Rail track NDT inspection is one of the ways how the current state of weld integrity can be assessed. Since half a century, radiographic examination of welds is a well-established technology that can provide a detailed report of the weld under inspection. Although several new inspection methods have emerged as an alternative method of inspection, the ability to examine the rail welds against flaws such as surface defects, sub-surface defects and internal defects buried in material leads a way forward for a customer to have greater confidence in radiographic approach.
Rail track welds, switch blades and fish bolts can all be examined with the Digital Radiography System. The technology is capable of examining components such as:
> Rail weld foot
> Middle web
> Rail head sections
The examination can be carried out within a short time span of 5 to 10 minutes per weld; the fastest inspection technique for weld and switch examination. Key defects like S transverse cracking can also be detected and corrective action can be in place to avoid major disasters.
The technology has been developed by using x-rays and CR Digital Radiography equipment. Previously used isotopes had presented problems of shipment. The x-ray radiography enables a more practical approach towards radiography. Digital Radiography, as it requires less dosage & exposure time becomes more cost effective and can move along the track to enhance productivity.