NF EN ISO 16826, A09-335 (03/2025)

ISO 16826:2012 defines the general principles of monitoring using tandem and longitudinal and longitudinal-transverse (LLT) wave techniques for the detection of discontinuities perpendicular to the surface. The general principles of ultrasonic testing of industrial products are described in ISO 16810. The list of symbols and equations is given in ISO 16811. Tandem testing or LLT should be used to detect planar discontinuities located more than 15 mm from the surface. This International Standard has been developed to control metallic materials with a thickness between 40 mm and 500 mm, and having parallel or concentric surfaces. However, it can be used for other materials and lower thicknesses, provided that specific measures are taken.
(Automatic translation from French)