Transient and Residual Stresses in Multi-Pass Welds
Search this Article
In order to examine the mechanical behavior of a multi-pass weld connection of a pressure vessel during welding (167 passes), theoretical and experimental investigations were conducted on an idealized research model. Theoretical thermal elastic-plastic analysis was carried out with the aid of a method developed by one of the authors, based on the finite element method. Theoretically predicted residual stresses show very good concidence with those obtained from the experiment, thus, the highest longitudinal stress always appears below the surface of the latest layer, and in theresidual stress distribution, the highest stress is produced several layers below the finishing bead in the midsection. Accordingly, when delayed cracking occurs, it initiates below the finishing bead and propagates to the surface.
- Transactions of JWRI
Transactions of JWRI 3(1), 59-67, 1974-02