About this Abstract |
Meeting |
Advances in Welding and Additive Manufacturing Research 2022
|
Symposium
|
Advances in Welding and Additive Manufacturing Research 2022
|
Presentation Title |
Characterization of Bonding in Joints Produced by Cold Spray |
Author(s) |
Kaiqiang Wu, Rong Gen Neo, Sung Chyn Tan, Wei Zhou |
On-Site Speaker (Planned) |
Kaiqiang Wu |
Abstract Scope |
Cold spray is an additive manufacturing technology that deposits metallic materials in solid state. Since the depositing temperature is much lower than melting point of the materials, there is limited phase transformation and thermal stress, making cold spray suitable for joining dissimilar or non-weldable metals. Bonding in joints produced by cold spray can be characterized using optical and scanning electron microscopes to identify voids or other defects between the deposit and the substrate. Actual value of the bonding strength can be measured by traditional glue method developed for thermal spray techniques. However, if glue failure occurs before the rupture of the joints, bonding strength achieved by cold spray can be underestimated. In this study, Inconel 625 was deposited on Aluminum 6061 by cold spray for improving the wear and corrosion resistance. The material combination can lead to detrimental intermetallic compounds if joined by fusion-based technology. Three different methods (i.e., mini tensile test, lug shear test, and blade shear test) were attempted to measure the bonding strength of the cold sprayed joints. The tensile strength of the joint was measured to be around 1.5 times of the value measured by glue method (usually around 60 MPa). Observation of the fracture surface after mini tensile test revealed that mechanical interlocking made major contribution to the bond strength. The shear strength of the joint measured by lug shear test was also much higher than strength of the glue. The fracture surface was featured not only by shear but also by pealing. Blade shear test turned out to be unsuitable for the bonding strength measurement due to excessive bending of the samples. The research helps to identify the most suitable methods for measuring bonding strength of joints produced by cold spray. |
Proceedings Inclusion? |
Undecided |