About this Abstract |
Meeting |
2020 AWS Professional Program
|
Symposium
|
2020 AWS Professional Program
|
Presentation Title |
Additive Manufacturing Using Semi-solids |
Author(s) |
Patricio F. Mendez, Chris S. Rice, Stuart B. Brown |
On-Site Speaker (Planned) |
Patricio F. Mendez |
Abstract Scope |
Semi-solid metals are an ideal candidate for the additive manufacturing of large scale metallic parts. They share the advantage of WAAM in that each layer is of the order of millimeters; however, semi-solids present the additional advantage of lower heat added, with much potential for reducing distortion. Another advantage is that the thickness of a layer is can be controlled by the apparent viscosity of the slurry, allowing for thicker builds for very large components, such as marine propellers. In contrast, WAAM (as well as all welding techniques) are limited in maximum bead size to what can be held by capillary action. A significant challenge of semi-solids for additive manufacturing is that they do not stick to the previous layer deposited. This is because the layer interface temperature is intermediate between that of the previous layer and that of the new layer, and that intermediate temperature typically falls in the fully solid regime. For this reason, a very high chamber heat or a preheat mechanism is needed to accomplish adhesion. Challenges and strategies will be discussed to obtain semi-solids and to accomplish effective bonding. |
Proceedings Inclusion? |
Definite: Other |