ISO 13588:2019

Overview

ISO 13588:2019 - Non-destructive testing of welds - Ultrasonic testing - Use of automated phased array technology - specifies how to apply phased array ultrasonic testing (PAUT) for semi‑ or fully‑automated inspection of fusion-welded joints in metallic materials (minimum thickness 6 mm). It focuses on full‑penetration, simple‑geometry welds in plates, pipes and vessels where weld and parent material are low‑alloy and/or fine‑grained steel, and gives guidance for other steels. The standard outlines capabilities and limitations of phased array technology for the detection, location, sizing and characterization of weld discontinuities for manufacturing, pre‑service and in‑service inspection.

Key topics and requirements

• Scope and applicability: Automated PAUT for fusion welds ≥ 6 mm; not intended for certain production testing (see ISO 10893‑8, ISO 10893‑11, ISO 3183 exclusions). For coarse‑grained or austenitic steels, use ISO 22825 in addition.
• Testing levels: Four testing levels (A, B, C, D) are defined, each corresponding to a different probability of detection - used to match inspection rigor to quality requirements.
• Assessment criteria: Permits evaluation of discontinuities by amplitude (equivalent reflector size) and length, or by height and length. Note: ISO 13588 does not set acceptance levels.
• Equipment and verification: Addresses PAUT instrument, probes, scanning mechanisms, reference blocks and verification checks (clauses on equipment checks and reference reflectors).
• Procedure and personnel: Requires defined information before testing, written test procedures, personnel qualifications (referencing ISO 9712), and procedure qualification.
• Data handling: Specifies scan increments, data storage, interpretation and analysis of phased array images, plus methods to determine location, length and height of indications.
• Integration with other NDT: Phased array can be used alone or combined with other NDT methods (e.g., TOFD per ISO 10863) for improved characterization.

Practical applications and users

ISO 13588 is intended for:

• NDT engineers and technicians implementing automated PAUT systems for weld inspection
• Welding inspectors and quality managers in fabrication, petrochemical, pipeline, pressure vessel and power industries
• NDT service providers specifying test procedures, equipment checks and data reporting
• Asset owners and regulators wanting consistent inspection practice and traceable detection/sizing of weld flaws

Typical uses: manufacturing inspection, pre‑service acceptance checks, and in‑service inspections of welded components where reliable flaw detection and sizing are required.

Related standards

Key referenced standards to consult alongside ISO 13588:

• ISO 17640 (UT techniques & assessment)
• ISO 10863 (TOFD)
• ISO 18563‑1/2/3 (PAUT equipment characterization)
• ISO 19285 (PAUT acceptance levels)
• ISO 22825 (austenitic steels)
• ISO 9712 (NDT personnel qualification)
• ISO 5817, ISO 5577 (welding/NDT vocabulary)

Keywords: ISO 13588:2019, phased array ultrasonic testing, PAUT, weld inspection, non‑destructive testing, NDT, testing levels, weld flaw sizing.