Pulsed Nd: YAG laser drilling of aerospace materials (Ti-6Al-4V)
| Autor: | W J Yahya, Sundar Marimuthu, N D Bahar |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0209 industrial biotechnology
Engineering drawing Heat-affected zone Materials science Drill business.industry Drilling 02 engineering and technology 021001 nanoscience & nanotechnology Laser law.invention chemistry.chemical_compound 020901 industrial engineering & automation Optics chemistry law Yttrium aluminium garnet Nd:YAG laser Laser power scaling 0210 nano-technology business Laser drilling |
| Zdroj: | IOP Conference Series: Materials Science and Engineering. 152:012056 |
| ISSN: | 1757-899X 1757-8981 |
| Popis: | This paper studies the influence of Nd:YAG (neodymium-doped yttrium aluminium garnet) laser process parameters on laser drilled hole quality. Ti-6Al-4V of 1 mm and 3 mm thickness were used as the workpiece substrate. The principal findings are mainly based on minimising the taper angle in laser drilled holes, reducing the heat affected zone and reducing the production of spatter. Identification of key process variables associated with laser drilling process is accomplished by trial experimentation. Using the identified key process variables, further experiments were then performed with the assistance of statistical design of experiment (DOE) to find the interaction and individual effects of various laser process parameters on laser drilled hole quality. The lowest taper angle of 1.8 degrees was achieved with use of nitrogen as the assist gas. Furthermore, from the laser process observations, it was found that laser power significantly affects the quality of the laser drilled hole. Increase in laser power would increase the hole size and result in more spatter on the entry hole surfaces. The nozzle focus position substantially influenced the laser drilled hole size. The amount of spatter deposits increased with decrease in the nozzle offset. Increase in laser frequency significantly increased the exit diameter, which resulted in smaller taper angle. Number of pulse required to drill through a workpiece depends on the material properties and physical properties of the material. For 1mm Ti-6Al-4V, a minimum of two pulses was required to successfully removed the material during drilling and a minimum of 4 pulses was required to drill through the same material with 3mm thickness. |
| Databáze: | OpenAIRE |
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