For over the past 30 years Time-Of-Flight Diffraction (TOFD) technique of the UT method of NDT has been developed swiftly and has become an irreplaceable one when carrying out welded joints testing. TOFD assures a great accuracy for comfortable measuring the critical size of defects. The accuracy of better than ±1mm can be obtained in a wide range of material thickness.

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For several decades TOFD method has been widely used for fast and reliable UT of welded joints. TOFD offers great accuracy for measuring the critical size of crack-like-defects. The accuracy of better than ±1mm can be obtained in a wide range of material thickness.

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