NDT210 — Time of Flight Diffraction (TOFD)
3 , 3 lecture periods 0 lab periods Provides basic knowledge of time of flight diffraction (TOFD) consistent with other methods, and to acknowledge TOFD as unique enough to warrant an additional body of knowledge and qualification requirement. Demonstrate proficient knowledge of the application of TOFD in industry. Demonstrate proficient knowledge of how to set up and calibrate NDT equipment. Demonstrate proficient knowledge and a basic understanding of weld inspection using TOFD. Outline: Introduction Terminology of TOFD History of TOFD Responsibilities of level of certification Basic Principles of TOFD Review of ultrasonic wave theory, refracted longitudinal waves Introduction to TOFD concepts and theory Technique limitations Equipment Computer based systems Beam profile tool Probes Wedges Scanners Testing Techniques Line scanning single tandem probe setup Line scanning multiple probe setup Raster scans Standardization Material velocity calculations Combined probe delays calculation Digitization rates Signal averaging Pulse width control PCS and angle selection Sensitivity Preamplifiers Effects of curvature Data collection Single probe setups Multiple probe setups Nonencoded scans Encoded scans Probe offset and indexing Procedure Specific applications Material evaluations Weld inspections Detection and evaluation of weld flaws Detection and evaluation of in-service cracking Detection of volumetric loss Geometric limitations Cladding thickness and integrity evaluations Compl
Prerequisites: NDT206