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Nondestructive Testing of Welding Defects in a Tubular-Type Transmission Tower using Magnetic Imaging with Magnetic Sensor Array

This research introduces a nondestructive testing technique using a magnetic sensor array for inspection of welding defects in a tubular-type transmission tower. Magnetic sensors are used to measure the weak residual magnetic field from stress concentration zones and welding defects. Three components of the magnetic field were measured using a hall effect sensor and a giant magnetoresistance (GMR) sensor. The vertical component, which is perpendicular to the weld surface, was found to be the most effective component. Consequently, a linear-type integrated hall sensor array, which has 64 hall effect sensor elements, was produced to measure the vertical component of the magnetic field. The effectiveness of the inspection results was then verified by ultrasonic testing techniques.

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