| About this Abstract |
| Meeting |
2023 AWS Professional Program
|
| Symposium
|
2023 AWS Professional Program
|
| Presentation Title |
Characterization of Vibration Welded Wood |
| Author(s) |
David Grewell, Curtis Covelli |
| On-Site Speaker (Planned) |
David Grewell |
| Abstract Scope |
Wood can be vibration welded in a similar fashion as thermoplastics. This study investigated the factors affecting the welding of pine and maple planks. A Branson Mini II machine was used and the effects of weld pressure, amplitude, and weld time were varied to determine their effects on lap-shear weld strength. The highest strength of pine samples was 8.4 MPa, while maple was approximately 35% stronger and had a smaller standard error. The morphology of the weld zone was analyzed to gain insight into the welding mechanics. Molecular structural changes in the weld of pine and maple woods as well as maple-wood flash were investigated using quantitative solid-state 13C NMR, supplemented by 13C and 1H relaxation-based spectral editing. The NMR spectra also compared powdered weld material to pristine wood shavings. It appears that the mechanical decrystallization of cellulose due to grinding may have obscured the slight increase in cellulose crystallinity from friction welding. Therefore, cellulose crystallization appears to compose wood weld formation greater than previous studies concluded. |
| Proceedings Inclusion? |
Undecided |