New weld inspection system to boost rail safety

23 May 2013
By Edd Gent
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Because of rail welds’ complex structure it is difficult to check their strength and integrity beneath the surface

Because of rail welds’ complex structure it is difficult to check their strength and integrity beneath the surface

An ultrasonic device that tests the strength of rail track welds could “radically improve safety standards” on Europe’s railways.

Rail safety teams across Europe inspect tracks for any cracks or defects that could cause problems and if a track needs fixing it is often welded on-site, but the track inspectors have few tools to check whether the resulting welds are strong enough.

But now Railect, an EU-funded project, has built a testing device that clamps on to the rail before ultrasonic transducers inspect the weld and defect detection software crunches the data to seek deep, internal volumetric defects that cannot be seen with the naked eye.

“The system does a full volumetric inspection of the rail weld in less than 15 minutes and is very easy to operate because most of the operations are automated,” says Railect’s project coordinator Tamara Colombier, from TWI, a Cambridge-based research organisation.

“Because it gives an accurate position of the size and location of any weld defects, it could also reduce the very high rejection rate given by the visual inspection.”

Although they fix flaws on the rails, the welds themselves can suffer shrinkage, hot tears, slag inclusions, failure to fuse, and porosity.

Weld joint failures account for 20 per cent of all rail failures, but because of the welds’ complex structure, geometry and thickness, it is difficult to check their strength and integrity of the volume beneath the surface.

And as most checks are made with the human eye, a large number of welds with surface cracks are rejected even though they might be deeper inside.

There are an estimated 11 million welds on the European rail network, with around a thousand new ones added daily, but without new tools the rise in rail speeds, denser rail traffic, and heavier freight train weights are all likely to create more rail breaks across the European network.

“Now that the high speed network is expanding within Europe, the frequency of the inspection and maintenance has to be increased,” says Colombier. “Having a reliable, advanced and innovative system of inspection such as the Railect system will contribute to the establishment of a safer European railway network.”

Backed by a €1.1m grant from the European Commission, Railect’s partners – five from Britain, plus one each from Poland, France and Lithuania – have patented the technologies, and are working to bring it to market.

Network Rail, the authority responsible for the United Kingdom's railway network, has already indicated it will buy 40 Railect units.

Colombier says that beyond the obvious benefits for safety, the technology will also reduce maintenance costs on Europe's rail network, costs associated with the high rejection rates and by boosting the overall weld quality, it will ensure a smoother ride on passenger trains.

“Railect could radically improve safety standards all over Europe,” Colombier says. “And that can only be good for Europe’s railways.”

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