Parameters optimization of Ti6Al4V alloy welding by pulsed Nd:YAG laser

0579525 - FZÚ 2024 RIV DE eng C - Conference Paper (international conference)
Chmelíčková, Hana - Havelková, Martina - Hrubantová Písařiková, Aneta - Jílek, Vlastimil - Václavek, Lukáš
Parameters optimization of Ti6Al4V alloy welding by pulsed Nd:YAG laser.
Lasers in Manufacturing Conference 2023 - Proceedings. Mnichov: WLT, 2023, č. článku 149..
[Lasers in Manufacturing Conference (LiM 2023). Online (DE), 26.06.2023-29.06.2023]
R&D Projects: GA MŠMT LM2023032
Institutional support: RVO:68378271
Keywords : laser welding * Ti6Al4V * FEM model * nanoindentation * XRD analysis
OECD category: Materials engineering

The butt welds of thin Ti6Al4V alloy sheets using a pulsed Nd:YAG laser were investigated to determine the optimal value of peak power and pulse length for creating sound welds. The width of the weld face and the depth of penetration were found to be proportional to increasing peak power and decreasing pulse length. The weld surfaces were measured using a contact profilometer. The influence of laser pulse overlap on the thermal cycle in representative point and cross-section planes was demonstrated by a numerical model. Repeated melting and heating above the transformation temperature by previous and following pulses probably caused the occurrence of a mixed microstructure of α´martensite and massive α in the fusion zone and near the heat-affected zone. Nanohardness tests on the transverse cross-sections showed that the fusion zone was approximately 50% harder than the base material.
Permanent Link: https://hdl.handle.net/11104/0348479