Technical gazette, Vol. 17 No. 1, 2010.
Preliminary communication
Analysis of geometrical characteristics of pulsed ND:YAG laser drilled holes in superalloy Nimonic 263 sheets
Sanja Petronić
; Innovation Centre, Faculty of Mechanical Engineering, University of Belgrade, Kraljice Marije 16, Belgrade, Serbia
Anđelka Milosavljević
; Faculty of Mechanical Engineering, University of Belgrade, Kraljice Marije 16, Belgrade, Serbia
Zoran Radaković
; Faculty of Mechanical Engineering, University of Belgrade, Kraljice Marije 16, Belgrade, Serbia
Predrag Drobnjak
; Politechnical Academy, Belgrade, Serbia
Igor Grujić
; Simens d.o.o. Belgrade, Omladinskih brigade 21, Belgrade, Serbia
Abstract
Owing to their excellent mechanical and physical characteristics, superalloys are the most suitable material for use in hot sections of aircraft engines. Thousands of holes need to be drilled in constructive parts of machines, with laser technique emerging as the most effective. Laser drilling has been used to produce small diameter, accurately positioned holes, with little damage in regions around them, and in various materials. Effective laser employment of drilling of high quality holes for critical applications highly depends on correct selection and optimization of laser drilling parameters. In this work, the holes were drilled by a pulsed Nd3+:YAG laser, with maximum average power of 160 W, in superalloy Nimonic 263 sheets, thickness 0,7 mm and 1,2 mm. The holes were observed by optical and scanning electron microscope. Geometrical characteristics of laser drilled holes that depend on laser parameters were investigated and analysed. The aim of this investigation was to find optimal laser parameters which would produce as much as possible regular holes.
Keywords
drilling; laser; Nimonic 263 superalloy
Hrčak ID:
50608
URI
Publication date:
31.3.2010.
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