Solving the problems of optimisation of technology by computer modelling of the welding process

摘要

The main problem of optimisation of technology is the minimisation of the probability of formation of welded defects. This problem can be solved in the stage of technology design by combining the computer modelling of the welding process with the statistical methods of evaluation of the probability of formation of the welded joint with the required quality parameters. When solving the problem of optimisation of technology, it is efficient to use computer models of the welding processes, based on the numerical solution of mathematical physics equations with the solution of the inverse problem of the calculation of the parameters for obtaining the welded joint with the required dimensions. The problem of calculating the welding parameters for obtaining the required values of several quality parameters may be solved by the method of inversion of the model of the welding process into a system of linear equations linking the quality parameters with the parameters of the process. The resultant linear equations restrict the range of the permissible parameters of the welding process. The possibility of formation of weld defects may be evaluated on the basis of the conventional theory of probability, simulation of the process with the variations of its parameters, and by evaluating the scatter of the quality parameters. Control of certain parameters can be justified by determining the allowances for these parameters by the inverse solution of the problem. 5 Analysis of the results of computer modelling for the deviations of the parameters of the welding process within the limits of the allowances makes it possible to find methods of improving welding technology and also justify the efficiency of application of the systems of automatic regulation and control and determine the control parameters.