan, composés de matières thermoplastiques chargées ou non chargées, mais non renforcées. Il n’est pas applicable aux assemblages de tubes de diamètre extérieur nominal inférieur à 90 mm.

Preskus zvarjenih spojev plastomernih polizdelkov - 7. del: Trgalni preskus z zožanimi preskušanci

Ta dokument določa dimenzije, metodo vzorčenja, pripravo preskušancev in pogoje za izvedbo trgalnega preskusa z zožanimi preskušanci, s katerim se določi natezni faktor zvara.
Trgalni preskus z zožanimi preskušanci je mogoče uporabiti skupaj z drugimi preskusi (npr. preskus upogibanja, natezni preskus, preskus lezenja pri natezni obremenitvi, makro preskus itd.) za oceno zmogljivosti varjenih sestavov iz plastomernih materialov.
Preskus se uporablja za koaksialne ali koplanarne sestave, soležno varjene z ogrevanim orodjem in izdelane iz polnjenih ali nepolnjenih termoplastičnih materialov, ki niso ojačani. Ne uporablja se za cevaste sestave z nazivnim zunanjim premerom, manjšim od 90 mm.

General Information

• Status: Published
• Public Enquiry End Date: 03-Jan-2023
• Publication Date: 22-Apr-2024
• 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: 11-Apr-2024
• Due Date: 16-Jun-2024
• Completion Date: 23-Apr-2024
• Ref Project: EN 12814-7:2024 - Testing of welded joints of thermoplastics semi-finished products - Part 7: Tensile test with waisted test specimens

Relations

• Revised: SIST EN 12814-7:2003 - Testing of welded joints of thermoplastics semi-finished products - Part 7: Tensile test with waisted test specimens
• Effective Date: 19-Jan-2023

Overview

SIST EN 12814-7:2024 is a European standard developed by CEN that specifies the procedures for testing welded joints in thermoplastic semi-finished products using a tensile test with waisted test specimens. This updated standard supersedes EN 12814-7:2002 and introduces revisions such as added symbols and new specimen dimension tables. The testing methodology focuses on determining the tensile energy welding factor, a critical parameter to assess the integrity and performance of welded thermoplastic assemblies.

Applicable primarily to co-axial or co-planar heated tool butt welded assemblies made from both filled and unfilled thermoplastic materials (excluding reinforced plastics), this standard excludes tubular assemblies with nominal outside diameters less than 90 mm. It provides detailed requirements on specimen preparation, testing conditions, and evaluation metrics to ensure consistent and reliable tensile testing outcomes.

Key Topics

• Specimen Dimensions and Preparation: Defines precise dimensions for waisted test specimens dependent on sample thickness (up to 30 mm), including provisions for cutting thicker specimens into multiple layers. Surfaces must be free from notches, and welding beads are to be removed only to the extent necessary.

• Sampling and Marking: Specimens should be cut perpendicular to the weld at least eight hours after welding to ensure settled joint conditions. Each specimen must be clearly identified to preserve traceability.

• Testing Conditions: Specimens must be conditioned at 23 ± 2 °C for 12-24 hours based on thickness, and tested at controlled speeds per EN ISO 527-1 standards. The test involves loading specimens along their longitudinal axis until fracture, measuring load and extension to calculate the energy to break.

• Determination of Tensile Energy Welding Factor: This factor is computed using the ratio of mean energies to break between welded and unwelded specimens. This quantitative measure helps evaluate weld performance in tensile modes.

• Documentation: Comprehensive test reports are mandated, encompassing all relevant details such as test piece description, welding type, test parameters, failure mode, and measured tensile energies, ensuring transparency and reproducibility.

Applications

SIST EN 12814-7:2024 serves as a fundamental standard for industries that fabricate and utilize thermoplastic assemblies, providing a harmonized approach to verify weld strength and quality. Typical applications include:

• Quality Control in Manufacturing: Ensuring consistency and reliability of welded joints in plastic components used in automotive, construction, and consumer goods.

• Research and Development: Assessing new welding techniques or thermoplastic materials by characterizing weld performance under tensile loading conditions.

• Compliance and Certification: Providing standardized test methods for regulatory submissions, product certification, and supplier qualification in the plastics sector.

• Material Selection and Design: Aiding engineers in selecting appropriate thermoplastic materials and designing welded assemblies that meet stringent mechanical performance criteria.

Related Standards

• EN 13100-1: Visual Examination of Welded Joints of Thermoplastics - complements the tensile test by providing guidelines on visual inspection techniques.

• EN ISO 527-1: Plastics - Determination of Tensile Properties - outlines general principles and testing speeds for tensile testing of plastics, which are referenced for specimen testing conditions.

• ISO 5893: Specifications for tensile, flexural, and compression test equipment, ensuring uniformity in mechanical testing apparatus used.

By adhering to SIST EN 12814-7:2024, organizations ensure reliable, standardized evaluation of welded thermoplastic joints, enhancing product durability and safety in practical engineering contexts.

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2024
Preskus zvarjenih spojev plastomernih polizdelkov - 7. del: Trgalni preskus z
zožanimi preskušanci
Testing of welded joints of thermoplastics semi-finished products - Part 7: Tensile test
with waisted test specimens
Prüfen von Schweißverbindungen aus thermoplastischen Kunststoffen - Teil 7:
Zugversuch an Probekörpern mit Rundkerbe
Essais des assemblages soudés sur produits semi-finis en thermoplastiques - Partie 7:
Essai de traction avec éprouvettes entaillées en U
Ta slovenski standard je istoveten z: EN 12814-7:2024
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.

EN 12814-7
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2024
EUROPÄISCHE NORM
ICS 25.160.40 Supersedes EN 12814-7:2002
English Version
Testing of welded joints of thermoplastics semi-finished
products - Part 7: Tensile test with waisted test specimens
Essais des assemblages soudés sur produits semi-finis Prüfen von Schweißverbindungen an Halbzeugen aus
en thermoplastiques - Partie 7 : Essai de traction avec thermoplastischen Kunststoffen - Teil 7: Zugversuch an
éprouvettes entaillées en U Probekörpern mit Rundkerbe
This European Standard was approved by CEN on 15 January 2024.

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, Türkiye 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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12814-7:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references. 4
3 Terms and definitions . 4
4 Symbols and designations . 5
5 Principle of the test . 5
6 Sampling procedures. 5
7 Dimensions of test specimens . 5
8 Cutting of test specimens . 6
9 Mechanical testing . 7
10 Test equipment . 7
11 Determination of the tensile energy welding factor . 7
12 Test report . 8
Annex A (normative) Cutting specimens of thickness > 30 mm into two or more layers . 9
Annex B (informative)  Test speeds for some thermoplastic materials . 10
European foreword
This document (EN 12814-7:2024) has been prepared by Technical Committee CEN/TC 249 “Plastics”,
the secretariat of which is held by SIS.
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 September 2024, and conflicting national standards shall
be withdrawn at the latest by September 2024.
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 12814-7:2002.
In comparison with the previous edition, the following technical modifications have been made:
— the symbols in “Figure 1 — Waisted tensile test specimen” have been added to “Table 1 — Symbols
and designations”;
— modification in Clause 6 following dimensions of test specimens;
— “Table 2 — Dimensions of test specimens” has been added;
— in Table B.1, the test speed for PA-U materials has been added.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
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, Türkiye 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 with waisted test specimens in order to determine the
tensile energy welding factor.
A tensile test with waisted specimens can be used in conjunction with other tests (e.g. bend, tensile,
tensile creep, macro, etc.) to assess the performance of welded assemblies, made from thermoplastics
materials.
The test is applicable to co-axial or co-planar heated tool butt welded assemblies made from
thermoplastics materials filled or unfilled, but not reinforced. It is not applicable to tubular assemblies
with a nominal outside diameter less than 90 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 ref
...

SLOVENSKI STANDARD
01-junij-2024
Preskus zvarjenih spojev plastomernih polizdelkov - 7. del: Trgalni preskus z
zožanimi preskušanci
Testing of welded joints of thermoplastics semi-finished products - Part 7: Tensile test
with waisted test specimens
Prüfen von Schweißverbindungen aus thermoplastischen Kunststoffen - Teil 7:
Zugversuch an Probekörpern mit Rundkerbe
Essais des assemblages soudés sur produits semi-finis en thermoplastiques - Partie 7:
Essai de traction avec éprouvettes entaillées en U
Ta slovenski standard je istoveten z: EN 12814-7:2024
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 12814-7
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2024
EUROPÄISCHE NORM
ICS 25.160.40 Supersedes EN 12814-7:2002
English Version
Testing of welded joints of thermoplastics semi-finished
products - Part 7: Tensile test with waisted test specimens
Essais des assemblages soudés sur produits semi-finis Prüfen von Schweißverbindungen an Halbzeugen aus
en thermoplastiques - Partie 7 : Essai de traction avec thermoplastischen Kunststoffen - Teil 7: Zugversuch an
éprouvettes entaillées en U Probekörpern mit Rundkerbe
This European Standard was approved by CEN on 15 January 2024.

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, Türkiye 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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12814-7:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references. 4
3 Terms and definitions . 4
4 Symbols and designations . 5
5 Principle of the test . 5
6 Sampling procedures. 5
7 Dimensions of test specimens . 5
8 Cutting of test specimens . 6
9 Mechanical testing . 7
10 Test equipment . 7
11 Determination of the tensile energy welding factor . 7
12 Test report . 8
Annex A (normative) Cutting specimens of thickness > 30 mm into two or more layers . 9
Annex B (informative)  Test speeds for some thermoplastic materials . 10
European foreword
This document (EN 12814-7:2024) has been prepared by Technical Committee CEN/TC 249 “Plastics”,
the secretariat of which is held by SIS.
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 September 2024, and conflicting national standards shall
be withdrawn at the latest by September 2024.
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 12814-7:2002.
In comparison with the previous edition, the following technical modifications have been made:
— the symbols in “Figure 1 — Waisted tensile test specimen” have been added to “Table 1 — Symbols
and designations”;
— modification in Clause 6 following dimensions of test specimens;
— “Table 2 — Dimensions of test specimens” has been added;
— in Table B.1, the test speed for PA-U materials has been added.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
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, Türkiye 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 with waisted test specimens in order to determine the
tensile energy welding factor.
A tensile test with waisted specimens can be used in conjunction with other tests (e.g. bend, tensile,
tensile creep, macro, etc.) to assess the performance of welded assemblies, made from thermoplastics
materials.
The test is applicable to co-axial or co-planar heated tool butt welded assemblies made from
thermoplastics materials filled or unfilled, but not reinforced. It is not applicable to tubular assemblies
with a nominal outside diameter less than 90 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 o
...