| METALS AND METAL MATRIX COMPOSITES |
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| Analyzing the Influence of Laser Welding Parameters on the Welding Quality of 7075 Aluminum Alloy by Response Surface Methodology |
| DING Yaru1,2, CHEN Furong1, YANG Fan1, JIA Cuiling1
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1 School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China;
2 Mechanical and Electrical Technology, Inner Mongolia Vocational College, Hohhot 010051, China |
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Abstract The appearance quality (the form factor and the weld section area) of 7075 aluminum alloy welded joint was selected as evaluation indexes, response surface methodology was used to optimize welding parameters (the welding power, the welding speed, the defocusing amount and the shielding gas volume). The design of the four factor levels (the welding power, the welding speed, the defocusing amount and the shielding gas volume) were completed by using the design expert software. 7075 aluminum alloy plate with thickness of 3 mm was selected for fiber laser welding, and the depth of penetration, the width of weld and the weld section area were measured by stereo microscope and then calculated by the form factor. By means of response surface methodology, data simulation, modeling and comparison were conducted to select the best mathematical model and established the regression model. The prediction model was analyzed by anova, and the significance of each factor was determined, the three-dimensional response surface curve of the weld forming coefficient and the weld sectional area at the four factor level was obtained, the contour line was analyzed, 100 groups of factors level and the predicted results were simulated, and the optimum welding process was finally determined. The results showed that after the regression model was determined, the regression equation was tested with the horizontal median values of each factor. The results show that the measured values of molding coefficient and weld sectional area were closed to the predicted values. The predicted value of molding coefficient was 0.61% higher than the measured value. The predicted value of weld sectional area was 1.9% higher than the measured value. The better welding parameters is: the welding power is 2 300 W, the welding speed is 45 mm/s, the defocusing amount is 1 mm, the gas protection amount is 15 L/min. The weld forming coefficient under this parameter is 0.803, the weld cross-sectional area is 4.436 mm2, and the tensile strength is 325 MPa.
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Published: 28 January 2021
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| Fund:The National Natural Science Foundation of China (51765053), the Grassland Talents (DC1800007434), the Inner Mongolia Key Laboratory of Light Metal Materials, the Natural Science Foundation of Inner Mongolia Autonomous Region (2017MS0502). |
About author:: Yaru Ding, female, born in 1981, Ph.D., associate professor. Mainly engaged in aluminum alloy welding research work.
Furong Chen, female, the Mongol nationality, born in January 1972, doctor of engineering, professor at School of Materials Science and Engineering of Inner Mongolia University of Technology. In June 2002, graduated from the School of Materials Science and Engineering of Tianjin University and obtained a doctor’s degree in materials processing engineering. Awarded doctoral tutor in december 2004. Deputy director of the 10th Welding Mechanics and Structural Design and Manufacturing Committee of the Welding Society of China Mechanical Engineering Society, editorial board of Journal of Welding, vice chairman of Inner Mongolia Welding Society. Review experts of the National Natural Science Foundation of China. |
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2021, Vol. 35 
