Achievement method for predicting laser welding deformation

Abstract

Provided is an achievement method for predicting laser welding deformation. The geometrical morphology of a weld pool zone after welding is acquired, a finite element model and a heat source three-dimension scanning model consisting of a Gaussian surface heat source and a Gaussian body heat source are established, then heat source parameters are fit, coupling parameters in the non-complete coupling process are identified, a finite element model of a workpiece to be connected in production is established, the heat source three-dimension scanning model and the coupling parameters are loaded, finite element simulating calculation is performed, and finally the predicted deformation of the workpiece to be connected is obtained. The accuracy of temperature field calculation is improved, the accuracy of deformation prediction is improved, and the prediction time of the welding deformation is greatly shortened.

Description

technical field [0001] The invention relates to a technology in the field of laser welding, in particular to a method for realizing the prediction of laser welding deformation. Background technique [0002] The laser welding process has gradually begun to be widely used in the joining process of automobile body panels. It has the advantages of high automation, fast welding speed, deep welding penetration, and high joint strength, but it is also accompanied by problems such as welding deformation and residual stress. The deformation caused by laser welding often exceeds the assembly tolerance of the body panel, which has a great influence on the assembly accuracy. Contents of the invention [0003] The present invention aims at the defect that the existing technology cannot control the shape of the molten pool area of ​​the weld seam by defining the wire grid profile, cannot accurately fit the shape of the molten pool area at the weld seam, and has poor welding deformation ...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the defect that the existing technology cannot control the shape of the molten pool area of ​​the weld seam by defining the wire grid profile, cannot accurately fit the shape of the molten pool area at the weld seam, and has poor welding deformation simulation effect, and proposes a predictive laser welding method. The realization method of deformation amount improves the accuracy of temperature field calculation, improves the accuracy of deformation prediction, and greatly reduces the time of welding deformation prediction

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