Computed Radiography with Isotopes- Suitability for Weld Inspection
Computed Radiography (CR) is gaining importance in industries for inspection of welds and castings using x-rays. CR is preferred because of lesser exposure time, no chemical processing, lesser cost of consumables and advantage of a digital image output. It also allows archiving of digital images over many years, which is mandatory as per standards. Hence, Heavy engineering industries, manufactures of high-pressure boilers, Oil & Gas and Energy industries are interested to use Computed Radiography (CR) for testing weld integrity and corrosion monitoring of process pipes. These applications require radiography to be carried out using radioactive isotopes such as Se-75, Ir-192 and Co-60. However, industries do not have enough experience of using CR with isotopes. They require information on choosing the right isotope for different range of thicknesses of a material, in order to meet the ASME Section-V standards. It will also be helpful if there exists data on comparative performance of CR with respect to films on image quality.The authors have done extensive study at various engineering industries and characterized the performance of CR with isotopes. The image quality performances were studied using weld specimens with defects like lack of fusion; penetration, cracks, concavity, and porosities. This paper presents the quantitative metrics used for evaluation of CR specific to standards and comparative study of CR with various film systems.
Computed Radiography Isotopes Weld inspection
V. Manoharan Prasad Thapa Rajashekar Venkatachalam G.K.Padmashree Megha Navalgund Debasish Mishra
GE Global Research Center122,EPIP, White Field Road Bangalore-560 066, Karnataka, India
国际会议
第十七届世界无损检测会议(17th World Conference on Nondestructive Testing)
上海
英文
112-117
2008-10-25（万方平台首次上网日期，不代表论文的发表时间）