Overview
EN ISO 10893-11:2011 - "Non‑destructive testing of steel tubes - Part 11" specifies requirements for automated ultrasonic testing (AUT) of the weld seam of welded steel tubes to detect longitudinal and/or transverse imperfections. The standard addresses ultrasonic shear‑wave techniques generated by conventional probes or phased‑array systems and applies to submerged arc‑welded (SAW) and electric resistance / induction‑welded (EW) tubes. It can also be applied to circular hollow sections.
Key topics and technical requirements
- Scope of testing
- SAW tubes: detection of imperfections oriented predominantly parallel to the weld seam, or (by agreement) perpendicular, or both.
- EW tubes: detection of imperfections predominantly parallel to the weld seam; Lamb‑wave testing may be used for longitudinal imperfections at the manufacturer’s discretion.
- Full peripheral ultrasonic testing is possible for EW weld seams.
- Ultrasonic technique
- Automated shear‑wave testing using conventional or phased‑array ultrasonic equipment.
- Timing and conditions
- Testing is normally performed after completion of primary production (rolling, heat treatment, sizing, expansion, etc.). For cold‑expanded tubes, test after expansion; spiral welded tubes may be tested online where agreed.
- Tubes must be straight enough and surfaces sufficiently clean for valid inspection.
- Calibration and reference standards
- Use of reference tubes (notches, holes) and regular equipment calibration and verification are required.
- Personnel and qualification
- Operators and supervisors must be qualified per ISO 9712, ISO 11484 or equivalent; authorization and NDT level control are mandatory.
- Documentation
- The standard defines requirements for acceptance criteria, equipment checking, calibration, and test reporting.
Practical applications
- Quality assurance of welded steel tubes used in pipelines, structural sections, pressure components and general steel tube production.
- In‑line production inspection at tube mills for SAW and EW products.
- Component acceptance testing for manufacturers, independent inspectors, and end‑users requiring documented NDT of weld seams.
- Applicable where high‑throughput automated inspection is needed: oil & gas, construction, mechanical engineering, and transport industries.
Who should use this standard
- Tube manufacturers and mill quality engineers
- NDT managers and technicians (AUT / phased‑array practitioners)
- Third‑party inspection bodies and clients specifying weld seam integrity
- Design and procurement engineers needing NDT acceptance criteria
Related standards
- ISO 10893 series (Parts 1–12) - other NDT methods for steel tubes (radiographic, eddy current, full peripheral ultrasonic, etc.)
- ISO 5577 (NDT vocabulary), ISO 9712 and ISO 11484 (personnel qualification)
- ISO 10893‑6 / 7 (radiographic testing of weld seam), ISO 10893‑10 (full peripheral ultrasonic testing)
Keywords: EN ISO 10893-11:2011, automated ultrasonic testing, weld seam inspection, welded steel tubes, SAW, EW, shear wave, phased array, NDT, tube inspection.