engleski

Numerical simulation of high-efficiency one pass welding process in thick steel plates considering hardening effects

In recent years, there has been a tendency to increase the efficiency of existing welding processes. This is most commonly done by achieving higher molten metal deposition rates, which is extremely important for welding steel structures of significant thickness. The buried-arc methodology allows the welding of plates up to 30 mm in thickness by only using one pass. There is a lack of data on the applicability of this relatively new welding method and is necessary to investigate this procedure experimentally and numerically. Numerical simulations are increasingly used for predicting residual stress distributions and could replace expensive experimental measurements in the future. In this paper, a prescribed temperature approach was used in order to reduce model preparation and computation time. The obtained results are compared to the previous work of authors using the constant heat flux method for simulating heat input during welding. The influence of strain hardening on residual stress distribution was considered by using bilinear isotropic and kinematic hardening models.

structural steel ; strain hardening ; plasticity models ; D-Arc welding ; thick plates

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