ICALEO 2008 Paper #310 (Laser Drilling in Superalloy with 150~550Ns Pulse Train)
Laser Drilling in Superalloy with 150~550Ns Pulse Train
Authors:
Xiaobing Zhang, beijing aeronautical manufacturing technology research institute; Beijing Peoples Republic of China
V.A. Serebrjakov, Institute for Laser Physics; St. Petersburg Russia
M.V. Volkov, Institute for Laser Physics; St. Petersburg Russia
Presented at ICALEO 2008
This paper introduces the principle and characteristics of an AO Q-switched YAG laser of 100-700ns single pulse duration working in pulse train mode which has been developed specially for making holes with thinner recast. The laser oscillator is composed by a low power AO Q-switched YAG laser of TEM00 mode as seed laser and two amplifie...$28.00
ICALEO 2008 Paper #309 (Aerospace Applications of Precision Trepanning)
Aerospace Applications of Precision Trepanning
Authors:
Paul Jacobs, LFI Inc.; Smithfield RI USA
Presented at ICALEO 2008
In a companion paper Precision Trepanning with a Fiber Laser, analytical constraints were developed leading to criteria for optimal trepanning of very precise holes. That paper also includes recent documented test data verifying these calculations. In this paper, we utilize these optimal fiber laser trepanning results to show the potentially substantial benefits that can accrue for relevant aerospace applications. Specifically, the jet engine selected for the Joint Strike Fighter will require over 1.2 million film cooling holes to operate at the elevated temperatures...$28.00
ICALEO 2008 Paper #308 (Investigation on the Pulsed Nd:YAG Laser Drilling of IN718)
Investigation on the Pulsed Nd:YAG Laser Drilling of IN718
Authors:
Joonghan Shin, CLAIM, The University of Michigan; Ann Arbor MI USA
Jyoti Mazumder, CLAIM, The University of Michigan; Ann Arbor MI USA
Presented at ICALEO 2008
We report on an experimental study of the pulsed Nd:YAG laser drilling of IN718 for cooling holes in aero-engine components. The holes produced in this study are angled at 30o to the workpiece surface and were mainly produced by a spiral drilling technique. The design of experiment (DOE) using the Taguchi method was employed, and various process parameters such as laser power, drilling speed, assist gas pressure, focal position and a number of drilling passe...$28.00
ICALEO 2008 Paper #307 (Acoustic Monitoring of Percussion Drilled Holes for Gas Turbine Engine Components)
Acoustic Monitoring of Percussion Drilled Holes for Gas Turbine Engine Components
Authors:
Robert Wright, Connecticut Center for Advanced Technology; East Hartford CT USA
Christopher Pinciak, University of Massachusetts-Dartmouth; MA USA
Terri A. Marsico, Connecticut Center for Advanced Technology; East Hartford CT USA
Paul Denney, Connecticut Center for Advanced Technology; East Hartford CT USA
Amber Black, University of Connecticut; CT USA
Presented at ICALEO 2008
Percussion laser drilling is used to produce cooling holes in gas turbine engine components. Inconsistencies associated with pre-drilling operations make it difficult to cons...$28.00
ICALEO 2008 Paper #305 (Laser Drilling with Gated High Power Fiber Lasers)
Laser Drilling with Gated High Power Fiber Lasers
Authors:
John Washko, Connecticut Center for Advanced Technology; East Hartford CT USA
Paul Denney, Connecticut Center for Advanced Technology; East Hartford CT USA
Terri A. Marsico, Connecticut Center for Advanced Technology; East Hartford CT USA
Presented at ICALEO 2008
Flash-lamp pumped Nd:YAG lasers are presently used to percussion drill film cooling holes in gas turbine engine components. These lasers are the most popular lasers for cooling hole drilling because their characteristics result in acceptable processing times and microstructures. These lasers are used to drill through a wide range of material types an...$28.00
ICALEO 2008 Paper #303 (Precision Trepanning with a Fiber Laser)
Precision Trepanning with a Fiber Laser
Authors:
Paul Jacobs, LFI Inc.; Smithfield RI USA
Presented at ICALEO 2008
An analysis is developed to establish the optimal parameters for precision trepanning using a 200 watt average power fiber laser. Recent test results are also presented to document the mean values and standard deviations of fiber laser trepanned holes for a number of materials, hole diameters, and thicknesses. Analytical constraints are established for each of the following: (1) maintaining sufficient laser irradiance to assure rapid trepanning speed without inducing plasma self-absorption, (2) selecting a laser pulse repetition frequency sufficiently high to maintain a molten met...$28.00
ICALEO 2008 Paper #302 (Investigation of the Laser Drilling Process by Emission Spectroscopy)
Investigation of the Laser Drilling Process by Emission Spectroscopy
Authors:
Robin Bright, University of Connecticut; Storrs CT USA
Harris Marcus, University of Connecticut; Storrs CT USA
Mark Aindow, University of Connecticut; Storrs CT USA
Presented at ICALEO 2008
Pulsed laser drilling has recently become of increasing importance to the aerospace industry as a method of creating cooling holes in a variety of high temperature gas turbine engine components. The potential for improved processing speed, accuracy, and reproducibility compared to conventional machining methods make laser drilling attractive from both an economic and product quality standpoint. Previous ...$28.00
ICALEO 2008 Paper #301 (Influence of Process Gas Sort and Pressure on Laser Percussion Drilling)
Influence of Process Gas Sort and Pressure on Laser Percussion Drilling
Authors:
Kurt Walther, Lehrstuhl Fuer Lasertechnik, Rwth Aachen University; Aachen Germany
Christian Holtkoetter, Lehrstuhl Fuer Lasertechnik, Rwth Aachen University; Aachen Germany
Ingomar Kelbassa, Lehrstuhl Fuer Lasertechnik, Rwth Aachen University; Aachen Germany
Reinhart Poprawe, Lehrstuhl Fuer Lasertechnik, Rwth Aachen University; Aachen Germany
Presented at ICALEO 2008
Providing the technology to achieve an efficiency of 65 % in natural gas-fired combined cycle power plants is the aim of the German Collaborative Research Center 561 Thermally highly loaded, porous and cooled m...$28.00
ICALEO 2008 Paper #2107 (Studies of Thermal Distortion and Residual Stresses of an Inconel 718 Part Fabricated by the Laser Powder Deposition Process)
Studies of Thermal Distortion and Residual Stresses of an Inconel 718 Part Fabricated by the Laser Powder Deposition Process
Authors:
Huan Qi, Ge Global Research; Schenectady NY USA
Byungwoo Lee, Ge Global Research Center; Niskayuna NY USA
Yan Gao, Ge Global Research Center; Niskayuna NY USA
Magdi Azer, Ge Global Research; Niskayuna NY USA
Presented at ICALEO 2008
Laser powder deposition is essentially a thermal process involving rapid phase changes and high temperature gradients. Thermal stresses generated during rapid cooling have critical impacts on the geometric accuracy and material properties of a laser deposited part. Thermal control is critical for...$28.00
ICALEO 2008 Paper #2106 (Laser Net Shape Manufacturing of Rene195)
Laser Net Shape Manufacturing of Rene195
Authors:
Yong Liu, GE; 0 CO Peoples Republic of China
Presented at ICALEO 2008
Rene 195 is a nickel-based superalloy that was used as the advanced tip material of the high pressure turbine blades of aircraft engines because of its excellent oxidation resistance. However, due to poor weldability of this material, it's very difficult to acquire crack free Rene 195 tip through laser powder deposition. In this paper, Laser Net Shape Manufacturing (LNSM) has been applied for Rene 195 deposition. The key processing parameters were correlated with solidification microstructure and optimized process window was obtained for crack free deposition.
In order to imp...$28.00
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