Evaluation of Residual Stresses and Their Influence on Distortion in the Decoiling and Welding Processes

摘要

An analysis of de-coiling process is provided. The expression for equilibrium of internal stresses within de-coiled plate during welding was established. First simulations of the de-coiling process have been prepared using Finite Element Modeling technique. Experimental verification of numerical results has been performed. The experimental results are in very good agreement with the numerical results. More insight into the changes of the sample material during deformation was achieved by careful microstructural examination. The microhardness measurements were proposed as a new and fast method of indicating the position of the neutral plane within de-coiled plate. Based on literature review and results of performed analysis a set of general rules for assembling a large structure by welding from de-coiled plates was proposed. Based on that set it will be possible to predict de-coiled plate distortion during welding.