How the taper and heat affected zone can be minimized in laser micro drilling of super alloys with nanosecond pulsed laser
http://laser.mace.manchester.ac.uk/uploads/tx_neofileshare/2011-04-19_09-43-26_okasha1-2011.pdf
what is the aspect ratio of depth to diameter of the hole entry? compared to percussion drilling, trepanning may reduce tapper
Aspect ratio is 1:10
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