Creating Micro holes on the sheets is challenging in industries that could be achieved by using a laser. Laser drilling is performed by single pulse drilling, percussion drilling, helical drilling and trepanning drilling methods. A common method of drilling is Percussion Drilling. This study is focused on investigating the parameters of laser percussion drilling process of nickel-base superalloy Inconel 718 with thickness of 1 mm. Fiber laser with the wave length of 1070 nm was used as laser source. Laser power, laser pulse frequency and assist gas pressure were assumed as the laser drilling process variable parameters. Oxygen was used as assist gas. Optical microscope was used to investigate the geometrical features of the holes on the samples. The hole geometry features (hole entrance and exit diameters, circularity of hole entrance and hole exit circularity, and hole taper) were measured using imagej software. The results indicated that laser pulse frequency has a direct influence on the diameter of the entrance hole. Increasing the pulse duration leads to increases in hole taper. By increasing the laser power, entrance and exit hole diameter increased and hole taper increases. Holes with a diameter of about 300 to 700 micrometers created on the sheet.
