The Examination of Optimal Focus Settings with Material Thickness at Atmospheric and Subatmospheric Pressures of Air and Oxygen in Laser Drilling of Metals
Restricted accessReview articleFirst published online May, 1988
The Examination of Optimal Focus Settings with Material Thickness at Atmospheric and Subatmospheric Pressures of Air and Oxygen in Laser Drilling of Metals
Previous statistical examination of relevant factors in laser drilling has shown that the focal settings, material thicknesses and drilling ambient pressure had a significant effect on the resultant hole geometry, but left open the question of which combination of factors gives optimum drilling. Consequently, the present work examines the optimum focal settings with material thicknesses at atmospheric and subatmospheric ambient pressures of air and oxygen for different materials. The results obtained show that the optimal setting reduces as material thickness increases at all ambient pressures.
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References
1.
YilbasB. S.Heat transfer mechanisms initiating the laser drilling of metals. PhD thesis, Department of Mechanical Engineering, University of Birmingham, 1981.
2.
YilbasB. S.YilbasZ.Factorial analysis of laser drilled holes in Nimonecs 75. CLEO 1987 (Conference on Lasers and Electrooptics), Baltimore Convention Centre, Baltimore, Maryland, 27 April–1 May, 1987.
3.
YilbasB. S.A study of affecting parameters in the laser holedrilling of sheet metalsJ. Mech. Working Tech, 1986, 13, 303–315.
4.
ShaylerP. J.Laser drilling phenomenon including beam/vaporised material interactions. PhD thesis, Department of Mechanical Engineering, University of Birmingham, 1975.
5.
YilbasB. S.The study of laser produced plasma behaviour using streak photographyJapan J. Appl. Phys, 1985, 24, (11), 1417–1420.
6.
YilbasB. S.YilbasZ.Plasma transients during laser drilling in subatmospheric pressure atmospheres of airOptics and Lasers in Engineering, 1986, 7, 1–13.
7.
YilbasB. S.The absorption of incident beam during laser drilling of metals. Optics and Laser Tech, Feb. 1986, 27–32.
HodgmanC. D.Handbook of chemistry and physics, 1953 (Chemical Rubber Publishing Company, USA).
10.
YilbasB. S.Heating of metals at a free surface by laser irradiation—an electron kinetic theory approachInt. J. Enging Sci, 1986, 24, (8) 1325–1334.
11.
YilbasB. S.The study of plasma behaviour during pulsed laser drilling at different drilling medium and pressures. J. Turkish Science (Engineering and Research Council), 198610 (2), 89–96.
