|About this Abstract
||Materials Science & Technology 2019
||Joining of Advanced and Specialty Materials XXI
||Effect of Surface Roughness on Bonding Behavior of Steel and Ni by Ultrasonic Welding
||Shoichi Nambu, Jheyu Lin, Toshihiko Koseki
|On-Site Speaker (Planned)
Ultrasonic welding (USW) is a solid-state bonding technique available in bonding steels and other metals. To understand the effect of roughness on the evolution of bonding strength, pure Ni and IF steel having different surface roughness were employed. It is found that when smooth bonding surfaces by mirror-polishing are utilized, a rapid evolution of bonding strength could be obtained because of extensive formation of contact areas. When bonding surfaces become rougher, the evolution of bonding strength is retarded at the early stage of USW, which can be attributed to the presence of rough peaks, leading to a lower fraction of contact area and concentrated clamping stress. As sufficient contact areas are produced at a longer welding time, the rapid increase of bonding strength is obtained correspondingly.