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Copper has excellent electrical and thermal conductivity, good strength and formability. It also exhibits outstanding resistance to corrosion and fatigue. Due to these properties they are used in micro-electronics, robotics, printed circuit board, bio-medical equipments, etc. Laser beam machining is an advanced material processing technique which can be applied for almost all materials. Nowadays there is an increasing trends towards miniaturization of the various components, which requires micro-machining. Use of laser micro-drilling can be attributed to several advantages like high standard of finishing, high production rate, no mechanical damage or tool wear, low material wastage, low production cost, small heat affected zone and ecologically clean technology. In the present research work, 0.2 mm thick copper sheet is microdrilled by using Nd:YVO4 laser of maximum power 12 W. HAZ width has been investigated with respect to different processing parameters e.g. laser beam power, pulse frequency, scanning speed and number of pass. The results show that HAZ width increases with the increase of laser beam power throughout the range; it decreases first then increases with the increase of pulse frequency. Whereas, HAZ width increases initially but later decreases with the increase of scanning speed and number of passes. ANOVA and confirmation test has been performed to optimize the HAZ width. Keywords— Laser beam micro-drilling; copper sheet; HAZ width; ANOVA; confirmation test.

PARAMETRIC STUDY OF HEAT AFFECTED ZONE (HAZ) WIDTH IN LASER MICRO-DRILLING OF COPPER SHEET