Method for obtaining the sensitivity of parameters to welding residual stress and deformation

Abstract

The invention relates to the field of welding, discloses an acquiring method of influence sensitivity of parameters on welding residual stress and deformation, and establishes a simulation model of the welding process of a welded joint. The method comprises the steps of selecting multiple performance arguments of a parent material, conducting experiments sequentially, and acquiring a parameter of each performance argument; adopting the parameter of each performance argument as a standard, and inputting multiple different parameter values within a set difference range of the argument into the simulation model sequentially; conducting the experiments again to acquire the parameter of a performance argument with the highest sensitivity, adopting the parameter of the performance argument with the highest sensitivity as the standard, and inputting multiple different parameter values within the set difference range of the performance argument with the highest sensitivity into the simulation model sequentially; comparing doublet characteristic curves corresponding to parameter changes of each performance argument, determining the performance argument with the highest sensitivity, and forming a close-loop analysis. The acquiring method of influence sensitivity of parameters on welding residual stress and deformation can establish a simulation database of core welding, improves the reliability of welding simulation, and reduces the cost of the testing experiments.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a method for acquiring the sensitivity of thermophysical and thermodynamic parameters to welding residual stress and deformation. Background technique [0002] By consulting textbooks or references, we know that many external characteristics are mainly affected by changes in the individual properties of materials: the peak value of the longitudinal welding residual stress of low-carbon steel weldments presents a unimodal distribution feature, and the unimodal peak value is close to the yield limit of the material; The peak value of the medium longitudinal residual stress is lower than its yield limit, showing a bimodal distribution feature; the main reason for the peak value of the longitudinal residual stress of aluminum alloy weldments is about 0.5 to 0.8 times the yield limit is the high thermal conductivity of the aluminum alloy material; the linear expansion coefficient It ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for obtaining the sensitivity of parameters to the influence of welding residual stress and deformation, so as to solve the problem that the simulation of internal relations such as residual stress distribution has not been paid attention to due to its complex mathematical model and slow effect.

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