Non-Destructive Testing of Metals and Alloys – Photofluoroscopy
Posted by mechlook info on December 25th, 2011 08:24 PM | No Comment
Photofluoroscopy. It combines some of the advantages of both radiography and fluoroscopy. In this case a permanent record is made and film cost is considerably reduced. But this method has its limitations of fluorscopy regarding sensitivity and inspection of low ...
Non-Destructive Testing of Metals and Alloys – Fluoroscopy
Posted by mechlook info on December 23rd, 2011 08:36 PM | 1 Comment
Fluoroscopy. Fluoroscopy makes use of certain chemicals such as zinc sulphide, barium platinocyanide and calcium tungstate which fluoresce when acted on by X-ray radiation. These materials are distributed on card-board or similar material to make a screen and absorb part ...
Non-Destructive Testing of Metals and Alloys – Gamma Radiography
Posted by mechlook info on December 23rd, 2011 08:36 PM | No Comment
Gamma Radiography: Principle of detecting defects is the same as X-ray radiography.
Gamma rays are emitted during the disintegration of radioactive material and like X-rays are electromagnetic radiation. Gamma-rays are of shorter wavelength and consequently are more penetrating. The chief ...
Non-Destructive Testing of Metals and Alloys – Ultrasonic Inspection
Posted by mechlook info on December 23rd, 2011 08:36 PM | No Comment
Ultrasonic Inspection
Introduction. Ultrasonic is the general subject of sound whose frequency is above the upper pitch limit of the human ear. Ultrasonic frequencies are generally considered to range from 15 kilocycles per second upwards.
In the metals field, ultrasonic testing and ...
Non-Destructive Testing of Metals and Alloys -Non-magnetic Methods of Non-destructive Testing
Posted by mechlook info on December 23rd, 2011 08:36 PM | No Comment
Non-magnetic Methods of Non-destructive Testing
Several effective non-magnetic methods for inspecting both magnetisable and non-magnetisable materials have been recently developed.
(a) Zyglo, fluorescent method is most suitable for detecting surface cracks, minute holes and season cracks in metals like ceramics, glass and ...
Non-Destructive Testing of Metals and Alloys -Electrical Method
Posted by mechlook info on December 22nd, 2011 11:23 PM | No Comment
Electrical Method
A number of electrical methods have been employed in non-destructive inspection and testing of machinery and wide variety of metallic materials and parts of dimensional inaccuracies and physical defects. The method consists of measuring the electrical resistance of the ...
Non-Destructive Testing of Metals and Alloys -Electrical / Magnetic Methods
Posted by mechlook info on December 22nd, 2011 11:15 PM | No Comment
Electrical / Magnetic Methods
Electrical and/or magnetic tests are used for detecting differences in composition, condition, dimension and the presence of defects. These methods are based on the characteristics (relationships) between electrical/magnetic, properties and the constitution of alloys.
An instrument based upon ...