PROCEEDINGS. of the LASER MATERIALS PROCESSING CONFERENCE ICALEO'98. LIA Volume 85 CO-CHAIRS:

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1 PROCEEDINGS of the LASER MATERIALS PROCESSING CONFERENCE ICALEO'98 LIA Volume 85 CO-CHAIRS: Eckhard Beyer, Fraunhofer-Institute Fur Werkstoffphysik, Dresden, Germany Xiangli Chen, GE Corporate R&D, Schenectady, New York, USA Isamu Miyamoto, Osaka University, Osaka, Japan Published by the LIA Laser Institute of America Research Parkway, Suite 125 Orlando, FL UB/TIB Hannover X

2 Table of Contents Part 2 Section D - Surface Processing and Film Deposition Enhancement of Material Surface Properties by Pulsed Laser Deposition (Session 13: Surface Processing & Film Deposition I) Larry R. Dosser, Carl J. Kershner, Mound Laser and Photonics Center, Inc., Miamisburg, OH; P.T. Murray, Research Institute, Univ. of Dayton, Dayton, OH Section D-l Laser Remelting of Plasma Sprayed Coatings (Session 13: Surface Processing & Film Deposition I) Section D-5 K.L. Wang, DepL of Mechanical Engineering, Tsinghua Univ., Beijing, P.R. China; William M. Steen, Dept. of Mechanical Engineering, The Univ. of Liverpool, Liverpool, U.K.; Y.M. Zhu, Faculty of Science and Technology, The Univ. of Macau, Macau Surface Alloying of Silicon into Aluminum Substrate (Session 13: Surface Processing & Film Deposition I) Zhiyue Xu, Keng Leong, Paul Sanders, Technology Development Division, Argonne National Laboratory, Argonne, IL Section D-ll Induction Assisted Laser-Cladding A New and Effective Method for Producing High Wear Resistant Coatings on Steel Components (Session 13: Surface Processing & Film Deposition I) Section D-20 Andreas Wetzig, Fraunhofer USA, Plymouth, MI; Berndt Brenner, Volker Fux, Eckhard Beyer, Fraunhofer IWS, Dresden, Germany Bonding Strength Studies for Laser Cladding Dies (Session 13: Surface Processing & Film Deposition I) Section D-29 Yu Zhang, Dept. of Technology, Bernal International, Inc., Rochester Hills, MI; Xianghua Zeng, Xiangkai Yuan, Dept. of Materials Science and Engineering, China Textile Univ., Shanghai, China Laser Surface Solutionizing of INCONEL 718: Improvement of Resistance to Hydrogen Embrittlement (Session 13: Surface Processing & Film Deposition I) Section D-41 Akio Hirose, Kojiro F. Kobayashi, Dept. of Manufacturing Science, Graduate School of Engineering, Osaka Univ., Osaka, Japan The Peculiarities of Steels Laser Treatment with CrB 2 and Ni 2 B Powders (Session 13: Surface Processing & Film Deposition I) Section D-51 B. Medres, L. Shepeleva, G. Dehm, W.D. Kaplan, M. Bamberger, Material Engineering Dept.; G. Ryk, Mechanical Engineering, Technion- Israel Institute of Technology, Haifa, Israel ICALEO1998 ri

3 Refurbishment of Heat Treatable Aluminum Alloys by Laser Cladding (Session 13: Surface Processing & Film Deposition D Section D-58 Kenneth C. Meinert, Jr., ARL/The Pennsylvania State Univ., State College, PA Patrick Bergan, Naval Undersea Warfare Center- Keyport Division, Keyport, WA The Performance of Laser Surface Processed Aluminum Alloys for Commercial Alloys (Session 14: Surface Processing & Film Deposition II) Section D-66 M.H. McCay, T. L. Tramel, J.A. Hopkins, Center for Laser Applications, Univ. of Tennessee Space Institute, Tullahoma, TN Surface Modification of an Al 2 O 3 /SiO 2 Based Ceramic Treated with CO 2, Nd:YAG, Excimer and High Power Diode Lasers for Altered Wettability Characteristics (Session 14: Surface Processing & Film Deposition II) Section D-76 J. Lawrence, L. Li, Dept. of Mechanical Engineering, Univ. of Manchester Institute of Science and Technology (UMIST), Manchester, UK; J.T. Spencer, Research & Technology, Preston, UK Laser driven deposition technology by assisting centrifugal force (Session 14: Surface Processing & Film Deposition II) Section D-86 Birgit Angstenberger, Friedrich Dausinger, Helmut Hiigel, Institut fur Strahlwerkzeuge (IFSW), Univ. of Stuttgart, Stuttgart, Germany Influence of Pulse Width and Target Density on Pulsed Laser Deposition of Thin YBaCuO Films (Session 14: Surface Processing & Film Deposition II) Section D-96 S. Vikram, P.A. Molian, M. D. Shirk, Mechanical Engineering Dept., Iowa State Univ., Ames, IA; R. E. Koritala, U. Balachandran, Energy Technology Division, Argonne National Laboratory, Argonne, IL A Particle Filtering Method for Pulsed Laser Deposition (Session 14: Surface Processing & Film Deposition II) Section D-106 Toshihiko Ooie, Tetsuo Yano, Masafumi Yoneda, Munehide Katsumura, Shikoku National Industrial Research Institute, Kagawa, Japan Cavitation Erosion Resistant Coating of NiTi Made by Laser Plasma Hybrid Spraying (Session 14: Surface Processing & Film Deposition II) Section D-113 Hitoshi Hiraga, Takashi Inoue, Applied Laser Engineering Research Institute, Nagaoka, Japan; Hirofumi Shimura, Mechanical Engineering Laboratory, Agency of Industrial Science and Technology, Tsukuba, Japan; Akira Matsunawa, Joining and Welding Research Institute, Osaka Univ., Osaka, Japan *" ICALEO 1998

4 Study of Physical Processes Involved in Laser Shock Processing of Materials (Session 14: Surface Processing & Film Deposition II) Section D-121 L. Berthe, R. Fabbro, P. Peyre, E. Bartnicki, A. Sollier, A. Sollier, CLFA- Centre Laser Franco-AUemand, Arcueil, France Placing Laser Marking Technology into Production: The Benefits of a New Design Tool (Session 14: Surface Processing & Film Deposition II) Section D-130 Alan Burgess, Ke Feng, M.A. Hanna Color, Suwanee, GA A Simple Mathematical Model for Heat Flow Evaluation, Used to Design Complex Heat Sources Obtained From Diffractive Optical Elements (Session 14: Surface Processing & Film Deposition II) Section D-140 K. Williams, J.R. Tyrer, Dept. of Mechanical Engineering, Loughborough Univ., Leicestershire, UK Microstructure and Crack Formation Studies of Laser Produced Deposits (Session 14: Surface Processing & Film Deposition II) Section D-150 Ghazanfar Abbas, College of Electrical and Mechanical Engineering, National Univ. of Sciences and Technology, Rawalpindi, Pakistan; William M. Steen, Univ. of Liverpool, Liverpool, UK; D.R.F. West, Imperial College, London, UK Laser surfacing techniques for laminated tooling (Poster Presentation) Section D-160 R. Ball, W. O'Neill, W. M. Steen, Dept. of Engineering, The Univ. of Liverpool, Liverpool, UK Laser-Surface Ornamentation (Poster Presentation)... Section D-170 A.M. Carey, Jewellery Innovation Centre, BIAD, School of Jewellery, Univ. of Central England, Birmingham, UK; W.M. Steen, Dept. of Mechanical Engineering, Univ. of Liverpool, Liverpool, UK; D. Watkins, G.S.M.J. Royal College of Art, Kensington Gore, London, UK Interaction Between the Laser Beam and the Powder Jet in Blown Powder Laser Alloying and Cladding (Poster Presentation) Section D-180 Omar de Oliveira Diniz Neto, Departamento de Ciencias Ffsicas, Universidade Federal de Uberlandia, Uberlandia, Minas Gerais, Brasil; Rui Mario Correia da Silva Vilar, Departamento de Engenharia de Materiais, Instituto Superior T6cnico Lisboa, Portugal ICALEO 1998 XU1

5 Laser surface alloying of Al and AlSilOMg with Ti and Ni (Poster Presentation) Section D-189 N. Pirch, G. Backes, E.W. Kreutz, Lehrstuhl fur Lasertechnik, RWTH Aachen, Univ. of Technology Aachen, Aachen, Germany; X. He, A. Weisheit, B.L. Mordike, Institut Fiir Werkstoffkunde und Werkstofftechnik, Clausthal-Zellerfeld, Germany Laser Surface Clad Coatings Modified by Rare Earth (Poster Presentation) Section D-197 K.L. Wang, Q.B. Zhang, M.L. Sun, X.G. Wei, Dept. of Mechanical Engineering, Tsinghua Univ., Beijing, PR. China; Y.M. Zhu, Faculty of Science and Technology, Univ. of Macau, Macau In-Situ Laser Crystallization of EB-Deposited ITO Films (Poster Presentation) Section D-206 Tetsuo Yano, Toshihiko Ooie, Masafumi Yoneda, Munehide Katsumura, Shikoku National Industrial Research Institute, Kagawa, Japan; Yoshifumi Suzaki, Tomokazu Shikama, Takamatsu National College of Technology, Kagawa, Japan Laser Plasma Treatment of Materials at Nearly Atmospheric Pressures (Poster Presentation) Section D-216 B. Medres, L. Shepeleva, W.D. Kaplan, M. Bamberger, Dept. of Materials Engineering, Technion-Israel Institute of Technology, Haifa, Israel Section E - Rapid Prototyping and Microfabrication Laser Engineered Net Shaping (LENS ): A Tool for Direct Fabrication of Metal Parts (Session 8: Rapid Prototyping) Clinton Atwood, Michelle Griffith, Lane Harwell, Eric Schlienger, Mark Ensz, John Smugeresky, Tony Romero, Don Greene, Daryl Reckaway, Sandia National Laboratories, Albuquerque, NM Section E-l Rapid Tooling by Laser Cladding (Session 8: RapidPrototyping) Section E-8 Z.D. Chen, T.A. Mai, G.C. Lim, Process Technology Division, Gintic Institute of Manufacturing Technology, Singapore Free-Form Laser Consolidation for Producing Functional Metallic Components (Session 8: Rapid Prototyping). Section E-15 Lijue Xue, Moe Islam, Integrated Manufacturing Technologies Institute, National Research Council Canada, Ontario, Canada Rapid Prototyping of Cermet Tools and Electrodes (Session 8: Rapid Prototyping) Section E-25 Brent Stucker, Peter Hardro, Muni Malhotra, Department of Industrial and Manufacturing Engineering, University of Rhode Island, Kingston, RI xiv ICALEO 1998

6 Direct Generation of Metal Parts and Tools by Selective Laser Powder Remelting (SLPR) (Session 8: Rapid Prototyping) Section E-31 W. Meiners, K. Wissenbach, R. Poprawe, Fraunhofer Institute for Lasertechnology (ILT), Aachen, Germany Selective Laser Sintering of Compacted Cu/Sn Powders (Session 8: Rapid Prototyping) Section E-38 L. Li, A. Slocombe, K.L. Ng, Manufacturing Division, Dept. of Mechanical Engineering, Univ. of Manchester Institute of Science and Technology (UMIST), Manchester, UK Laser-Shape Reconditioning and Manufacturing of Tools and Machine Parts (Session 8: Rapid Prototyping) Section E-48 G. Backes, E.W. Kreutz, E. Hoffmann, R. Poprawe, Lehrstuhl fur Lasertechnik, Aachen, Germany; A. Gasser, S. Keutgen, K. Wissenbach, Fraunhofer-Institut fiir Lasertechnik, Aachen, Germany Precision Machining of Thin Metal Foils Using a Diode Pumped Solid State (DPSS) Laser (Session 9: Microfabrication) Section E-57 S.K. Nikumb, M.U. Islam, H. Reshef, Integrated Manufacturing Technologies Institute, National Research Council, Ontario, Canada Three Dimensional Microstructures in Ceramics by Diode Pumped Solid State Lasers (Session 9: Microfabrication) Section E-64 R. Weichenhain, A. Horn, E.W. Kreutz, Lehrstuhl fiir Lasertechnik, Aachen, Germany; J. Jandeleit, Fraunhofer-Institut fiir Lasertechnik, Aachen, Germany Advanced Strategies for Three-dimensional Micro-structuring with Excimer Lasers (Session 9: Microfabrication) Section E-72 H.K. Tbnshoff, F. von Alvensleben, A. Ostendorf, C. Kulik, Laser Zentrum Hannover e.v., Hannover, Germany Direct-write microcutting and micropatterning of polymers using high prf UV copper lasers (Session 9: Microfabrication) Section E-81 Elizabeth K. Illy, Daniel J.W. Brown, Michael J. Withford, James A. Piper, Centre for Lasers and Applications, Macquarie Univ., Sydney, Australia Laser Beam Micro-Forming - A New Technology (Session 9: Microfabrication) Section E-89 Alexander Olowinsky, Arnold Gillner, Reinhart Poprawe, Fraunhofer-Institut fiir Lasertechnik, Aachen, Germany ICAI.F.O 19Q8 xv

7 Fine Tuning of the Quartz Crystal Wafer by Chemical Abrasion with ArF Excimer Laser (Session 9: Microfabrication) Section E-98 Masayuki Ikeda, Takayuki Shibata, Process Dynamics Laboratory, Graduate School of Engineering, Hokkaido Univ., Sapporo, Japan; Akio Chiba, Nihon Denpa Kogyo Co., Ltd., Sapporo, Japan; Takashi Niwa, Seiko Instrument Co., Ltd., Sapporo, Japan Fiber Laser - Compact Source for Micro-Welding (Session 9: Microfabrication) Section E-106 H.K. Tonshoff, A. Ostendorf, K. Schafer, Laser Zentrum Hannover e.v., Hannover, Germany Sub-micron and High Precision Micro-machining Using Nanosecond Lasers (Session 9: Microfabrication) Section E-112 M.R.H. Knowles, G. Rutterford, A.I. Bell, A.J. Andrews, G. Foster-Turner, A.J. Kearsley, Oxford Lasers Ltd., Abingdon, U.K.; D. W. Coutts, D. Kapitan, C.E. Webb, Clarendon Laboratory, Univ. of Oxford, Oxford, U.K. Laser Forming of Titanium and Other Metals is Useable within Metallurgical Constraints (Session 3: Laser Forming) Section E-121 Warren Maher, Kwok-On Tong, Cliff Bampton, Mark Bright, John Wooten, The Boeing Company, Seattle, WA; Cecil Rhodes, Rockwell Science Center, Thousand Oaks, CA A Numerical Study on Laser Forming of Titanium Plates (Session 3: Laser Forming) Section E-131 Kwok-On Tong, Boeing Information, Space & Defense Systems, Seattle, WA Development of an Integrated Laser Forming Demonstrator System for the Aerospace Industry (Session 3: Laser Forming) Section E-141 Jonathan Magee, Kenneth Watkins, William Steen, Dept of Mech. Eng., Univ. of Liverpool, Liverpool, UK Laser Forming Tubes: A Discussion of Principles (Session 3: Laser Forming) Section E-151 Sarah Silve, B. Podschies, Buckinghamshire Chilterns Univ. College High Wycombe, Buckinghamshire, UK; William Steen, Univ. of Liverpool, Liverpool, UK Bending of Fine Metal Wire and Foil with YAG Laser Beam (Session 3: Laser Forming) Section E-161 Shunro Yoshioka, T. Miyazaki, M. Imai, Y. Shirai, T. Misu, Chiba Institute of Technology, Chiba, Japan XV1 1CALEO 1998

8 Fabrication of Graded-Boundary Ni/Steel Material by Laser Beam and Part 2 Electron Beam (Poster Presentation) Section E-170 To Hoon Kim, Jae Mo Ahn, Byoung Chool Kim, Dept. of Materials Science and Engineering, Yonsei Univ., Seoul, Korea Microstructure of Laser Bent Aluminium Alloy Alclad 2024-T3 (Poster Presentation) Section E-178 J.A. Ramos, J. Magee, K. Watkins, W.M. Steen, Laser Laboratory, Mechanical Engineering, University of Liverpool, Liverpool, UK; F. Noble, Materials Science and Engineering, University of Liverpool, Liverpool, UK Section F -Welding and Modeling Suppression of Cracks by Means of Added Ultrasonic Vibration and/or Controlled Pulse-Tram in Laser Spot Welding of Aluminum Alloys (Session 6: Welding-Experimental I) Takehiro Watanabe, Shin-Ya Ichijyo, Dept. of Mechanical Engineering, Chiba Univ., Chiba, Japan; Jong Shin Kim, Samsung Aerospace Industries, Ltd., Kyungnam, Korea Section F-l Performance of tilted laser beam welding of dissimilar steel sheets (Session 6: Welding-Experimental I) Hongping Gu, W.W. Duley, Department of Physics, Univ. of Waterloo, Ontario, Canada Section F-ll Welding Of Die-Casted Magnesium Alloys On Production Machines (Session 6: Welding-Experimental I) Section F-18 Christof Lehner, Gunther Reinhart, L. Schaller, IWB, Garching, Germany Laser Beam Welding of AZ31B-H24 Magnesium Alloy (Session 6: Welding-Experimental I) Section F-28 K.H. Leong, G. Kornecki, P.G. Sanders, J.S. Keske, Technology Development Division, Argonne National Laboratory, Argonne, IL The Mechanism of High Speed Leading Path Laser-Arc Combination Welding (Session 6: Welding-Experimental I) Section F-37 Nobuyuki Abe, Yasushi Kunugita, Shoji Miyake, Joining and Welding Research Institute, Osaka Univ., Osaka, Japan; Masakazu Hayashi, Yoshiaki Tsuchitani, Takao Mihara, Kubota Corporation, Hyogo, Japan Multi-factorial analysis of Nd: YAG laser welding of high carbon steels: Effect of laser parameters and weld geometry (Session 6: Welding-Experimental I) Section F-46 Eng. S. Ng, Ian A. Watson, Allen Yeo, Laser and Optical System Engineering Center, Dept. of Mechanical Engineering, Univ. of Glasgow, Glasgow, UK ICALEO 1998 xvn

9 Laser Welding of Aluminum Car Bodies -From Research to Production (Session 10: Welding-Experimental H) Section F-56 C. Schinzel, B. Hohenberger, F. Dausinger, H. Hiigel, Institut fur Strahlwerkzeuge (IFSW), Univ. of Stuttgart, Stuttgart, Germany Laser Production and Fatigue Strength of Ail-Steel Sandwich Panels (Session 10: Welding-Experimental H) Section F-66 Pentti Kujala, Helsinki Univ. of Technology/Ship Laboratory, Helsinki, Finland; Antti Salminen, Laserplus Oy, Riihimaki, Finland Neural Network Modeling of Weld Pool Shape in Pulsed-Laser Aluminum Welds (Session 10: Welding-Experimental H) Section F-76 J.M. Vitek, Y.S. Iskander, E.M. Oblow, Oak Ridge National Laboratory, Oak Ridge, TN Investigations into the Welding of Superalloys with a CW. Nd:YAG Laser and Dual-Focusing Optics (Session 10: Welding-Experimental H) Section F-87 I. Sarady, K. Nilsson, C. Magnusson, Lulea Univ. of Technology, Lulea, Sweden; T. Wahlberg, Volvo Aero Corporation, Trollhattan, Sweden Laser Welding of Ultra Low Carbon Steels (Session 10: Welding-Experimental II) Section F-94 Muneharu Kutsuna, Kazuo Uetani, Dept. of Materials Processing Eng., Nagoya Univ., Nagoya, Japan The Effect of an Air Gap on the Properties of High Power Nd:YAG Laser Welds (Session 10: Welding-Experimental H) Section F-103 Tommi Jokinen, VTT Manufacturing Technology, Lappeenranta, Finland; Jari Hovikorpi, Antti Salminen, Laserplus Oy, Riihimaki, Finland; Veli Kujanpaa, Lappeenranta Univ. of Technology, Lappeenranta, Finland Nd:YAG Laser Spot Welding of Very Thin Stainless Steel and Micro X-Ray Characterization of Welds (Session 10: Welding-Experimental IT) Section F-113 Bonifes John, P.A. Molian, R. Sarma, Joseph N. Gray, Mechanical Engineering Department, Iowa State Univ., Ames, IA A Mathematical Model of Laser Keyhole Welding Using a Pressure and Energy Balance at the Keyhole Walls (Session 17: Welding-Experimental HI).. Section F-123 D.A.V. Clucas, W. Steen, Laser Laboratory, Univ. of Liverpool, Liverpool; R. Ducharme, P. Kapadia, Physics Dept, Essex Univ., Colchester, UK; J. Dowden, Mathematics Dept, Essex Univ., Colchester, UK xviii 1CALEO 1998

10 TCAT.F.O1QQ8 Part 2 Exact and Approximate Solutions for Two-Dimensional Temperature Distribution Induced by a Moving Gaussian Heat Source (Session 17: Welding-Experimental III) Section F-132 J. Xie, Edison Welding Institute, Columbus, OH; A. Kar, Center for Research and Education in Electro-Optics and Lasers (CREOL), Univ. of Central Florida, Orlando, FL Surface Depression and Ablation for a Weld Pool in Material Processing: A Mathematical Model (Session 17: Welding-Experimental III) Section F-142 Pablo Solana, Phiroze Kapadia, Dept. of Physics, Univ. of Essex, Colchester, UK; John Dowden, Dept. of Mathematics, Univ. of Essex, Colchester, UK Numerical Prediction and Measurement of the Weld Depth Dependence on the Beam Focal Position During Laser Welding (Session 17: Welding-Experimental III) Section F-150 V.V. Semak, Physics Dept., New Mexico State Univ., Las Cruces, NM; R.J. Steele, Naval Air Warfare Center, China Lake, CA; B.K. Damkroger, P.W. Fuerschbach, Sandia National Laboratories, Albuquerque, NM Process Prototyping for Laser Material Processing-Advanced Finite Element Models for the Simulation of Laser Welding (Session 17: Welding-Experimental III) Section F-158 Frank Rick, Gunther Reinhart, Bernhard Lenz, Institute for Machine Tools and Industrial Management (IWB), Technische Universitael Miinchen, Garching, Germany Little Porosities Trapping During Laser Spot Welding of Tantalum (Session 17: Welding- Experimental III) Section F-168 K. Girard, J.M. Jouvard, IUT Le Creusot, Le Creusot, France P. Naudy, CEA Valduc, Is-sur-Tille, France Dynamical Interpretation of Deep Penetration of CW Laser Welding (Session 17: Welding- Experimental III) Section F-179 Remy Fabbro, Karim Chouf, Lilian Sabatier, Frederic Coste, CLFA, Arcueil, France Melt Flow in Deep Penetration Welding (Session 17: Welding- Experimental III) Section F-187 Michael M. Chen, Jeannine A. Bos, Dept. of Mechanical Engineering & Applied Mechanics, Univ. of Michigan, Ann Arbor, MI Simulation of Laser Evaporation and Plume (Session 17: Welding- Experimental IH) Section F-197 D.F. Farson, K.R. Kim, Industrial, Welding and Systems Engineering Dept., Ohio State Univ., Columbus, OH

11 Mathematical Modeling of the Laser Spot Welding of Zinc Coated Steel in Lap Configuration (Poster Presentation) Section F-207 Rehan Akhter, M.M.S. Gualini, Pakistan Institute of Lasers and Optics, Islamabad, Pakistan A Rapid Seam Tracking device for YAG and CO 2 high speed Laser Welding (Poster Presentation) Section F-217 Frederic Coste, Pascal Aubry, Remy Fabbro, T. Dubois, CLFA, Cedex, France The Gap Bridging Capability in Laser Tailored Blank Welding (Poster Presentation) -...Section F-225 C.R. Hsu, A. Engler, S. Heinemann, Laser Technology, Fraunhofer Resource Center, Michigan, Ann Arbor, MI A CO 2 Laser Weld Shape-Predicting Neural Network (Poster Presentation) Section F-233 G.A. Knorovsky, P.W. Fuerschbach, Materials Joining Dept., Sandia National Laboratories, Albuquerque, NM Laser Beam Welding of Any Metal (Poster Presentation) Section F-243 K.H. Leong, H.K. Geyer, Technology Development Division, Argonne National Laboratory, Argonne, IL The Study of Gum-Like Metal Hydride-Nickel (MH-Ni) Battery Hermetic Seal Weld on Pulsed Laser (Poster Presentation) Section F-252 Meng Qin, Ma Xiaoxian, Zhang Shan, Zhang Guihua, Shen Peng, Tianjing Institute of Laser Technology, Tianjin, P.R. China Welding Characteristics with Multiple Nd: YAG Laser Beams Combined at Surface of Workpiece (Poster Presentation) Section F-258 Toru Narikiyo, Shigeki Fujinaga, Hiroo Takenaka, Research and Development Dept., The Advanced Materials Processing Institute Kinki Japan, Hyogo, Japan; Akira Ohmori, Katsunori Inoue, Joining and Welding Research Institute, Osaka Univ., Osaka, Japan Study on prevention of welding defects for thick plates with high power CO 2 Laser (Poster Presentaion) Section F-268 Naoaki Fukuda, Toshifumi Matsumoto, Yasuo Kondo, Yoshiaki Arata, Research and Development Dept., The Advanced Materials Processing Institute Kinki Japan, Hyogo, Japan; Akira Ohmori, Katsunori Inoue, Joining and Welding Research Institute (JWRI), Osaka Univ., Osaka, Japan

12 Section G - Solid-State & Diode Laser Applications, Electronics Processing, and William Steen lyibute A new Diode pumped CW-multi-kW-Solid State Laser Source - System Performance and first Applications in Materials Processing (Session 1: High Power Solid State Laser Applications) H.D. Hoffmann, G. Schmidt, G. Bonati, H.G. Treusch, P. Loosen, R. Poprawe, Fraunhofer Institut fiir Lasertechnik, Aachen, Germany Section G-l Material Processing with a High Average Power and High Beam Quality Continuous Wave Nd: YAG Laser (Session 1: High Power Solid State Laser Applications) Section G-8 Mohammed Naeem, Lumonics Limited, Rugby, United Kingdom; Steve Riches, Derek Russell, The Welding Institute, Cambridge, United Kingdom Perspectives of Welding with a 6 KW-ND:YAG-Laser for the Automotive Industry (Session 1: High Power Solid State Laser Applications) Section G-18 Holger Alder, W. Bloehs, INPRO GmbH, Berlin, Germany A High Power Q-Switched CO 2 Laser and Its Application to Organic Materials Processing (Session 2: Electronics Processing).Section G-25 T. Sakai, H. Imai, K. Minamida, Process Technology Research Laboratories, Nippon Steel Corporation, Kanagawa, Japan Thermohydrodynamic Analysis for Bump Formation in Laser Texturing (Session 2: Electronics Processing).Section G-33 R. Murayama, E. Ohmura, I. Miyamoto, Dept. of Manufacturing Science, Osaka Univ., Osaka, Japan; H. Hara, N. Inoue, Kubota Corp., Hyogo, Japan Laser Beam Joining for the Micro Technology (Session 2: Electronics Processing) Section G-43 Frauke Legewie, Luedger Bosse, Arnold Gillner, Reinhart Poprawe, Fraunhofer-Institut fiir Laser-technology, Aachen, Germany Development of CO 2 laser drilling system controlled by concurrent in-line inspection monitoring for printed wiring boards (Session 2: Electronics Processing) Section G-50 Hidehiko Karasaki, Kazuhide Isaji, Hisashi Kinoshita, Matsushita Industrial Equipment Co., Ltd., Osaka, Japan; Makoto Kato, Matsushita Research Institute Tokyo, Inc., Tokyo, Japan Laser Synthesized Silicon Carbide Power Semiconductor Devices (Session 2: Electronics Processing) ~ Section G-58 Nathaniel R. Quick, AppliCote Associates, Lake Mary, FL TCAT.FO 1008 xxl

13 Laser Cladding Using High-Power Diode Lasers (Session 11: Diode Laser Processing) Section G-68 Steffen Nowotny, Anne Richter, Eckhard Beyer, Fraunhofer-Institut fiir Werkstoff-und Strahltechnik, Dresden, Germany Surface Hardening with High Power Diode Lasers (Session 11: Diode Laser Processing). Section G-75 Bodo Ehlers, Hans J. Herfurth, Stefan Heinemann, Fraunhofer Resource Center Michigan, Ann Arbor, MI Low Cost Lasersystem for Material Processing (Session 11: Diode Laser Processing) Section G-85 Peter Kugler, Peter Hoffmann, Manfred Geiger, Bayerisches Laserzentrum, Erlangen, Germany Processing Characteristics of a High Energy Density Diode Laser System (Session 11: Diode Laser Processing) Section G-95 Nobuyuki Abe, Yasushi Kunugita, Shoji Miyake, Joining and Welding Research Institute, Osaka University, Osaka, Japan Diode Laser Scribing of Amorphous Alloys for Core Loss Reduction in Distribution Transformers (Session 11: Diode Laser Processing) Section G-103 Satish V. Ponnaluri, P.A. Molian, Mechanical Engineering Dept., Iowa State Univ., Ames, IA New Possibilities for Joining by Using High Power Diode Lasers (Session 11: Diode Laser Processing)...,... Emil Schubert, Ingo Zerner, Gerd Sepold, BIAS- Bremen Institute of Applied Beam Technology, Bremen, Germany Section G-lll Diode Laser Applications Hardening and Welding (Session 11: Diode Laser Processing) Section G-121 S. Bonss, B. Brenner, E. Beyer, Fraunhofer Institute IWS, Dresden, Germany; F. Bachmann, Rofin-Sinar Laser GmbH, Hamburg, Germany Welding of Plastics with Diode Laser (Session 11: Diode Laser Processing) Section G-131 Dirk Hansch, D. Haaf, Heidrun Piitz, Hans Georg Treusch, A. Gillner Reinhart Poprawe, Fraunhofer-Institut for Lasertechnology, Aachen, Germany Modelling of laser treatment process- a versatile development tool (Session: William M. Steen Tribute).. Section G-141 Helmut Hiigel, Peter Berger, Friedrich Dausinger, IFSW, Univ. of Stuttgart, Stuttgart, Germany

14 Liquid Motion in Keyhole Laser Welding (Session: William M. Steen Tribute) Section G-151 Akira Matsunawa, Masami Mizutani, Seiji Katayama, Naoki Seto, Joining and Welding Research Institute, Osaka Univ., Osaka, Japan Point and Line Sources: Models of Power Absorption in the Theory of Welding (Session: William M. Steen Tribute) Section G-161 John Dowden, Dept. of Mathematics, Univ. of Essex, Essex, UK Phiroze Kapadia, Dept. of Physics, Univ. of Essex, Essex, UK On The Mechanism of Airborne Ultrasonic Wave Emission in Laser Welding (Session: William M. Steen Tribute) Section G-171 Lin Li, Manufacturing Division, Dept. of Mechanical Engineering, Univ. of Manchester Institute of Science and Technology (UMIST), Manchester, U.K. Laser Cladding and Surface Treatments (Session: William M. Steen Tribute) Section G-181 Kenneth G. Watkins, Univ. of Liverpool, Liverpool, UK General Aspects of Laser Materials Processing (Session: William M. Steen Tribute) Section G-190 Walter W. Duley, Physics Department, Univ. of Waterloo, Ontario, Canada ICALEO1998 XXU1