A sequence scheme to reduce the residual stresses in welding of circular elements

Accurately predicting welding residual stresses and developing a convenient welding sequence for a weld system is an appropriate task since welding residual stress is inevitably produced in a welded structure. In this work, the effect of layered, block and cascade welding sequences on the thermo-mechanical response of shell weldments is studied by use of a 3-D thermo-viscoplastic model. An Anand model is used to simulate the rate dependent plastic deformation of welded materials. At the same time, modeling of the welded region in the present study has been done on the basis of the isothermal melting poolapproach. The temperature dependency of the thermal and mechanical properties of materials is considered in the analysis and the effect of the welding speed and welding lag, and the inter-pass temperature is introduced into the model as well. Thus, the model presented here has provided a convenient welding sequence to enhance the fabrication process of a circular weld