Overview
ISO 9017:2017 - "Destructive tests on welds in metallic materials - Fracture test" defines how to prepare and carry out fracture (destructive) tests on welded joints to reveal internal imperfections. The standard specifies test‑piece and specimen dimensions, notching and preparation methods, and fracture techniques (bending, tension, impact) for metallic products with fusion‑welded joints of thickness ≥ 2 mm. Its purpose is to obtain information about types, sizes and distribution of internal defects such as porosities, cracks, lack of fusion, lack of penetration and solid inclusions on the fracture surface.
Key topics and technical requirements
- Scope: Applies to metallic materials in all product forms with fusion welding processes and thickness ≥ 2 mm.
- Specimen dimensions: Test‑piece and specimen sizes are given (plate, pipe, fillet and butt weld arrangements). For high‑thermal‑conductivity materials a minimum length (a) ≥ 150 mm is recommended.
- Notching and preparation: Side, face and root notches in square, round or sharp profiles; notch depths recommended to induce fracture (e.g., side notch Lf ≥ 70% of specimen width or ΣLf ≥ 60% of specimen length; longitudinal notch af ≥ 80% of original thickness).
- Extraction and cutting: Steels may be thermally or mechanically cut; other metallic materials must be cut mechanically. Avoid thermal/mechanical damage during extraction; typically discard ~25 mm of weld ends unless start/stop imperfections are required.
- Test methods: Fracture may be induced by dynamic impact (hammer), pressing (vice/press/bending machine) or tension. Test temperature is normally ambient (23 ± 5 °C) unless otherwise specified. Special procedures for thin vs. thick materials are described (e.g., alternate bending for thin materials; hammer impact acceptable for thick).
- Reporting: The standard requires recording examination lengths/areas, notching, test method and detailed test reports (Annex A example).
Applications and users
ISO 9017:2017 is used to:
- Verify internal weld integrity during fabrication and QA/QC inspection
- Characterize weld metal ductility and defect distribution
- Support failure investigation and root‑cause analysis
Typical users include welding inspectors, QA/QC engineers, testing laboratories, fabricators, certification bodies and design engineers who need standardized destructive test procedures to assess weld quality.
Related standards
- ISO 5817 - Quality levels for imperfections in fusion‑welded joints (steel, nickel, titanium)
- ISO 10042 - Quality levels for arc‑welded aluminium joints
- ISO 17637 - Visual (non‑destructive) testing of welds
Using ISO 9017 in conjunction with visual and acceptance standards (ISO 5817 / ISO 10042) provides a practical, standardized approach for weld assessment and documentation.