Numerical Prediction of Welding Hot Cracking using Three-Dimensional Fem with Temperature Dependent Interface Element
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The Finite Element Method (FEM) is a powerful tool to predict welding residual stresses and distortions. However, it is impossible to analyse the hot cracking with a simple thermal-elastic-plastic FEM code, since the conventional FEM models only volumetric behaviour. Based on the interface element proposed for the cracking propagation problem, a three-dimensional FEM with a temperature dependent interface element has been developed. The proposed method is applied to the analysis of the pear-shaped bead cracking under narrow gap welding as one example of hot cracking in welding. Both the pear-shaped bead cracking and the surface cracking along the welding line can be simulated using the proposed method. Also, it is found that the heat input, the groove width, and the constraint under the solidification are the essential causes of the pear-shaped bead cracking.
IIW-Thesaurus keywordsFinite element analysis Computation Prediction Hot cracking Cracking Defects Narrow gap welding Temperature Energy input Interfaces Reference lists Influencing factors
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