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ISO 16826:2025

Non-destructive testing — Ultrasonic testing — Testing for discontinuities perpendicular to the surface

Mar 5, 2025

General information

60.60     Mar 5, 2025

ISO

ISO/TC 135/SC 3

International Standard

19.100  

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Scope

This document specifies principles for the tandem technique and the longitudinal-longitudinal-transverse wave (LLT) technique for detection of discontinuities perpendicular to the surface or almost perpendicular to the surface.
The general principles for ultrasonic testing of industrial products are described in ISO 16810.
The tandem or LLT techniques can be used for the detection of embedded planar discontinuities.
This document gives guidelines for the testing of metallic materials with a thickness between 40 mm and 500 mm with parallel or concentric surfaces.
The procedures provided in this document can be used for testing of other materials or smaller thickness if special measures are taken according to a written testing procedure.
Phased array techniques can also be applied for the tandem technique and the LLT technique, but additional steps or verifications can be needed.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 16826:2012

NOW

PUBLISHED
ISO 16826:2025
60.60 Standard published
Mar 5, 2025

National adoptions

SRPS EN ISO 16826:2025  
ISS

Non-destructive testing - Ultrasonic testing - Testing for discontinuities perpendicular to the surface (ISO 16826:2025)

60.60   Standard published

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