| About this Abstract |
| Meeting |
2024 AWS Professional Program
|
| Symposium
|
2024 AWS Professional Program
|
| Presentation Title |
Accurate Measurement of Defect Size and Morphology in Laser Welded Aluminum Alloys
|
| Author(s) |
Abhirup Saha, Jeffrey Rodelas, Michael Maguire, Tarasankar DebRoy, Todd Palmer |
| On-Site Speaker (Planned) |
Todd Palmer |
| Abstract Scope |
Beam deflection tools have been investigated as a means for mitigating the formation of keyhole collapse porosity during the laser welding of aluminum alloys. In order to determine the efficacy of different beam oscillation parameters, accurate measurements of the porosity levels are needed, but they have been hindered by the use of two-dimensional optical microscopy-based techniques which capture single longitudinal or transverse cross sections. With the emergence of x-ray computed tomography tools, internal porosity can be characterized in three dimensions across the entire weld volume, vastly increasing the accuracy of porosity measurements and allowing the location and morphology of individual defects to be obtained. When comparing porosity measurements obtained using these tools, two-dimensional microscopy tools underestimated the porosity by 50 to 80%. These conventional two-dimensional methods are also unable to accurately characterize the morphology of irregularly shaped pores. Using three dimensional tools, however, allows the irregular shapes to be captured. By categorizing the pore shapes using a Zingg’s shape analysis, the differentiation of disk, rod, and spherical pores was quantified. |
| Proceedings Inclusion? |
Undecided |