Welding reverse deformation calculation method

Abstract

The invention discloses a welding reverse deformation calculation method. The method comprises the following steps of: establishing two-dimensional geometric models of a temperature field and a deformation field of a to-be-welded workpiece according to a preset reverse deformation and a welding condition; establishing a heat conduction equation and a thermal elastoplastic control equation on the basis of the two-dimensional geometric models, physical performance and mechanical performance of the to-be-welded workpiece and a welding heat source; solving the solid-state heat conduction equationand the thermal elastoplastic equation on the basis of nonlinear finite element analysis software so as to obtain a temperature field and a welding angle deformation in the welding process; and finally determining a welding reverse deformation of the to-be-welded workpiece according to a preset reverse deformation, the welding angle deformation and a deformation target value. Compared with the traditional manners of carrying out analysis by utilizing three-dimensional models, the welding reverse deformation calculation method is capable of reducing the computational complexity of systems and ensuring the correctness of calculation results while obtaining welding reverse deformations of to-be-welded workpieces in an efficient and low-cost manner.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a method for calculating the reverse deformation amount of welding corner deformation. Background technique [0002] The welding process is actually a thermal process in which the local area of ​​the weldment is heated and then cooled and solidified. Therefore, during the welding process, since only the local area of ​​the weldment is heated and cooled, the temperature distribution of the weldment will be uneven, resulting in uneven expansion and contraction of the weldment, and welding stress will be generated inside the weldment. Welding deformation. [0003] Common welding deformations include longitudinal shrinkage deformation, transverse shrinkage deformation, angular deformation, bending deformation, twisting deformation, and wave deformation. Since the residual stress and residual deformation produced by welding seriously affect the quality, assembly accuracy and struct...

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Problems solved by technology

[0005] In view of the problem that there is no good method for predicting the amount of welding reverse deformation in the prior art, it is necessary to provide a method that can save time and cost and can quickly predict the amount of welding reverse deformation

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