Bilateral simultaneous friction stir welding process parameter optimization method

A process parameter optimization, friction stir welding technology, applied in manufacturing tools, welding equipment, non-electric welding equipment and other directions, can solve the problems of local optimization of numerical methods, complex process, insufficient theoretical support, etc., to achieve convenient and efficient process parameter optimization, Simple to use effects

Active Publication Date: 2021-11-02
TIANJIN UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of insufficient theoretical support, complicated process and local optimum of numerical method in the experimental method fo

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  • Bilateral simultaneous friction stir welding process parameter optimization method
  • Bilateral simultaneous friction stir welding process parameter optimization method
  • Bilateral simultaneous friction stir welding process parameter optimization method

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[0056] In order to further understand the invention content, characteristics and effects of the present invention, the following embodiments are enumerated hereby, and detailed descriptions are as follows in conjunction with the accompanying drawings:

[0057] See Figure 1 to Figure 4 , a double-sided simultaneous friction stir welding process parameter optimization method, based on the heat production mechanism of the friction stir welding process, the Fourier heat transfer law and the law of energy conservation, the heat production model of the double-sided simultaneous friction stir welding is established, and the process to be optimized is determined Parameters, taking the minimum input energy per unit length of welding as the objective function, setting constraints according to the welding process, and establishing an optimization model; using the sequential quadratic programming algorithm to solve the optimization model, and obtaining the optimal process parameter values...

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Abstract

The invention discloses a bilateral simultaneous friction stir welding process parameter optimization method. The method comprises the following steps of that a bilateral simultaneous friction stir welding heat production model is established based on a friction stir welding process heat production mechanism, a Fourier heat transfer law and an energy conservation law, the to-be-optimized process parameters are determined, and minimum welding unit length input energy is taken as an objective function, and constraint conditions are set according to a welding process, and an optimization model is established; and the optimization model is solved by adopting a sequential quadratic programming algorithm so as to obtain an optimal process parameter value. According to the method, based on the heat production mechanism of the welding process, the method is coupled with the SQP optimization algorithm, the global optimal input energy and the ptimal process parameter combination are obtained, and by means of the optimized parameters, the welding efficiency and the quality of a welded joint are improved.

Description

technical field [0001] The invention relates to a method for optimizing process parameters of friction stir welding, in particular to a method for optimizing process parameters of bilateral simultaneous friction stir welding. Background technique [0002] At present, compared with conventional friction stir welding, bilateral simultaneous friction stir welding has the advantages of producing symmetrical weld seam and heat input, improving production efficiency, and reducing the reaction torque on the fixture. In the friction stir welding process, heat is a key factor in determining the quality of the final weld, and it usually serves two main functions: (i) making the metallic material soft enough for the stirring head to form a solid weld, and (ii) causing microscopic Structural evolution, thereby affecting joint performance. Process parameters are the main factors affecting heat production. Research on process parameter optimization methods will help improve the quality o...

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Application Information

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IPC IPC(8): B23K20/12B23K20/26
CPCB23K20/122B23K20/26Y02T10/40
Inventor 刘海涛孟少飞倪雁冰肖聚亮黄田岳巍
Owner TIANJIN UNIV
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