Nondestructive Inspection of Welds on Pipe Using Scan-type Magnetic Camera

This paper presents a nondestructive testing of damages on welding lines of pipe using a flexible linearly integrated Giant magnetoresistance (GMR) sensor array (FLGiS). 32 GMR sensor elements were arrayed in a flexible probe at an interval of 1.5 mm. The flexibility of sensor helps to minimize lift-off while scanning the welding lines. The sensor measures residual magnetic density in the welding line to detect the existing of residual stress or damages. Thus, there is no need the supplement of external magnetic field.


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