About this Abstract |
Meeting |
2021 AWS Professional Program
|
Symposium
|
2021 AWS Professional Program
|
Presentation Title |
Application of Interlayer Technology during Resistance Spot Welding of Advanced High Strength Steels |
Author(s) |
Liya Amanuel, Bryan Lara, Rafael Giorjao, Antonio J. Ramirez |
On-Site Speaker (Planned) |
Liya Amanuel |
Abstract Scope |
The automotive industry has an increased interest in producing a vehicle structure that is both lightweight and upholds safety standards. This is in an effort to reduce both fuel costs and vehicle related emissions while maintaining great crash performance. In order to satisfy these requirements, advanced high strength steels (AHSS) have been an important candidate material for these types of applications due to their ability to offer both improved strength and ductility. But challenges arise when resistance spot welding of these materials in terms of weld strength and toughness due to how thin these sheets are. This study investigated the implementation of different interlayer alloys to improve the weldability of USIBORŪ 2000 using both a low carbon and nickel interlayer. These interlayers acted to change the weld composition locally in an attempt to improve the weld integrity. All samples were subjected to mechanical and metallurgical analysis. It was found through tensile shear and cross tension testing that all material combinations resulted in a pull-out button mode (PF). When comparing the two interlayers, the nickel interlayer performed best mechanically. But of all the material combinations, the no interlayer weld configuration resulted in the best mechanical performance. Metallurgical analysis revealed that the existence of a notch is inherent to the interlayer method which acts as a crack initiation site. Future work related to this exploratory effort include investigating different methods of adding an interlayer and expanding the selection of interlayer alloys. |
Proceedings Inclusion? |
Definite: Other |