Double-ellipse exponential decay body heat source model for simulating high-energy beam welding

Abstract

The invention provides a double-ellipse exponential decay body heat source model for simulating high-energy beam welding. Heat source model parameters can be adjusted according to the shape of an actual welded joint of high-energy beam welding, a high-energy beam welded joint shape consistent with the shape of the actual welded joint is efficiently and accurately acquired, a high-energy beam welding temperature field and a high-energy beam welding stress field can be accurately acquired, and a powerful measurement reference frame is provided for accurately predicting the stress and the deformation of a high-energy beam welding structure. The model can be used for popularization of high-energy beam welding simulation and hybrid welding simulation through adjustability of the inflection point positions in the model.

Description

【Technical field】 [0001] The invention relates to the technical field of welding numerical simulation, in particular to a high-energy beam welding heat source model, in particular to a double ellipse exponential decay volume heat source model for simulating high-energy beam welding. 【Background technique】 [0002] It is known that the innovation and progress of the manufacturing industry has attracted worldwide attention, and welding technology plays an irreplaceable role in national economic construction and social development; with the development of science and technology and the continuous increase of industrial demand, welding technology has Accounting for more and more weight, then the level of welding technology directly affects the quality of parts or products. Among them, the high-energy beam welding method is widely used in shipbuilding, automobiles, aerospace and other fields due to its advantages of fast welding speed, high production efficiency, high welding pre...

AI Technical Summary

Problems solved by technology

Due to the unequal energy distribution before and after the heat source, the double ellipsoid heat source can better reflect the energy distribution of the actual welding pool than the rotating body heat source, but because the energy in the penetration direction in the model adopts a Gaussian attenuation method , as the penetration depth increases, the energy becomes smaller and smaller. When the weldment is too thick, the energy near the back of the weldment is almost zero, so the double ellipsoid heat source model cannot reflect the keyhole penetration of high-energy beam welding of large-thickness workpieces effect

The combined heat source model can have the advantages of surface heat source and body heat source. It can not only characterize the shape of the molten pool, but also reflect the penetration effect of small holes. It has strong applicability. However, due to the variety of heat sources, which combination of heat sources is better? The effect is difficult to choose, and the energy distribution coefficient between heat sources is not easy to determine

[0006] From the analysis of the above heat source model, it is not difficult to see that although the heat source model of high energy beam welding has been continuously improved, the simulated weld shape and temperature field are getting closer to the actual situation, but the existing heat source model still needs to be improved. The accuracy of the beam welding heat source model has a direct impact on the calculation results of the temperature field and welding residual stress of the high energy beam welding structure. In order to obtain a more accurate temperature field during the welding process, it is urgent to establish a new high energy beam welding heat source model

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