Non Destructive Testing of Laser Welded Lap Seams by Eddy Current Technique

Eddy current method has been tested for detection and classification of defects in laser welded seams. Influence of disturbance effects was investigated systematically. Before analysis data have been processed for consideration of changes in material properties. It can be shown that seam different defects lead to different characteristic indication ranges in the impedance plane. By investigation of samples with known defects a basis of valuation has been created. The application of this basis allows an experimental validation of industrial samples. The poster shows that by the help of eddy current technique detection and classification of defects in laser welded seams are possible. The results are in good agreement with reference methods such as radiography and metallography.