期刊
JOURNAL OF MANUFACTURING PROCESSES
卷 64, 期 -, 页码 30-44出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jmapro.2020.12.004
关键词
Laser welding; Aluminum-lithium alloy; Optical spectroscopy; Ensemble learning; Extreme gradient boosting; Feature reduction
资金
- National Natural Science Foundation of China [51605372, 51775409]
- China Postdoctoral Science Foundation Funding [2018T111052, 2016M602805]
- Program for New Century Excellent Talents in University [NCET-13-0461]
This paper investigates the regression prediction of laser welding seam strength of aluminum-lithium alloy in rocket storage tanks using optical spectrum and XGBoost, proposing a novel regression model RFPCA-XGBoost with the best performance regarding R2 value of 0.9383 among all methods tested.
This paper studies the regression prediction of laser welding seam strength of aluminum-lithium alloy used in the rocket storage tank by means of the optical spectrum and extreme gradient boosting decision tree (XGBoost). First, the relationship between the spectrum intensity and the seam strength coefficient is thoroughly investigated through parameters changing experiments using the developed monitoring system of the optical spectrum. Then, the importance of the metal line spectrum, including Al I, Li I, and Mg I, is quantitatively evaluated, and good complementarity between the Random Fores(RF)t and Principal Component Analysis(PCA) is demonstrated. Finally, a novel regression model, e.g., RFPCA-XGBoost is proposed and is compared with other different feature selection methods, tree-based ensemble learning models and grid search parameters optimization, and the comparison results show that among all the methods, the proposed model has the best performance regarding the R2 value, achieving the R2 value of 0.9383.
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