Abstract
Electrode degradation in the continuous resistance spot-welding process of baked hardening (BH) 220 steel was evaluated by an electrode life test, and weldability tests were conducted by geometry feature measurement, mechanical property analysis, and electrode diameter measurement with 88 or 176 weld intervals. The analysis of weld geometry shows that the heat-affected zone (HAZ) width, nugget diameter, and nugget area tend to decrease rapidly, while the nugget height tends to increase with the weld repetitions until the welding heat input becomes too small to form an effective nugget. The maximum displacement and failure energy of the welded joints show a decreasing trend during the welding electrode failure process, while the peak load increases slightly until the 88th weld and then decreases. The cavities and pores in the nugget mainly appear after the 176th spot weld. The electrode diameter increases during welding. The reason for the increase in electrode diameter may be that the contact area between the electrode and the BH 220 steel sheets becomes smaller in the welding process, which causes the continuous sticking phenomenon between the electrode and the BH 220 steel sheets. In the absence of alloying, the edge of the electrode is geometrically deformed, while Cu–Zn–Fe alloying occurs in the area in contact with the BH 220 steel sheet.
Funder
Russian Science Foundation
Subject
Inorganic Chemistry,Condensed Matter Physics,General Materials Science,General Chemical Engineering
Reference34 articles.
1. An investigation of the laser welding process for dual-phase steel via regression analysis;Zhao;IOP Conf. Ser. Mater. Sci. Eng.,2020
2. Mathiszik, C., Zschetzsche, E., Reinke, A., Koal, J., Zschetzsche, J., and Füssel, U. (2022). Magnetic characterization of the nugget microstructure at resistance spot welding. Crystals, 12.
3. Đurić, A., Milčić, D., Burzić, Z., Klobčar, D., Milčić, M., Marković, B., and Krstić, V. (2022). Microstructure and fatigue properties of resistance element welded joints of DP500 steel and AW 5754 H22 aluminum alloy. Crystals, 12.
4. High strength steel sheets for weight reduction of automotives;Funakawa;JFE Tech. Rep.,2019
5. A novel AE algorithm-based approach for the detection of cracks in spot welding in view of online monitoring: Case study;Yaacoubi;Int. J. Adv. Manuf. Technol.,2021
Cited by
5 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献