Y-joint inspection

By Frédéric REVERDY, Business Development Manager in M2M

A while back we had a post about a T-joint inspection with GEKKO. We just received a nice carbon steel Y-joint from Sonaspection with three defects inside. Today we are going to look at the laminar tear underneath one of the fillet welds. In GEKKO it is possible to define this component and to position the probe on any of its surfaces. We position the probe along one of the surfaces of the web plate. The first line shows a Sscan obtained when no defect is present. We can see that there is a strong echo. By reconstructing the Sscan after reflexion we can see that this echo is perfectly aligned with the backwall of the flange making it very easy to interpret. The second line shows the laminar tear. The Sscan shows several echoes that might be hard to interpret without the overlay of the Y-joint. By looking at the same data with the reflexion off the other side of the web plate it is possible to position correctly the laminar tear and part of the backwall. 


The below video shows the inspection of a Y-joint manufactured by Sonaspection with 3 defects (toe crack, laminar tear and LOP). We use a 5L64 probe with T55 wedge positioned on one of the surfaces of the web plate, we encode the data with a simple wire encoder. With the support of the profile of the Y-joint and the possibility to represent the data after reflexion, it is possible to detect and characterize all the defects. This is also available with our new portable system, MANTIS. 



#M2M #Gekko #Capture #Mantis #Yjoint #Ysection #Fillet #weld #joint