Non-destructive evaluation of residual stresses in the multi-pass steel weldments

Erian, Gökhan
The purpose of this thesis is non-destructive determination of residual stress state in the multi-pass welded steel plates by Magnetic Barkhausen Noise (MBN) technique. To control the effectiveness of the developed procedure, continuous MBN measurements on the heat affected zone and parent metal of the welded plates were performed. In the experimental part, various steel plates were welded with different number of weld passes. Various series of samples were prepared for residual stress and for angular deflection measurements. Microstructural investigation and hardness measurements were also conducted. The results were discussed to evaluate the effectiveness of MBN measurements to monitor the changes in the residual stress state in the welded components as a function of weld pass number.