EN 12814-3:2014
(Main)Testing of welded joints in thermoplastics semi-finished products - Part 3: Tensile creep test
Testing of welded joints in thermoplastics semi-finished products - Part 3: Tensile creep test
This European Standard specifies the dimensions, the method of sampling and the preparation of the test specimens, and the conditions for performing the tensile creep test perpendicular to the weld in order to determine the long-term tensile welding factor.
A tensile creep test may be used in conjunction with other tests (e.g. bend test, tensile test, macrographic examination,...) to assess the performance of welded assemblies, made from thermoplastics materials.
The test is applicable to welded assemblies made from thermoplastics materials filled or unfilled such as tubes and fittings, sheets, plates and profiles, but not reinforced, irrespective of the welding process used.
Prüfen von Schweißverbindungen aus thermoplastischen Kunststoffen - Teil 3: Zeitstand-Zugversuch
Diese Europäische Norm legt Maße, Probenahmeverfahren, Probenvorbereitung sowie Durch¬führungs-bedingungen für einen Zeitstand-Zugversuch rechtwinklig zur Schweißnaht fest, bei dem der Zeitstandzug-Schweißfaktor bestimmt wird.
Ein Zeitstand-Zugversuch kann zusammen mit anderen Prüfungen (z. B. Biegeversuch, Zugversuch, makrographische Untersuchung) angewendet werden, um das Betriebsverhalten von Schweißverbindungen aus thermoplastischen Kunststoffen zu beurteilen.
Der Zeitstand-Zugversuch ist auf Schweißverbindungen aus gefüllten oder ungefüllten, jedoch nicht aus verstärkten thermoplastischen Kunststoffen unabhängig vom angewendeten Schweißverfahren anwendbar, z. B. auf Rohre, Fittings, Bahnen und Platten sowie Profile.
Essais des assemblages soudés sur produits semi-finis en thermoplastiques - Partie 3: Essai de fluage en traction
La présente Norme européenne spécifie les dimensions, la méthode d'échantillonnage et la préparation des éprouvettes, ainsi que les conditions d'exécution de l'essai de fluage en traction perpendiculairement à la soudure, afin de déterminer le coefficient de soudure en traction à long terme.
Un essai de fluage en traction peut être utilisé conjointement avec d'autres essais (par exemple : essai de pliage, essai de traction, examen macrographique, ...) pour évaluer les performances des assemblages soudés en thermoplastiques.
Cet essai est applicable aux assemblages soudés constitués de matières thermoplastiques chargées ou non chargées, telles que tubes et raccords, feuilles, plaques et profilés, mais non renforcées, indépendamment du procédé de soudage utilisé.
Preskus zvarjenih spojev plastomernih polizdelkov - 3. del: Preskus lezenja pri natezni obremenitvi
Standard EN 12814-3 določa dimenzije, metodo vzorčenja, pripravo preskusnih vzorcev in pogoje za izvedbo preskusa lezenja pri natezni obremenitvi, pravokotno na zvar, s katerim se določi dolgoročni natezni faktor zvara. Preskus lezenja pri natezni obremenitvi se lahko uporabi skupaj z drugimi preskusi (npr. preskus upogibanja, natezni preskus, makrografski pregled ...) za oceno zmogljivosti varjenih sestavov iz termoplastičnih materialov. Preskus se uporablja za varjene sestave iz polnjenih ali nepolnjenih termoplastičnih materialov, kot so cevi in spojniki, ponjave, plošče, in profili, ki niso ojačani – ne glede na uporabljeni postopek varjenja.
General Information
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Overview
EN 12814-3:2014 - Testing of welded joints in thermoplastics semi-finished products: Part 3: Tensile creep test - specifies how to sample, prepare and test specimens to determine the long-term tensile welding factor of welded thermoplastic assemblies. The method measures time-to-failure under a constant tensile load applied perpendicular to the weld (tensile creep) and is intended for tubes, fittings, sheets, plates and profiles made of filled or unfilled thermoplastics (not reinforced), regardless of welding process.
Key topics and technical requirements
- Test principle: constant-load tensile creep until fracture; measure time-to-failure and establish creep rupture curves for welded and unwelded (parent) material.
- Specimen preparation: welded and unwelded specimens must come from the same test piece; cut perpendicular to the weld at least 8 hours after welding; no heat treatment or straightening.
- Specimen types: two standard specimen geometries (Type 1 and Type 2) defined; an alternative whole pipe tensile creep rupture test is available (Annex B); special rules for socket joints (Annex D).
- Test conditions: specimens conditioned to test temperature; temperature variation ≤ ±1 °C; media that do not cause swelling or degradation (air, water, aqueous surfactant solutions); recommended minimum of six welded and six unwelded specimens per stress level and temperature.
- Data analysis: calculate geometric mean times, plot creep rupture curves on a bi-logarithmic scale (stress vs. time), and compute the long‑term tensile welding factor (fl) as the ratio of stresses for identical failure times (fl = σs / σt). Regression requires tests at a minimum of two stress levels.
- Quality indicators: fracture appearance (ductile vs brittle proportions) and resistance to slow crack growth are used to assess weld performance (Annex A); minimum parent-material creep rupture time (ttm) is required for applicability (Annex C).
- Dimensional tolerances: e.g., width b tolerance ±1 mm, calibrated length L0 tolerance ±2 mm; variation of b over L0 ≤ ±2%.
Applications
- Use EN 12814-3:2014 for qualification and quality assessment of welded thermoplastic assemblies subject to long-term static loads.
- Typical applications: pressure piping, drainage systems, tanks, structural profiles and fabricated fabrications where creep rupture performance of welds affects service life.
- Results feed design calculations together with parent-material creep rupture curves (e.g., EN 1778) to select weld procedures, evaluate joining methods, and set inspection/acceptance criteria.
Who should use this standard
- Materials engineers, welding procedure qualifiers, test laboratories, product designers, and quality managers working with thermoplastics joining and long-term structural performance.
Related standards
- EN 12814 series (Parts 1–8) - other welded-joint test methods (bend, tensile, peel, macroscopic exam, etc.)
- EN ISO 899-1 - tensile creep testing method
- EN 13100-1 - visual examination of welded joints
- EN 1778 - parent material creep rupture data (referenced in design)
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Preskus zvarjenih spojev plastomernih polizdelkov - 3. del: Preskus lezenja pri natezni obremenitviPrüfen von Schweißverbindungen aus thermoplastischen Kunststoffen - Teil 3: Zeitstand-ZugversuchEssais des assemblages soudés sur produits semi-finis en thermoplastiques - Partie 3: Essai de fluage en tractionTesting of welded joints in thermoplastics semi-finished products - Part 3: Tensile creep test25.160.40Varjeni spoji in variWelded jointsICS:Ta slovenski standard je istoveten z:EN 12814-3:2014SIST EN 12814-3:2014en,fr,de01-maj-2014SIST EN 12814-3:2014SLOVENSKI
STANDARDSIST EN 12814-3:2000/A1:2005SIST EN 12814-3:20001DGRPHãþD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12814-3
February 2014 ICS 25.160.40 Supersedes EN 12814-3:2000English Version
Testing of welded joints in thermoplastics semi-finished products - Part 3: Tensile creep test
Essais des assemblages soudés sur produits semi-finis en thermoplastiques - Partie 3: Essai de fluage en traction
Prüfen von Schweißverbindungen aus thermoplastischen Kunststoffen - Teil 3: Zeitstand-Zugversuch This European Standard was approved by CEN on 30 November 2013.
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
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12814-3:2014 ESIST EN 12814-3:2014
Page Foreword .3 Introduction .4 1 Scope .5 2 Normative references .5 3 Terms and definitions .5 4 Symbols and designations .5 5 Principle of the test.6 6 Sampling procedures .7 7 Dimensions of test specimens .7 8 Cutting and preparation of test specimens .9 9 Mechanical testing . 10 10 Test equipment . 10 11 Determination of the long-term welding factor . 11 12 Test report . 13 Annex A (informative)
Resistance to slow crack growth . 15 Annex B (informative)
Whole pipe tensile creep rupture test . 18 Annex C (informative)
Minimum creep rupture time of the parent material (ttm) for applicability of the long-term welding factor . 21 Annex D (informative)
Testing of socket joints . 22 Bibliography . 25
Fs Value of the force applied to the welded test specimen calculated from the chosen value of 1s N Ft Value of the force applied to the unwelded test specimen calculated from the chosen value of 1t N L Total length of the test specimen mm Lj Minimum distance between the clamping jaws mm L0 Calibrated and parallel length of the test specimen mm Lw a Maximum width of the weld bead of the test specimen mm r Radius of shoulder of the test specimen mm ttm Minimum failure time h 1s Value of stress of the welded test specimens used in the calculation of fl N/mm2 1t Reference stress. Value of stress of the unwelded test specimens, used in the calculation of fl N/mm2 a For extrusion and hot gas welds only.
5 Principle of the test The test involves subjecting a test specimen to a constant load until fracture occurs. The time to fracture is measured and recorded. NOTE An alternative test using a whole pipe welded sample rather that a test specimen cut form the weld is given in Annex B. SIST EN 12814-3:2014
Key Lj
= L0 + (2xb) Figure 1 — Type 1 test specimen for flat and tubular assemblies
Figure 2 — Type 2 test specimen for flat and tubular assemblies
an ≤ 10 15 120 ≥ 170 10 < an ≤ 20 30 120 ≥ 170 an > 20 1,5 x an 3 x an + Lw with 120 min ≥ L0 + 80
Table 3 — Dimensions of type 2 test specimens Dimensions in millimetres Dn or an b min. b1 L0 L r 20 ≤ Dn < 50 10nnDa+ b + 10 Lw + 60 ≥ 120 60 50 ≤ Dn < 100 10nnDa+ b + 10 Lw + 60 ≥ 170 60 Dn ≥ 100 or flat assemblies:
an ≤ 10 10 20 115 ≥ 170 60 10 < an ≤ 20 30 40 115 ≥ 170 60 an > 20 1,5 x an 2,5 x an 3 x an + Lw with 120 min ≥ L0 + 80 60
Where the beads are left intact in service, they shall be left intact for the test. Where the beads are removed in service, they shall be removed prior to testing. The minimum value for b shall be 6 mm. The tolerance for b shall be ± 1 mm. The tolerance for L0 shall be ± 2 mm. The variation of b over the length L0 shall not exceed ± 2 % of the average value of b. 8 Cutting and preparation of test specimens The tensile creep test specimens shall be cut with parallel sides as shown in Figures 1 and 2. During cutting, heating of the test specimen shall be minimized. The cutting operation shall not cause any damage to the test specimen. After cutting, a visual examination of the weld according to EN 13100-1 shall be carried out and recorded. SIST EN 12814-3:2014
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Frequently Asked Questions
EN 12814-3:2014 is a standard published by the European Committee for Standardization (CEN). Its full title is "Testing of welded joints in thermoplastics semi-finished products - Part 3: Tensile creep test". This standard covers: This European Standard specifies the dimensions, the method of sampling and the preparation of the test specimens, and the conditions for performing the tensile creep test perpendicular to the weld in order to determine the long-term tensile welding factor. A tensile creep test may be used in conjunction with other tests (e.g. bend test, tensile test, macrographic examination,...) to assess the performance of welded assemblies, made from thermoplastics materials. The test is applicable to welded assemblies made from thermoplastics materials filled or unfilled such as tubes and fittings, sheets, plates and profiles, but not reinforced, irrespective of the welding process used.
This European Standard specifies the dimensions, the method of sampling and the preparation of the test specimens, and the conditions for performing the tensile creep test perpendicular to the weld in order to determine the long-term tensile welding factor. A tensile creep test may be used in conjunction with other tests (e.g. bend test, tensile test, macrographic examination,...) to assess the performance of welded assemblies, made from thermoplastics materials. The test is applicable to welded assemblies made from thermoplastics materials filled or unfilled such as tubes and fittings, sheets, plates and profiles, but not reinforced, irrespective of the welding process used.
EN 12814-3:2014 is classified under the following ICS (International Classification for Standards) categories: 25.160.40 - Welded joints and welds. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 12814-3:2014 has the following relationships with other standards: It is inter standard links to EN 12814-3:2000/A1:2005, EN 12814-3:2000. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase EN 12814-3:2014 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CEN standards.
SIST EN 12814-3:2014 표준은 열가소성 반제품의 용접 이음새를 테스트하기 위한 중요한 기준을 제시합니다. 이 표준의 범위는 주로 용접의 인장 크리프 테스트를 수행하기 위한 시험편의 치수, 샘플링 방법 및 준비 과정, 그리고 용접에 수직으로 인장 크리프 테스트를 수행하는 조건을 규정하고 있습니다. 이 표준의 주요 강점은 다양한 열가소성 재료로 만들어진 용접 조립체의 성능을 평가할 수 있는 유연성을 제공한다는 점입니다. 인장 크리프 테스트는 굽힘 테스트, 인장 테스트, 거대 그림 검사 등의 다른 테스트와 결합하여 활용될 수 있어, 보다 포괄적인 평가를 가능하게 합니다. 이는 특히 다양한 용접 공정에서 사용된 튜브, 피팅, 판재 및 프로파일과 같은 열가소성 재료에 적용될 수 있습니다. SIST EN 12814-3:2014 표준은 강화되지 않은 열가소성 재료에서도 적용 가능하며, 이는 다양한 산업 분야에서 용접 품질 및 장기 성능을 평가하는 데 매우 유용합니다. 이러한 점에서 이 표준은 열가소성 재료 용접 기술의 발전과 신뢰성을 증대시키는 데 기여하고 있습니다. 표준의 중요성은 용접 기술의 일관성과 신뢰성을 담보함으로써, 산업 전반에 걸쳐 안전하고 효율적인 제품 생산에 기여하는 데 있습니다.
The standard EN 12814-3:2014 provides a comprehensive framework for the testing of welded joints in thermoplastics semi-finished products, specifically focusing on the tensile creep test. The document outlines detailed specifications regarding dimensions, sampling methods, and preparation of test specimens, which are critical for standardizing the assessment of weld integrity in thermoplastics. One of the significant strengths of this standard is its explicit guidance on conducting the tensile creep test perpendicular to the weld, which is essential for accurately determining the long-term tensile welding factor. This provides valuable insights into the durability and long-term performance of welded thermoplastic assemblies. Additionally, the ability to use the tensile creep test in conjunction with other evaluation techniques, such as bend tests and macrographic examination, offers a holistic approach to assessing the performance and reliability of welded thermoplastic joints. The scope of the standard is particularly relevant as it applies to a variety of thermoplastics materials, both filled and unfilled, including tubes, fittings, sheets, plates, and profiles. This inclusivity ensures that a wide range of applications can benefit from the testing protocols outlined in the standard, while maintaining a clear exclusion of reinforced materials, thus offering focused applicability. Overall, EN 12814-3:2014 stands out as a vital document for engineers, manufacturers, and quality assurance professionals involved in the production and testing of thermoplastic welded assemblies, ensuring that they have a reliable method for evaluating the integrity and performance of these critical joints.
SIST EN 12814-3:2014は、熱可塑性半製品の溶接接合部の試験に関する欧州標準の一部であり、その中でも特に引張クリープ試験に焦点を当てています。この標準は、試験片の寸法、サンプリング方法、試験準備の手順、さらには溶接に対して垂直に引張クリープ試験を行うための条件を定めています。これにより、長期的な引張溶接係数を測定することが可能になります。 この標準の強みは、熱可塑性材料を使用した溶接接合体の性能を評価するために特化されたテスト手法を提供している点です。また、引張クリープ試験は他の試験（曲げ試験、引張試験、マクログラフィック検査など）と組み合わせて使用することができるため、さまざまな条件下での溶接性能を総合的に理解するために役立ちます。これは、特にチューブやフィッティング、シート、プレート、プロファイルなどの非強化熱可塑性材料から構成される溶接接合体の評価において極めて重要です。 SIST EN 12814-3:2014は、熱可塑性材料の溶接接合部に関する試験標準として、その実用性と適用範囲が豊かであり、業界全体での規範的な指針を提供している点で、大きな意義を持っています。この標準を参考にすることで、製品の品質と信頼性を高め、業界のベストプラクティスに従った製造プロセスを確立することが可能となります。
Die EN 12814-3:2014 ist ein wichtiger Standard, der sich mit der Prüfung von Schweißverbindungen in thermoplastischen Halbzeugen befasst. Der Fokus liegt auf dem Zugkriechtest, der speziell zur Bestimmung des langfristigen Zugschweißfaktors entwickelt wurde. Der Umfang des Standards umfasst präzise Vorgaben für die Dimensionierung, die Probenentnahme und die Vorbereitung der Prüfkörper sowie die Bedingungen für die Durchführung des Zugkriechtests, der senkrecht zur Schweißnaht durchgeführt wird. Ein herausragendes Merkmal dieser Norm ist ihre detaillierte Beschreibung der Vorgehensweise, die es den Anwendern ermöglicht, konsistente und reproduzierbare Testergebnisse zu erzielen. Der Zugkriechtest ist nicht nur ein eigenständiges Prüfverfahren, sondern lässt sich auch mit anderen Tests wie dem Biegetest und der makroskopischen Untersuchung kombinieren. Dies erhöht die Aussagekraft der Prüfung und unterstützt umfassendere Bewertungen der Leistungsfähigkeit von geschweißenen Baugruppen. Die Relevanz der EN 12814-3:2014 erstreckt sich auf verschiedene Anwendungen im Bereich der thermoplastischen Werkstoffe, da sie für eine Vielzahl von Produkten wie Rohre, Fittings, Platten und Profile ausgelegt ist. Dies geschieht unabhängig vom verwendeten Schweißprozess und berücksichtigt sowohl gefüllte als auch ungefüllte Materialien. Die Norm ist somit ein entscheidendes Instrument für Ingenieure und Fachleute in der Kunststoffverarbeitung, um die Qualität und Langlebigkeit von Schweißverbindungen zu gewährleisten. Insgesamt liefert die EN 12814-3:2014 eine essentielle Grundlage zur Beurteilung der Festigkeit und der Langzeitbeständigkeit von Schweißverbindungen in thermoplastischen Materialien, was für die Sicherheit und Zuverlässigkeit von Produkten in verschiedenen Industrien unerlässlich ist.
La norme EN 12814-3:2014 offre une référence précise pour l'évaluation des joints soudés dans les produits semi-finis en thermoplastiques, spécifiquement par le biais du test de fluage en traction. Son champ d'application est clairement défini, incluant des éléments tels que les dimensions, la méthode de prélèvement et la préparation des échantillons de test. Cela garantit une standardisation essentielle dans le domaine des matériaux thermoplastiques, facilitant ainsi la comparaison des résultats entre différentes études et applications industrielles. Parmi les points forts de cette norme, on trouve sa capacité à fournir des conditions de test rigoureuses pour mesurer le facteur de soudage à long terme en traction. Cette mesure est cruciale pour les assemblages soudés, qu'ils soient remplis ou non remplis, et couvre une large gamme de produits tels que les tubes, les raccords, les plaques et les profils. De plus, l'intégration possible de ce test avec d'autres évaluations, comme les tests de flexion et les examens macrographiques, permet d'obtenir une vue d'ensemble plus complète de la performance des assemblages soudés. La pertinence de la norme EN 12814-3:2014 est indiscutable, surtout dans un contexte où les thermoplastiques gagnent en popularité dans diverses applications industrielles. La possibilité d'appliquer cette norme à divers types de procédés de soudage renforce sa flexibilité et son utilité pour les professionnels du secteur. Ce cadre normatif aide non seulement à garantir la qualité des joints soudés mais également à assurer la durabilité et la sécurité des produits finis.
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