About this Abstract |
| Meeting |
2025 AWS Professional Program
|
| Symposium
|
2025 AWS Professional Program
|
| Presentation Title |
Marangoni Flow Development of a Weld Penetration Model Using Truchas-PBF |
| Author(s) |
Cheryl Hawk, Lindsay O'Brien, Zach Jibben |
| On-Site Speaker (Planned) |
Cheryl Hawk |
| Abstract Scope |
Predicting depth of penetration in austenitic stainless steels has been a known challenge due to the Marangoni effect, which alters the fluid flow direction. The Marangoni effect can cause some challenges in maintaining weld penetration requirements, specifically if the same weld needs to be produced in different heats of stainless steel. Weld modeling can help to identify if parameters need to change from heat to heat to ensure penetration depths meet requirements. Here, Truchas-PBF is leveraged to build up weld modeling capabilities. The work presented shows a unique behavior that is observed experimentally and confirmed in modeling efforts. Depth of penetration was measured for welds made with a positive and negative defocused laser that were also produced at various laser powers. The negative defocus produced a spike in penetration depth at a moderate laser power that was not observed in the positive defocus condition. The Truchas-PBF model includes a temperature-dependent surface tension model that captures this phenomenon and helps to explain why this phenomenon exists. |
| Proceedings Inclusion? |
Undecided |