Method for analog calculation of welding value by taking temperature as control variable

Abstract

The invention relates to a method for analog calculation of a welding value by taking temperature as a control variable, which comprises the following steps: 1) arranging welding temperature field distribution into a function of time and space: T(x, y, z,t)=f(x)f(y)f(z)f(t); 2) taking the obtained temperature distribution function T(x, y, z, t)=f(x)f(y)f(z)f(t) as a thermology boundary condition to add into a mechanics analysis model of a welding structure in a subprogram form; and 3) calculating the welding residual stress and the residual deformation of the model. The method converts the control variable in the welding simulation from heat to temperature, adds the proper temperature distribution in a sectional mode onto the mechanical analysis model for the analysis of stress and deformation, and can reduce the mechanical value analyzing time within 10 percent of the time used by a moving heat source method. The method can be widely used for welding welded structures with long welding lines, multiple welding lines and multiple passes, and has very important function on promotion and reference in projects.

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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