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Study of laser drilling mechanism parameters for a Ni-based superalloy | ||
| journal of kerbala university | ||
| Article 1, Volume 4, Issue 3, 2008, Pages 346-363 PDF (0 K) | ||
| Author | ||
| Methaq Mutter Mehdi Al-Sultany | ||
| Abstract | ||
| The time of laser drilling process for Hastelloy-x by using hybrid Ti:sapphire/KrF excimer chain laser has been calculated at different values of each ( number of shots , distance of sample from lens focus , intensity as well as fluence ) according to the establishment results of drill depth .Many parameters of laser drilling process have been calculated as heating stage time ( th ) , drilling velocity ( ds/dt) , temperature gradient (dT/dZ) , temperature of metal surface ( T ) and energy flux absorbed by the surface ( φEa ) at different values of photons intensity and in many different positions;infront of the lens focus and behined it . The laser drilling parameters have been calculated also by variation of ambient temperature ( T◦ ) according to one dimensional model of laser drilling . We found that ambient temperature (T◦)was more efficient parameter than laser photons intensity in laser drilling velocity and the metal position in front of the lens focus or behind it was not affect on most drilling parameters. It can be concluded that small divergence laser beam is adequate in laser drilling of metals | ||
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