16-05-2014, 10:48 AM
RED DYE PENETRANT
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WHAT IS RED DYE PENETRANT ?
It is a process used in railways to find cracks in parts of an engine. The chemicals which we use in this process are RED PENETRANT AND HIGHLIGHTER.
By using this technique we can find the cracks in microns, cracks which are very very small can be seen by using the magnifying glass.
PROCESS OF RPD TESTING
1.CLEAN THE SURFACE OF INSPECTION.
2. SPRAY THE RED PENETRANT ON SURFACE.
3. CLEAN THE SURFACE BY COTTON FOR REMOVING THE RED PENETRANT.
4. SPRAY THE WHITE SOLUTION ON SURFACE.
5. THE CRACKS WILL HIGHLIGHTED ON SURFACE.