Electromagnetic Self-Piercing Riveting (E-SPR) Process for Dissimilar Materials Joints

Automobile manufacturers have recently focused their research on the concurrent improvement of fuel efficiency and stability. To implement lightweight body structures, joining dissimilar materials, such as advanced high-strength steel (AHSS) carbon fiber-reinforced polymer (CFRP), is most important, whereas fusion welding, which conventional welding process, inapplicable owing to difference in mechanical properties between materials. Thus, development an appropriate material process utmost importance, considering productivity safety. Self-piercing riveting (SPR), a representative has no limitation terms applicable materials advantage improved joint strength. However, requirements industry are continuously increasing, there need further develop process. Therefore, this study introduces electromagnetic self-piercing riveting(E-SPR), that uses high electrical energy discharge charged capacitor working coil located head C-frame. In particular, enables high-quality parts be secured by improving formability with poor under strain rate. Consequently, simple piece E-SPR equipment was manufactured, Al/Steel Al/CFRP fabricated. The results preliminary test reported quality equal or higher than previously SPR joint. Based these results, studies processes for commercialization will conducted future.