Multi-objective optimization of resistance spot welding process parameters of ultra-high strength steel based on agent model and NSGA-Ⅱ

ZHUO Wenbo; TAN Guobi; CHEN Qiuren; HOU Zehong; WANG Xianhui; HAN Weijian; HUANG Li

doi:10.12073/j.hjxb.20230317002

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2024 > 45(4): 20-25. > DOI: 10.12073/j.hjxb.20230317002

ZHUO Wenbo, TAN Guobi, CHEN Qiuren, HOU Zehong, WANG Xianhui, HAN Weijian, HUANG Li. Multi-objective optimization of resistance spot welding process parameters of ultra-high strength steel based on agent model and NSGA-Ⅱ[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2024, 45(4): 20-25. DOI: 10.12073/j.hjxb.20230317002

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Multi-objective optimization of resistance spot welding process parameters of ultra-high strength steel based on agent model and NSGA-Ⅱ

ZHUO Wenbo^{1, 2,},
TAN Guobi²,
CHEN Qiuren^{2, 3, ,},
HOU Zehong²,
WANG Xianhui¹,
HAN Weijian^{2, 3},
HUANG Li^{2, 3}

1.
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, 210009, China
2.
Materials Academy Jitri, Suzhou, 215000, China
3.
Key Laboratory for Light-Weight Materials, Nanjing Tech University, Nanjing, 210009, China

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Received Date: March 16, 2023
Available Online: March 01, 2024

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Abstract

Abstract

In order to find the best welding process parameters for resistance spot welding of ultra-high strength steel, a three-factor and five-level flat plate lap spot welding experiment designed by orthogonal test method was carried out. With welding time, welding current and electrode pressure as adjustable process parameters, the nugget diameter, indentation depth, the tension-shear strength and spatter were used as the quality evaluation indicators of welded joints. Based on Gaussian process regression and BP neural network, a proxy model of the relationship between the process parameters and the quality evaluation indicators of welded joints was established. The training results showed that the accuracy of the model was very high. Finally, the multi-objective optimization was realized by using the genetic algorithm NSGA-Ⅱ with elite strategy and non-dominated sequencing, and the optimal pareto solution set between the evaluation indicators was obtained. The relative error value of each evaluation model was very small, which indicated that the optimization method had good prediction effect and stability. By using less experimental data, the method of establishing the optimization model had important guiding value for the selection of the best welding process parameters in resistance spot welding and other welding fields.

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References

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Multi-objective optimization of resistance spot welding process parameters of ultra-high strength steel based on agent model and NSGA-Ⅱ