الصفحات

Alexandria Engineeing Libraries

بحث هذه المدونة الإلكترونية

شرح طريقة تحميل الامتحانات من المدونة

الأحد، 23 مارس، 2014

Time of Flight Diffraction (TOFD) as a Substitute to Radiography in Inspection of Welded Joint: An Advanced Ultrasonic Test

Title  :   Time of Flight Diffraction (TOFD) as a Substitute to Radiography in Inspection of Welded Joint: An Advanced Ultrasonic Test
Author Ayman Nadim Abd El-Hamid Sherif
Collection M.Eng. Production
Abstract:  
Time of Flight Diffraction (TOFD) is a new ultrasonic NDT method which has been well established in many industrial countries, however in Egypt it is still knocking on the door. 
In this work a comprehensive review of TOFD covering many of its aspects, e.g. accuracy, coverage, resolution, reliability, and last not least the speed where the real value of TOFD is saving time. A review of the fundamental of ultrasonic inspection on which TOFD is based on had been carried out. A review of the most widely spread NDT method for inspection in Egypt, RT, has been introduced. 
TOFD technique is considered as one of the fastest methods of Non-destructive testing (NDT), the weld can be inspected with one single scan along its length. An experimental work has been carried out on carbon steel plate 22 mm thick, butt welded with a single V- groove joint was prepared by grinding, and this specimen was welded using a Shield Metal Arc Welding (SMA W) with E 7018-1 electrodes. An artificial defect was introduced into the specimen by drilling a whole 3mm diameter and 8mm deep in the weld metal. The specimen was inspected by both Radiographic Test (RT) and Time of Flight Diffraction (TOFD). Comparison between the results of inspection by TOFD and RT, show that RT reveals a projection of the defects not showing its length while TOFD show the defect in two dimensions. The results show the feasibility of using TOFD as an alternative to replace the traditional radiographic test (RT) method in inspection

ليست هناك تعليقات:

إرسال تعليق