• ICALEO 2007 Paper #706 (Relevant Experiments)

    Relevant Experiments
    Authors:
    Edward Metzbower, Eamweld Llc; Washington DC USA
    Presented at ICALEO 2007

    Akira Matsunawa and his co-workers at the Joining and Welding Research Institute at Osaka University devised, created and exploited a series of clever, telling and relevant experiments that has provided us with information on the temperature and the formation of the keyhole in laser beam welding as well as important knowledge as to the flow of the molten pool and the formation of porosity in welds with partial penetration. They have developed a high-speed X-ray transmission observation system to reveal the keyhole, bubble and porosity formation behavior. They utilize two synchronized ultra ...

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  • ICALEO 2007 Paper #802 (Analysis of the Various Melt Pool Hydrodynamic Regimes Observed during CW Nd-YAG Deep Penetration Laser Welding)

    Analysis of the Various Melt Pool Hydrodynamic Regimes Observed during CW Nd-YAG Deep Penetration Laser Welding
    Authors:
    Remy Fabbro, LALP (CNRS)/GIP GERAILP; Arcueil Cedex France
    Sonia Slimani, Air Liquide; St OUEN L'AUMONE France
    Frederic Coste, LALP(CNRS)/GERAILP; Arcueil France
    Francis Briand, Air Liquide; St OUEN L'Aumone France
    Presented at ICALEO 2007

    We present a complete experimental study of the analysis of the hydrodynamics evolution of the melt pool during laser Yag welding of stainless steel. The main diagnostic that has been used in this study is a high-speed video camera (10 to 30 kHz) that allowed us to analyze the main different parts that...

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  • ICALEO 2007 Paper #803 (CW Nd:YAG Laser Welding of Dissimilar Sheet Metals)

    CW Nd:YAG Laser Welding of Dissimilar Sheet Metals
    Authors:
    C van Rooyen, CSIR South Africa; Pretoria Republic of South Africa
    Maritha Theron, CSIR South Africa; Pretoria Republic of South Africa
    LH Ivanchev, CSIR South Africa; Pretoria Republic of South Africa
    Presented at ICALEO 2007

    A 4kW CW Nd:YAG laser was used for lap welding of three different dissimilar metal combinations, namely 316L S/S - Ti64, 316L S/S - Al 5052 and Al 1200 Cu (99.85%). A welding matrix of power, travel speed and spot sizes was investigated. The welded samples were studied and evaluated by means of X-rays, stereo and optical microscopy, SEM analyses, micro-hardness testing as well as sub...

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  • ICALEO 2007 Paper #804 (Evaluation of Weld Porosity in Laser Beam Seam Welds: Optimizing Continuous Wave and Square Wave Modulated Processes)

    Evaluation of Weld Porosity in Laser Beam Seam Welds: Optimizing Continuous Wave and Square Wave Modulated Processes
    Authors:
    Jerome Norris, Sandia National Laboratories; Albuquerque NM USA
    Matthew Perricone, Sandia National Laboratories; Albuquerque NM USA
    R. Allen Roach, Sandia National Laboratories; Albuquerque NM USA
    Kevin Faraone, Honeywell FM&T; Kansas City MO USA
    Chad Ellison, Honeywell FM&T; Kansas City MO USA
    Presented at ICALEO 2007

    Nd:YAG laser joining is a high energy density (HED) process that can produce high-speed, low-heat input welds with a high depth-to-width aspect ratio. This is optimized by formation of a keyhole i...

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  • ICALEO 2007 Paper #805 (Local Strength and Rigidity Increase of Sheet Metal using Bead-On-Plate Laser Welds)

    Local Strength and Rigidity Increase of Sheet Metal using Bead-On-Plate Laser Welds
    Authors:
    Mitja Schimek, Laser Zentrum Hannover E.V.; Hannover Germany
    Andreas Ostendorf, Laser Zentrum Hannover E.V.; Hannover Germany
    Oliver Meier, Laser Zentrum Hannover E.V.; Hannover Germany
    Heinz Haferkamp, Laser Zentrum Hannover E.V.; Hannover Germany
    Presented at ICALEO 2007

    Local physical and geometrical effects which have only been observed so far as side effects in laser welding processes are to be used purposefully, in order to achieve locally adapted mechanical properties and to improve load-transferring components significantly. One aim of this project is the i...

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  • ICALEO 2007 Paper #806 (The Effect of Laser and Welding Parameters on Keyhole and Melt Pool Behavior during Fiber Laser Welding)

    The Effect of Laser and Welding Parameters on Keyhole and Melt Pool Behavior during Fiber Laser Welding
    Authors:
    Antti Salminen, Lappeenranta University of Technology; Lappeenranta Finland
    Anna Fellman, Lappeenranta University of Technology; Lappeenranta Finland
    Presented at ICALEO 2007

    The keyhole laser welding is the most important laser welding process for metal industry. This process utilizes the high energy density of laser beam to vaporize and melt material thus producing a keyhole to material via which the energy is brought to the material. There are various mathematical models created to explain the shape and behavior of keyhole and melt pool during welding. However, the va...

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  • ICALEO 2007 Paper #901 (Fabrication of Fe-based Bulk Metallic Glass Components using Laser Additive Manufacturing)

    Fabrication of Fe-based Bulk Metallic Glass Components using Laser Additive Manufacturing
    Authors:
    Ryan W. Mcvey, Arl, Penn State; State College PA USA
    Shawn Kelly, ARL, The Penn State University; State College PA USA
    Presented at ICALEO 2007

    One of the current limitations in producing bulk metallic glass components of sufficient scale for structural application is the low critical casting thickness available with current amorphous alloy systems. With laser additive manufacturing, material and heat are added incrementally, theoretically leading to the fabrication of much larger amorphous structures than currently achievable with casting alone. Recent experimental results indicate m...

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  • ICALEO 2007 Paper #902 (Development and Improvement in Laser Direct Joining of Metal and Plastic)

    Development and Improvement in Laser Direct Joining of Metal and Plastic
    Authors:
    Yusuke Niwa, osaka university; Ibaraki Japan
    Shuji Kubota, TOYOBO; Ootsu Japan
    Yousuke Kawahito, osaka university; Ibaraki Japan
    Seiji Katayama, osaka university; Ibaraki Japan
    Presented at ICALEO 2007

    Metals and plastics have been used in several industrial applications such as automobiles, electronic devices and aircrafts. Their dissimilar material joining is important in the fundamental fields of manufacturing. Therefore, we have developed a new Laser-Assisted Metal and Plastic (LAMP) joining method with YAG or diode laser, which has many advantages over the conventional...

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  • ICALEO 2007 Paper #903 (Laser Modification of the End of Thin Metal Tube)

    Laser Modification of the End of Thin Metal Tube
    Authors:
    Hajime Miyazawa, Nippon Institute of Technology; Saitama Japan
    Katsuyoshi Hotta, Nippon Institute of Technology; Saitama Japan
    Shojiro Miyake, Nippon Institute of Technology; Saitama Japan
    Presented at ICALEO 2007

    The end of the tubes used for catheter, nozzle and/or filter must be smoothly rounded. To produce the tube, it is cut at a length and then the end is polished mechanically. However, the smaller the diameter, the more difficult it becomes to finish it. Then, a basic study on the modification of the end of thin metal tube using laser technique is conducted. Thin stainless and copper tubes of diameters be...

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  • ICALEO 2007 Paper #904 (Laser Peening of MIG Welded Joint of Aluminum Alloys)

    Laser Peening of MIG Welded Joint of Aluminum Alloys
    Authors:
    Muneharu Kutsuna, Nagoya University; Nagoya Japan
    Hiroki Inoue, Nagoya University; Nagoya Japan
    Kazuo Amano, Aichi Institute of Industrial technology; Aichi-ken Japan
    Yuji Sano, Toshiba Corp.; Yokohama Japan
    Presented at ICALEO 2007

    The effect of laser peening on fatigue strength of MIG welded joint of aluminum alloy, A5052 was investigated using a Q-switch YAG laser facility with high peak power.
    The mechanism of improvement of fatigue strength was also investigated by measuring the residual stress of the specimens and the hardness change. The toes of MIG welded joint were laser peened with th...

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