Ablation drilling of invar alloy using ultrashort pulsed laser |
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Authors: | IL-Young Chung Jae-Do Kim Kyung-Ho Kang |
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Affiliation: | (1) Department of Mechanical Engineering, Inha University, 253, Yonghyundong, Namku, Incheon, Korea, 402-751 |
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Abstract: | Drilling a hole in Invar alloy is accomplished by using a nanosecond pulsed Nd:YAG laser. However, this process has a few problems, such as heat effect and poor edge quality. Therefore, the ablation properties of the Invar alloy were investigated by using an ultrashort pulsed laser, which is a regenerative amplifier Ti:sapphire laser with a 1 kHz repetition rate, a 184 fs pulse duration, and a 785 nm wavelength. To study the ablation characteristics of the Invar alloy, we measured the ablation shape, width, and ablated depth at the energy fluence of a single pulse. The optimal condition for hole drilling is a z-axis transfer depth of 4 μm, a circular feed rate of 0.2 mm/s, and a pulse energy of 26.4 μJ. A fine circular hole without burrs and thermal damage were obtained under the optimal processing conditions. The ultrashort pulsed laser system is an excellent tool for micro-hole drilling in Invar alloys without heat effects and poor edge quality. |
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Keywords: | Ultrashort pulse Ablation drilling Invar alloy Ti-sapphire laser |
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