| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Light Metal Technology
|
| Presentation Title |
Investigating Hydrogen Porosity in Aluminum Laser Welding Using a Three-dimensional Cellular Automaton Model |
| Author(s) |
Nicole Trometer, Michael Moodispaw, Wayne Cai, Teresa J Rinker, Shardul Kamat, Zachary Velasco, Alan Luo |
| On-Site Speaker (Planned) |
Nicole Trometer |
| Abstract Scope |
Laser welding is used to weld commercially pure aluminum alloys for battery applications in the automotive industry. During welding, porosity is frequently present in the welds and is believed to be due to hydrogen entrapment. Laser welding is a high-temperature process, so hydrogen can dissolve into the aluminum weld pool. However, due to the low solubility of hydrogen in solid aluminum, the supersaturated hydrogen forms gas porosity in the welds during solidification. In addition, during welding of anodized aluminum, the anodized layer is broken up and causes oxide to be present. The oxide films can then act as heterogeneous nucleation sites for the gas porosity. The effect of aluminum oxide on porosity in aluminum welds was studied with LECO analysis of hydrogen content, scanning electron microscope, energy dispersive spectroscopy, and microcomputed tomography. A three-dimensional cellular automaton model was adopted that can simulate hydrogen porosity nucleation and evolution in aluminum welding. |