Method for predicting mechanical property of annular resistance spot-welding joint

Abstract

The invention relates to a method for predicting the mechanical property of an annular resistance spot-welding joint, and belongs to the technical field of resistance spot-welding. The method comprises the steps that the peak temperature is solved, wherein the peak temperature of a nugget area, a heat affected area and a base metal area of the annular resistance spot-welding joint is obtained through a finite element analysis method; material attributes are tested, wherein the material attributes of all the areas are obtained by adopting a thermal cycle simulation and experimental test methodaccording to the peak temperature of all the areas; a mechanical analysis model is established, wherein a finite element model of the annular resistance spot-welding joint is established; the finite element model is endowed with the material attributes, wherein corresponding grids of the finite element model are endowed with the material attributes of the nugget area, the heat affected area and the base metal area; and the mechanical property is solved, wherein accurate prediction of the failure mode and the mechanical property of the annular resistance spot-welding joint is achieved by simulating the experimental process of the mechanical property test through the finite element model. The method for predicting the mechanical property of the annular resistance spot-welding joint has the advantages of being low in test cost, high in speed and accurate in prediction result.

Description

technical field [0001] The invention relates to the technical field of resistance spot welding, in particular to the technical field of spot welding simulation, in particular to a method for predicting the mechanical properties of an annular resistance spot welded joint. Background technique [0002] The resistance spot welding process is widely used in automobiles, rail trains and aviation industries. Taking automobile connection as an example, each automobile will have 3000-5000 welding points in the manufacturing process to achieve high-strength connection between plates. Therefore, The weldability of resistance spot welding is very important. [0003] After the resistance spot welding experiences the coupling effect of the thermal and electric fields, the mechanical properties of the spot welding joints change significantly. Therefore, it is necessary to test the mechanical properties of the resistance spot welding joints to judge the weldability of the resistance spot w...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for predicting the mechanical properties of annular resistance spot welding joints, which solves the problems of high cost of resistance spot welding weldability testing, long cycle and inaccurate prediction results of traditional model prediction methods in the prior art.

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