About this Abstract |
Meeting |
2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
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Symposium
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2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
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Presentation Title |
Adaptive Feedforward Laser Power Control Based on FEM Simulation for Stable Bead Deposition in Laser-Wire DED |
Author(s) |
Jisu Han, Sunghun Ji, Kiwook Nam, Dongseok Kang, Jongcheon Yoon, Simo Yeon, Durim Eo, Jaeho Shin, Hyub Lee |
On-Site Speaker (Planned) |
Jisu Han |
Abstract Scope |
Laser-Wire Directed Energy Deposition (LW-DED), with near-100% material deposition efficiency, often experiences process instability during prolonged deposition, caused by bead geometry inconsistencies that enlarge the deviation between the designed and actual working distance due to heat accumulation.To address this issue, we proposed a FEM simulation-based feedforward laser power control method. The method was tested on three geometries: a cylinder, a truncated cone narrowing upward, and a truncated cone widening upward. In the truncated cones, melt pool monitoring results showed inconsistent trends with weak correlation to the degree of heat accumulation, limiting the effectiveness of feedback-based control. In contrast, the FEM-based feedforward strategy enabled reliable prediction of thermal accumulation in advance and allowed pre-setting of laser power for each layer. Validation results confirmed that the proposed method maintained uniform melt pool geometry and kept the working distance within the design window across all shapes. |
Proceedings Inclusion? |
Planned: Post-meeting proceedings |