An inverse analysis method to estimate inherent deformations in thin plate welded joints

Weld-induced distortion occurs as an unavoidable consequence due to the intrinsic nature of non-uniform heating and fast cooling. Welding distortion not only negatively affects manufacturing accuracy, but also increases fabrication cost due to straightening work. Past researches suggest that elastic finite element method based on inherent strain theory is an effective approach to estimate welding deformation for welded structures. However, when this method is used to simulate welding deformation in a large or complex structure, the values of inherent deformations in each typical joint must be known beforehand. In the present study, a new method based on inverse analysis was developed to obtain the inherent deformations in typical welded joints. Meanwhile, the influence of weld length on welding deformation was investigated. In addition, using the proposed method, a database of inherent deformations in thin plate butt joints was established.