ISO 16826:2012 defines the principles for tandem? and longitudinal-longitudinal-transverse (LLT) wave?examination for the detection of discontinuities perpendicular to the surface.The general principles required for the ultrasonic examination of industrial products are described in ISO 16810. A list of symbols and equations is given in ISO 16811.The tandem? or LLT?examination should be used for the detection of planar discontinuities with distance to the surface greater than 15 mm. ISO 16826:2012 has been prepared for the examination of metallic materials with a thickness between 40 mm and 500 mm with parallel or concentric surfaces. It can, however, be used for other materials and smaller thickness provided special measures are taken.
ISO 16826:2012 defines the principles for tandem? and longitudinal-longitudinal-transverse (LLT) wave?examination for the detection of discontinuities perpendicular to the surface.
The general principles required for the ultrasonic examination of industrial products are described in ISO 16810. A list of symbols and equations is given in ISO 16811.
The tandem? or LLT?examination should be used for the detection of planar discontinuities with distance to the surface greater than 15 mm. ISO 16826:2012 has been prepared for the examination of metallic materials with a thickness between 40 mm and 500 mm with parallel or concentric surfaces. It can, however, be used for other materials and smaller thickness provided special measures are taken.
Le présent document définit les principes généraux du contrôle par les méthodes tandem et LLT (ondes longitudinales, longitudinales transversales) pour la détection des discontinuités perpendiculaires à la surface. Les méthodes conviennent pour détecter des discontinuités planes à au moins 15 mm de la surface et son application concerne les matériaux métalliques d'épaisseur comprise entre 40 mm et 500 mm ayant des surfaces parallèles ou concentriques.
Le présent document définit les principes généraux du contrôle par les méthodes tandem et LLT (ondes longitudinales, longitudinales transversales) pour la détection des discontinuités perpendiculaires à la surface. Les méthodes conviennent pour détecter des discontinuités planes à au moins 15 mm de la surface et son application concerne les matériaux métalliques d'épaisseur comprise entre 40 mm et 500 mm ayant des surfaces parallèles ou concentriques.
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.
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