부산대학교 도서관

Connecting two metals by welding creates specific artifacts - Heat Affected Zone (HAZ) - in the material. There is a need for detecting these regions at high speeds in many industrial sectors, such as sheet metal processing. We propose a method based on eddy current testing for detecting the HAZ without contact between the surface and the sensor/probe. Differential eddy current probes are suitable for this application due to the significant change of probe parameters in the region with the welding artifacts. Simulations based on the finite element method were used to improve the geometry and parameters of the probes. We discuss custom-designed probes, which were simulated, manufactured, and evaluated. For testing purposes, the moving sheet metal testbed was designed and created. The system demonstrates the potential of eddy current-based detection and custom-designed probes as a reliable and efficient solution for detecting welding artifacts at high speed.