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209 views Technical Discussions sandeep pawar sandeep pawar 06:39 Oct-04-2004 tofd hello friends, i am sandeep pawar, a final year mechanical enginerg student from india.as per the curriculum i am required to give a seminar on any topic.i have chosen "tofd" as my subject....i got many responses to my earlier message..thank u very much....after reading whatever material i had , i have a few doubts regarding this method.....plz those of you who have worked or are working on tofd ..i request u 2 help me...i would appreciate if u plz email me at....sandeepapawar@hotmail.com......... 1.what frequency waves are used? 2.how is the frequency decided? 3.with tofd , what is the max -min thickness which can be inspected? 4.once the waves are transmitted , they reach the discontunity where they get reflected as well as diffracted.how do we differentiate between reflected and diffracted waves? 5.sorry, but i didn't get...what exactly the purpose diffracted waves surve..i mean howz it different from the reflected waves?...does it really make so much of difference?... 6.whick discontinuties can be detected with TOFD?....7. 7.how are the discontinuties identified ?...i mean how do we know whether it's is a lof,crack,or a blow hole? 8.can tofd be implemented using present conventional UT setup? 9.where can i find more detailed information in this regard? 10.if any of u are from india..and u have any literature on this subject will u plz lend it to me? thank you very much.....plz email me at...sandeepapawar@hotmail.com                  Reply  Translate  Close   Product Spotlight ISAFE3 Intrinsically Safe Sensor System StandVallen-Systeme GmbH ISAFE3 intrinsically safe sensor system of Vallen Systeme is especially targeted at the petrochemica ... l - as well as oil and gas transportation industry. The sensor system is designed for permanent monitoring or periodic inspection tasks. Sensors are available for different AE-frequency ranges optimized for corrosion and fatigue crack detection and other applications. The ISAFE 3 sensor system consists of an AE-sensor (model ISAS3) certified according to ATEX/IEC for installation in zone 0, gas group IIC, IP68, 20 to +60 °C, and a signal isolator (model SISO3) certified for installation in zone 2. An ISAS3 sensor can be mounted in atmosphere or submerged, e.g. in water or crude oil. It is supported by mounting tools for temporary (magnets) or permanent (welded) installation. ISAFE3 supports automatic sensor coupling test and can be used with any AE signal processor supporting 28V supply at 90 mA peak, e.g. Vallen Systeme ASIP-2/A. > 2 Showcases Echomac® PA Rail Wheel Tester StandMagnetic Analysis Corporation MAC introduces two versions of Rail Wheel Testers using ECHOMAC® PA platform based on customer requ ... irements. > 4 Showcases4 Videos Swift & Scorpion2 - a state-of-the-art remote-control ultrasonic crawler StandSilverwing The Swift and Scorpion2 dry-coupled, remote-access ultrasonic crawler bring major efficiency and d ... ata improvements to tank shell inspections and other structures such as vessels and offshore installations. > 4 Showcases4 Videos Cygnus 6+ PRO Multi-Mode Ultrasonic Thickness Gauge StandCygnus Instruments Ltd The Cygnus 6+ PRO thickness gauge is the most advance gauge within the Cygnus range with key featu ... res including: comprehensive data logging; A-scan and B-scan display; manual gain control; Bluetooth connectivity; and much more. With its unique dual display and three measuring modes (Multiple-Echo, Echo-Echo and Single-Echo), this surface thickness gauge offers maximum versatility for inspections. > 5 Showcases5 Videos more Showcases Share... Home Exhibition Archive Forum Jobs Members Events Directory NDT A-Z Advertise Privacy Policy Contact About © NDT.net - Where expertise comes together. The Largest Open Access Portal of Nondestructive Testing (NDT)- since 1996 We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info Accept top this is debug window