| Autor: |
V. V. Semak, M. H. McCay, J. Murthy, R. E. Mueller |
| Rok vydání: |
1994 |
| Předmět: |
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| Zdroj: |
International Congress on Applications of Lasers & Electro-Optics. |
| Popis: |
The dynamics of the laser drilling process in Ti-6Al-4V was studied using a high speed photographic technique. Single pulse drilling was performed with a 1.06 μm Nd:YAG laser. The Nd:YAG laser beam was focussed at the interface between the alloy sample and a lmm thick glass plate that did not absorb 1.06μm wavelength radiation. The interaction zone was illuminated with an Argon ion laser from the glass side and the reflected beam was used to photograph the process. The process was recorded by high speed photography, both in the framing mode at a framing rate of 1 × 104 frames/sec and in the streak mode at a rate of 10μs/mm. Data obtained from these photographs was used to determine the drilling velocity.A hydrodynamic model of the laser drilling process was used to calculate the transient and steady state drilling velocities. The experimental values of the velocities were approximately 12 m/s in the transient and 1-1.5 m/s in the steady state and compared well with those predicted by the model. An attempt has also been made to estimate the time to reach steady state drilling velocity. In addition to the above investigation, a Schlieren (shadow) method was employed to study expulsion patterns of the molten metal from the hole.The dynamics of the laser drilling process in Ti-6Al-4V was studied using a high speed photographic technique. Single pulse drilling was performed with a 1.06 μm Nd:YAG laser. The Nd:YAG laser beam was focussed at the interface between the alloy sample and a lmm thick glass plate that did not absorb 1.06μm wavelength radiation. The interaction zone was illuminated with an Argon ion laser from the glass side and the reflected beam was used to photograph the process. The process was recorded by high speed photography, both in the framing mode at a framing rate of 1 × 104 frames/sec and in the streak mode at a rate of 10μs/mm. Data obtained from these photographs was used to determine the drilling velocity.A hydrodynamic model of the laser drilling process was used to calculate the transient and steady state drilling velocities. The experimental values of the velocities were approximately 12 m/s in the transient and 1-1.5 m/s in the steady state and compared well with those predicted by the model. An attempt... |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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