An electrolytic copper foil uses titanium drums, which exhibit excellent corrosion resistance and can produce thin electrodeposited copper foils. The appropriate technology for producing thin copper foils is required as electronic products become lighter, thinner, shorter, and smaller. Thus, the importance of titanium drum manufacturing technology, which affects the specifications of electrolytic copper foils, is emphasized. In this study, thermo-elastic-plastic analysis is performed to select an appropriate range of welding process parameters for titanium drums. In addition, using a range of welding process variables derived from analysis, GBO and GPS algorithms, which are optimization algorithms, are developed to derive objective and restriction functions as well as to select the optimal algorithm.
Generally, an approximately 1% weight reduction in a 200 kg automobile improves the fuel economy by 20~26% and acceleration performance by 8%. Hence, various techniques for automotive lightweighting have been developed to satisfy environmental regulations of the automotive industry. The joining of dissimilar materials is critical for assembling lightweight body structures, but fusion welding is inapplicable owing to the difference in mechanical properties between materials. Thus, the development of an appropriate dissimilar material-joining process is required to produce high-quality joints. Self-piercing riveting is a representative joining process that is applied by pressure punching without prehole piercing. Operationally, this process is widely used for joining because it can produce joints with high shear strengths. However, the development of lighter and higher-strength materials indicates that the required force for SPR machines to form high-quality joints is increasing. Thus, high-speed E-SPR has been developed for joining ultrahigh tensile steels. In this study, SGAFC980/A5052-H34 was applied to the E-SPR process, and the joint characteristics were analyzed via cross-sectional analysis and shear strength tests. With an increase in the fastening speed, the interlock distance and the tensile shear load increased.
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