Chenpeng Jia, Yiming Huang, Shengbin Zhao, Jiong Yuan, Feng Zhang, Lijun Yang. Plasma Plume Thermodynamic Behavior During Laser Deep-Penetration Welding of TC4 Titanium Alloy[J]. Chinese Journal of Lasers, 2023, 50(20): 2002105
- Chinese Journal of Lasers
- Vol. 50, Issue 20, 2002105 (2023)
Fig. 1. Schematic diagram of experimental equipment
Fig. 2. Schematic diagrams of passive electric probe device. (a) Side view; (b) top view
Fig. 3. Electrical signal waveform of the plasma under different heat inputs. (a) 75 J/mm; (b) 50 J/mm; (c) 37.5 J/mm
Fig. 4. Photoelectric synchronization signal of the plasma. (a) Electrical signal waveform of the plasma; (b)(c) electrical signal waveform of an plasma erupting period and its derivative waveform
Fig. 5. Variation of plasma erupting velocity with time under different heat input
Fig. 6. Probability density distribution of the plasma erupting velocity at different heat inputs
Fig. 7. Principle diagrams of the keyhole formation[17](a: molten-pool keyhole diameter; r0: laser spot radium; P0: atmospheric pressure). (a) Variation of Pabl and Pλ with the keyhole radius; (b)variation of ΔP with the keyhole radius
Fig. 8. Time difference detection schematic diagram of characteristic bands of electrical signal waves
Fig. 9. Probability density distribution of k at different heat inputs
Fig. 10. Schematic diagrams of sequence of the signal start to increase. (a) Lower probe ahead; (b) lower probe behind
Fig. 11. Probability density distribution of the lower probe ahead time at different heat input
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