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Journal of KWJS 2008;26(5):90-96.
Published online November 12, 2008.
Investigation of Cutting Characteristics in the Sharp Corner for the Case of Cutting of Inconel 718 Super-alloy Sheet Using High-power CW Nd:YAG Laser
Dong-Gyu Ahn, Kyung-Won Byun
Abstract
  The objective of this paper is to investigate the effects of the laser power, the material thickness, corner angles, and the loop size on the formation of the corner in the cutting of Inconel 718 super-alloy sheet using high-power CW Nd:YAG laser. In order to investigate the influence of corner angles and loop sizes on the melted area and the formation of corner in the sharp corner, angular cutting tests and loop cutting tests were carried out. The results of the angular cutting tests were shown that the melted area is minimized and the melting mode is changed from nose melting in the thickness direction to the secondary melting induced by the attached dross when the corner angle is 90°. Through the results of loop cutting tests, the variation of the melted area and the corner shape in the sharp corner according to the loop size were examined. In addition, it was shown that a proper loop size is approximately 3 ㎜. The results of above experiments will be reflected on the knowledge base to generate optimal cutting path of the laser.
Key Words: CW Nd:YAG laser, Inconel 718 super-alloy, Cutting characteristics, Corner angle, Melted area, Loop size


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