MET_309_Lecture__12_11_28_06

MET_309_Lecture__12_11_28_06 - MET 309 Nondestructive...

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Unformatted text preview: MET 309 Nondestructive Testing & Quality Assurance Lecture #12 (Radiographic Inspection & Test #3 Review) November 28 th 2006 Notes taken directly from: Nondestructive Testing for Aircraft. by: Douglas C. Latia ISBN# 0-89100-415-7 & www.NDT-ED.org Chapter #6 Radiographic Insp. X-rays were discovered in 1895 by Wilhelm Conrad Roentgen. Professor at Wuerzburg University in Germany. Cathode ray tube In many ways, radiography has changed little from the early days of its use. We still capture a shadow image on film using similar procedures and processes technicians were using in the late 1800's. The use of X-ray for inspection came about in the 1920s. Inspection of heavy castings. Radiographic Inspection The need for increased reliability in aircraft parts and assemblies contributed greatly to the refinement of this technique during WWII. Since then, the images have increased in resolution and electronic recording devices have been made. Radiographic inspection of a structure is recommended if the suspected structural area is hidden or not easily accessible. Principles of Radiography X-rays and gamma rays are very short wavelength electromagnetic radiation which have the ability to penetrate material opaque to visible light. The radiation passes through the material. The radiation is absorbed or attenuated to varying degrees which is dependent on the: Material Thickness Density Atomic Number Absorption of the radiation is used to render information that is recorded on a film. Principles of Radiography Radiation is passed through the object being inspected and produces an invisible image on the film. The film must be processed in order to produce a radiograph. A radiograph is a shadow picture of an object very similar to a black and white negative. More radiation passes through the thin sections of the object. The more radiation on the film, the darker the radiograph image. The radiograph can be interpreted using a master guide. Radiography Limitations Radiation travels in straight lines and must intercept the film at a right angle....
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This note was uploaded on 08/25/2009 for the course MET MET309 taught by Professor Biekert during the Fall '06 term at ASU.

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MET_309_Lecture__12_11_28_06 - MET 309 Nondestructive...

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