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Investigation of movement of the melting front to analyse the formation of hole geometry during single pulse drilling with ND:YAG laser radiation

: Trippe, L.; Willach, J.; Petereit, J.; Kreutz, E.W.; Schulz, W.; Poprawe, R.

Laser Institute of America -LIA-:
ICALEO 2004, 23th International Congress on Applications of Lasers and Electro Optics. CD-ROM : October 4-7, 2004, San Francisco/Calif.
Orlando, Fla.: LIA, 2004 (LIA 97)
5 S.
International Congress on Applications of Lasers and Electro Optics (ICALEO) <23, 2004, San Francisco/Calif.>
Fraunhofer ILT ()

Single pulse drilling of micro holes (diameter 100 µm, depth < 2 mm) in stainless steel (X5CrNi18-10) and nickel-base superalloy (CMSX-4) is performed by pulsed Nd:YAG laser radiation (pulse duration 100-500 µs). The movement of the melting front is investigated by metallography and optical microscopy. The formation of the hole geometry is compared to the spatial and temporal distribution of the pulse power. The processing limits regarding the aspect ratio (diameter : depth) are expanded and the quality of drilled holes regarding resolidified melt in drilled holes, cylindricity, and defined conicity is extended.