Influence of External Restraint on Welding Distortion of Aluminum Alloy Thin-plate Structures

doi:10.3901/JME.2021.06.070

Abstract

Abstract: The purpose of this paper is to illustrate the effect of external constraints on the welding deformation of thin-plate panel welding structures based on the numerical simulation results. In this study, the welding deformation of aluminum alloy (A6061) thin-plate structure with different thickness was simulated by the computational procedure combining the thermal elastic plastic finite element method(FEM) with the elastic FEM based on the theory of inherent strain. The thermal elastic plastic FEM was used to calculate the inherent deformation of typical joints in the thin-plate structure in the first step, and the elastic FEM based on the theory of the inherent strain is used to calculate the overall deformation of the thin plate structure in the second step. The result obtained from the thermal elastic plastic FEM shows that the external constraint has a little influence on the longitudinal shrinkage force (Tendon Force), a certain influence on the transverse shrinkage, and a significant effect on angular distortion of T-joint. The result calculated by the elastic FEM indicates that the external constraint can effectively reduce the out-of-plane deformation of the thin-plate welded structure when buckling deformation does not occur, while it cannot prevent the unstable deformation of the thin plate welded structure when buckling distortion happens.

Key words: welding deformation, buckling distortion, inherent strain, numerical simulation, aluminum alloy

CLC Number:

TG404

LIANG Wei, ZHENG Ying, DENG Dean. Influence of External Restraint on Welding Distortion of Aluminum Alloy Thin-plate Structures[J]. Journal of Mechanical Engineering, 2021, 57(6): 70-77.

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