Overview
ISO 10893-7:2019 specifies requirements for digital radiographic testing of the longitudinal or helical weld seams of automatic fusion arc‑welded steel tubes to detect imperfections. It covers both computed radiography (CR) and radiography with digital detector arrays (DDAs), defines acceptance levels, calibration procedures, image quality classes, and general testing and reporting requirements. The standard can also be applied to circular hollow sections and is the digital alternative to ISO 10893-6 (film‑based radiography).
Key topics and requirements
- Scope and methods
- Applies to digital X‑ray testing of weld seams using CR, DDAs, or digital radioscopy with image integration.
- Single‑wall penetration is preferred; double‑wall allowed by agreement if sensitivity is demonstrable.
- Image quality
- Two image quality classes: Class A (standard sensitivity) and Class B (enhanced sensitivity) (aligned to ISO 17636-2).
- Image quality verification, detector unsharpness and spatial resolution requirements reference ISO 19232 series.
- Equipment and calibration
- Requirements for CR plates, digital detector arrays and related imaging systems.
- Calibration procedures and detector performance checks are required; DDA calibration referenced to ISO 17636-2.
- Test procedure and geometry
- Beam directed normal to tube surface; detector placement and source‑to‑weld geometry limited by specified f/d relationships and detector length considerations.
- If detector is smaller than weld length, start‑stop imaging is required.
- Personnel and safety
- Testing must be performed by certified/qualified NDT personnel (e.g., ISO 9712, ISO 11484).
- Explicit radiation safety warning: apply applicable local, national and international ionizing‑radiation precautions.
- Image processing, storage and reporting
- Requirements for image processing, marking, storage and traceability; radiographs must include identifiers/markers for unequivocal location.
- Test report content and acceptance decision rules are specified.
Practical applications
- Quality control and acceptance testing of welded steel tubes used in:
- Pressure piping and structural tubing
- Energy and pipeline components
- Circular hollow sections and fabricated tubular products
- Useful for manufacturers, production inspectors, third‑party NDT providers, quality managers and regulatory bodies who need reproducible, digitized radiographic inspection of weld seams.
Who should use this standard
- Tube manufacturers and fabricators using automatic fusion arc welding
- NDT technicians and Level 2/3 supervisors responsible for radiographic testing
- Quality assurance/inspection teams and third‑party certification bodies
Related standards
Keywords: ISO 10893-7:2019, digital radiographic testing, welded steel tubes, weld seam inspection, computed radiography, digital detector arrays, NDT, image quality, acceptance levels, calibration.
Open preview (PDF)Non-destructive testing of steel tubes — Part 7: Digital radiographic testing of the weld seam of welded steel tubes for the detection of imperfections