This study presents a comparison between contact and immersion ultrasonic method to measure welding residual stress of austen-itic stainless steel plates (AISI 304L). Longitudinal critically refracted (LCR) waves are employed to measure the residual stresses. By using contact and immersion transducers, a 3D distribution of longitudinal residual stress for the entire of the welded plate is presented. A finite-element model of welding process, which is validated by the hole-drilling method, is used to verify the ultrasonic results. The results show no considerable differences between using contact or immersion transducers in ultrasonic stress measurement of stainless steel plates; however, some practical considerations are mentioned.
- contact ultrasonic stress measurement
- finite-element welding simulation
- immersion ultrasonic stress measurement
- welding residual stress