Method to Obtain Inherent Deformation of Welded Joint Based on the Cutting Technique

doi:10.3901/JME.2020.08.092

Abstract

Abstract: Inverse analysis method based on the elastic finite element method and measuring technique is a new method to obtain the inherent deformations of a welded joint. However, when it is used to obtain the inherent deformation of the thin-plate welded joint made of lightweight structural materials such as aluminium alloy or high-strength steel, the tendency of geometric non-linearity occurring during the welding process is large, and convergence is often difficult in the reverse analysis process. Facing this problem, a improved method under the help of cutting technique is proposed to overcome the convergence problem caused by geometric non-linearity. In the current study, two thin-plate joints performed by tungsten inert gas welding (TIG) and melt inert gas welding (MIG) welding process respectively, which have complete different deformation modes, are taken as examples to obtain inherent deformations by the proposed method. Results show that the new method combining the cutting technique and the reverse analysis method can effectively obtain the inherent deformation of the thin-plate welded joint. Using the inherent deformations obtained by the new method, we accurately reproduce the welding deformations of two joints performed by TIG and MIG welding process, and match both the results predicted by thermal elastic plastic FEM and the experimental measurements.

Key words: cutting-method, inverse analysis, buckling distortion, inherent deformation

CLC Number:

TG404

LIANG Wei, SUN Xiaolu. Method to Obtain Inherent Deformation of Welded Joint Based on the Cutting Technique[J]. Journal of Mechanical Engineering, 2020, 56(8): 92-98.

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