Hole drilling of Inconel 718 by high intensity pulsed ultraviolet laser

摘要

Holes were percussion drilled in Inconel 718 plates by a high intensity pulsed ultraviolet laser (266 and 355 nm) with 8 ns pulse width. It showed that shortening the laser wavelength resulted in thinner recast layers, less microcracks, and faster machining speed. In order to get high quality and fast speed in laser hole drilling, a two-step processing method was proposed and tested.