| METALS AND METAL MATRIX COMPOSITES |
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| Acoustic Emission Signals Characteristics and Joints Strength Prediction During Weld Bonding of DP780 High-strength Steel |
| WANG Kaiwei, ZENG Kai, XING Baoying, YI Jinquan
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| Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650500, China |
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Abstract The orthogonal experiment of weld bonding was carried out for 1.2 mm thick DP780 high-strength steel sheet. The acoustic emission (AE) signals during the welding process were collected and analyzed. The relationship between strength of joints and characteristic parameters of AE signals was established. The results show that the three physical stages that are electrode loading, nugget nucleation and electrode unloading produce AE signals of three stages in the weld bonding process. Due to the burning and gasification of the adhesive layer in the weld bonding process, the AE count and positive peak are generated in the front stage of the nugget nucleation stage, which are greater than those generated in the resistance spot welding process. And the amplitude of AE signals increases with the spatter appearance; there is a good linear positive correlation between failure load and the AE count and positive peak without spatter, which can provide a basis for on-line inspection and control of welding quality during weld bonding.
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Published: 23 March 2021
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| Fund:National Natural Science Foundation of China (51565022). |
About author:: Kaiwei Wang, has studied at Kunming University of Science and Technology, and engages in the research of new sheet material connection technology and acoustic fault diagnosis theory and method.
Kai Zeng received his Ph.D. of mechanical enginee-ring. He is currently an associate professor in the School of Faculty of Mechanical and Electrical Engineering of Kunming University of Science and Technology. He is mainly engaged in the research of sheet materials joining technology and structural reliability design analysis, focusing on the process, mechanical properties and application research of resistance spot welding and self-piercing riveting. He has published more than 30 articles in important journals at home and abroad and won 5 national invention patents. |
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2021, Vol. 35 
