A Welding Numerical Simulation Calculation Method Using Temperature as Control Variable

Abstract

The invention relates to a welding numerical simulation calculation method using temperature as a control variable, comprising the following steps: 1) organizing the distribution of the welding temperature field into a function of time and space: T(x, y, z, t)=f(x )f(y)f(z)f(t); 2) the obtained temperature distribution function T(x, y, z, t)=f(x)f(y)f(z)f(t) as Thermal boundary conditions are added to the mechanical analysis model of the welded structure in the form of a subroutine; 3) Calculation of the welding residual stress and residual deformation of the model. The invention changes the control variable in the welding simulation from heat to temperature, and adds the appropriate temperature distribution to the mechanical analysis model in a segmented form to analyze the stress and deformation, which can reduce the mechanical numerical analysis time of structural welding to only Within 10% of the time taken by the moving heat source method. The invention can be widely used in welded structures with large weld seam length, large quantity and many passes, and plays an extremely important role in engineering popularization and reference.

Description

technical field [0001] The invention relates to a numerical simulation calculation method in the field of welding, in particular to a welding numerical simulation calculation method suitable for analyzing welded structures with large length, large number and many passes, with temperature as the control variable. Background technique [0002] General welding numerical simulation is widely used in the field of welding processing, but due to the serious inhomogeneity of the welding temperature field, the simulation contains a large number of highly nonlinear and large-scale matrix calculations, and its low efficiency seriously hinders the actual production application. In the welding process, the distribution of the welding temperature field is a key link, which affects the plastic strain of the material being welded, and then affects the residual stress and deformation of the structure. The traditional welding numerical simulation usually adopts the moving heat source method,...

AI Technical Summary

Problems solved by technology

The traditional welding numerical simulation usually adopts the moving heat source method, which applies the welding heat to the welded area in a certain distribution form according to the welding parameters and the characteristics of the welding pool, and the heat source moves forward gradually along the weld seam at the actual welding speed, so when When the number of welds is large, the efficiency of numerical simulation will be extremely low

In the past, some studies have used the segmented heat source method to improve the efficiency of welding simulation calculations, but the control variable in this method is heat, and the process involves a large number of extremely complicated thermal equivalent calculations. The control of the temperature field is poor, and the accuracy of the calculation results is not high

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