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ICALEO 2008

216 Products.
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ICALEO 2008 Paper #1002 (Assessment of Different Laser Hybrid Welding Processes)

ICAL08_1002

Assessment of Different Laser Hybrid Welding Processes
Authors:
Antti Salminen, Lappeenranta University of Technology, Finland; Lappeenranta Finland
Paul Kah, Lappeenranta University of Technology, Finland; Lappeerenta Finland
Jukka Martikainen, Lappeenranta University of Technology, Finland; Lappeenranta Finland
Presented at ICALEO 2008

The hybrid welding process, which combines two welding processes together (e.g. laser and an arc), has received much consideration in recent years as a high speed, highly competent, excellent quality welding process which recompenses weaknesses of the individual welding processes. A variety of experiments in laser/MIG/MAG hybrid weldin...

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ICALEO 2008 Paper #1003 (The Arc in Hybrid Welding Serves As a Sensor for the Process Quality)

ICAL08_1003

The Arc in Hybrid Welding Serves As a Sensor for the Process Quality
Authors:
Uwe Reisgen, Rwth Aachen University, Welding and Joining Institute; Aachen Germany
Simon Olschok, Rwth Aachen University, Welding and Joining Institute; Aachen Germany
Stefan Jakobs, Rwth Aachen University, Welding and Joining Institute; Aachen Germany
Presented at ICALEO 2008

Laser GMA hybrid welding which has been invented by Bill Steen in the late Seventies of the last century is gaining in importance in the metal-working industry. For this reason, the process is also in the special focus of interest in the fields of research and development. Irregularities in the arc welding process are w...

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ICALEO 2008 Paper #1004 (Defects and Process Tolerances in Welding of Thick Plates)

ICAL08_1004

Defects and Process Tolerances in Welding of Thick Plates
Authors:
Frank Vollertsen, BIAS; Bremen Germany
Stefan Gruenenwald, Bias; Bremen Germany
Presented at ICALEO 2008

Laser welding and laser-GMA hybrid welding using an 8 kW fiber laser was investigated. Steel plates from low alloyed steel (e. g. pipeline steel X65) having a thickness of 10 mm up to 20.5 mm were joined under various conditions. Single layer laser welding and laser-GMA hybrid welding as well as multi layer hybrid welding were investigated for different seam preparation types. Butt welds and different types of single-V butt welds with broad root face have been tested. The gap and the edge misalignment have been v...

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ICALEO 2008 Paper #1005 (Distribution of Wire Feeding Elements in Laser-arc Hybrid Welding)

ICAL08_1005

Distribution of Wire Feeding Elements in Laser-arc Hybrid Welding
Authors:
Lin Zhao, National Institute for Materials Science; Tsukuba, Ibaraki Japan
Susumu Tsukamoto, National Institute for Materials Science; Tsukuba, Ibaraki Japan
Tomohiro Sugino, National Institute for Materials Science (Present Address:Ihi); Yokohama Japan
Goro Arakane, National Institute for Materials Science; Tsukuba, Ibaraki Japan
Presented at ICALEO 2008

One of the advantages of the laser-arc hybrid welding is to attain the improved microstructure and mechanical property of the weld metal by feeding filler materials. In this case, the alloying elements should be distributed homoge...

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ICALEO 2008 Paper #1006 (Study of Phenomenon of Fibre-Laser-Mig/Mag-Hybrid-Welding)

ICAL08_1006

Study of Phenomenon of Fibre-Laser-Mig/Mag-Hybrid-Welding
Authors:
Heidi Piili, Lappeenranta University of Technology; Lappeenranta Finland
Antti Salminen, Lappeenranta University of Technology; Lappeenranta Finland
Petri Harkko, Cavitar Ltd; Tampere Finland
Janne Lehtinen, Cavitar Ltd; Tampere Finland
Presented at ICALEO 2008

The laser hybrid welding processes are widening the field of laser welding applications. They are gaining ever more interest in many sectors of metal industry. There is quite a few successful applications already in use for example in automotive, ship building and construction industry. The current development steps of high power fi...

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ICALEO 2008 Paper #101 (Morphological and Thermal Modelling of Direct Metal Deposition: Application to Aeronautical Alloys)

ICAL08_101

Morphological and Thermal Modelling of Direct Metal Deposition: Application to Aeronautical Alloys
Authors:
Patrice Peyre, Lalp-Gerailp, Upr 1578 Cnrs; Arcueil France
Pascal Aubry, Gip-Gerailp; Arcueil France
R�My Fabbro, Lalp-Gerailp, Upr 1578 Cnrs; Arcueil France
Presented at ICALEO 2008

Direct metal deposition (DMD) allows to generate complex structures from the interaction between a projected powder and a laser beam, with or without using a coaxial device. One of the main issues to address concerns the prediction of layer widths and heights from the laser and powder parameters, in order to allow thermal or thermo-mechanical modelling in a second step. Indeed, most...

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ICALEO 2008 Paper #102 (Novel Computer Generated Diffractive Optics Modifying Beam Characteristics to Improve the Microstructures of Directly Deposited Inconel 625)

ICAL08_102

Novel Computer Generated Diffractive Optics Modifying Beam Characteristics to Improve the Microstructures of Directly Deposited Inconel 625
Authors:
John Tyrer, Loughborough University; Loughborough Great Britain
Matthew Gibson, Loughborough University; Loughborough Great Britain
Rebecca Higginson, Loughborough University; Loughborough Great Britain
Presented at ICALEO 2008

A major use of metal additive welding is the repair of damaged or worn turbine blades. Current methods used to produce multiple layer repairs in high nickel content alloys have shown an inability to prevent intergranular cracking and levels of porosity in the deposited material. These problems are c...

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ICALEO 2008 Paper #103 (Process Control on Laser Cladding for Direct Manufacturing: Control of the Width and Height of the Deposited Material by Coaxial Vision)

ICAL08_103

Process Control on Laser Cladding for Direct Manufacturing: Control of the Width and Height of the Deposited Material by Coaxial Vision
Authors:
Mehdi Guiraud, Gerailp; Arcueil France
Pascal Aubry, CEA / GERAILP; Arcueil France
Remy Fabbro, Gerailp/Lalp; Arcueil France
Presented at ICALEO 2008

In order to generate 3D complex structures by laser cladding, it is necessary to control the width and the height of the deposited material. First, we present a general overview of the problem. The phenomenological model linking the main the process parameters with the output parameters (width and height of the deposited material) is presented. As this model evidences, the proce...

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ICALEO 2008 Paper #105 (An Investigation on Porosity in Laser Metal Deposition)

ICAL08_105

An Investigation on Porosity in Laser Metal Deposition
Authors:
Gary K.L. Ng, Simtech; Singapore Singapore
Guijun Bi, Simtech; Singapore Singapore
Hongyu Zheng, Singapore Institute of Manufacturing Technology (Simtech); Singapore Singapore
Presented at ICALEO 2008

Laser metal deposition is a process that involves laser processing of fine metal powders into forming three-dimensional structures. Its versatility offers immense opportunities in numerous applications. However, the deposited material using the powder blown process is often plagued by inherent defects such as porosity which cannot be tolerated in certain applications. The origin of the gas porosity observed i...

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ICALEO 2008 Paper #106 (Laser-assisted Production of Electrical Discharge Machining (EDM) Electrodes: A Comparative Study between Rapid Prototyping by Selective Laser Sintering and Laser Surface Cladding Techniques)

ICAL08_106

Laser-assisted Production of Electrical Discharge Machining (EDM) Electrodes: A Comparative Study between Rapid Prototyping by Selective Laser Sintering and Laser Surface Cladding Techniques
Authors:
F. Lusquiños, University of Vigo; Vigo Spain
R. Comesaña, University De Vigo; Vigo Spain
J. del Val, University of Vigo; Vigo Spain
V. Ventosinos, Centro Tecnologico De Automocion De Galicia (Ctag); Porrino Spain
R. Vázquez, Centro Tecnologico De Automocion De Galicia (Ctag); Porri�O Spain
A. Riveiro, University of Vigo; Vigo Spain
F. Quintero, University of Vigo; Vigo Spain
H. Santísima-Trinidad, Centro Tecnologico De A...

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ICALEO 2008 Paper #107 (Mitigation of Porosity in Laser Powder Deposition under Vibratory Condition)

ICAL08_107

Mitigation of Porosity in Laser Powder Deposition under Vibratory Condition
Authors:
Ehsan Foroozmehr, Center for Laser Aided Manufacturing, Southern Methodist University; Dallas TX USA
Radovan Kovacevic, Center for Laser Aided Manufacturing, Southern Methodist University; Dallas TX USA
Syed Hamid, Halliburton Energy Services; Carrollton TX USA
Presented at ICALEO 2008

Near-net shape fabrication processes, such as laser powder deposition (LPD) have been used as a unique technique in manufacturing components with complex geometry. Improving the quality of the final buildup is still of great interest. In this paper, the effect of in-process vibration on the porosity perc...

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ICALEO 2008 Paper #108 (Application and Evaluation Performance of DMS in the SLS Process)

ICAL08_108

Application and Evaluation Performance of DMS in the SLS Process
Authors:
Dong Soo Kim, Korea Institute of Machinery & Materials; Daejeon South Korea
Sung Woo Bae, Korea Institute of Machinery & Materials; Daejeon South Korea
Kyung Hyun Choi, Cheju National University; Jeju-Si South Korea
Seong Yeon Yoo, Chungnam National University; Daejeon South Korea
Presented at ICALEO 2008

Rapid manufacturing and high accuracy are very important factors in the Selective Laser Sintering (SLS) process, one of Solid Freeform Fabrication (SFF) system due to the life cycle of a product getting shorter. In order to develop more elaborate and speedy system for fabricating o...

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ICALEO 2008 Paper #109 (The Use of Holographically Customised Beam Profiles to Control the Overall Physical Cross Section of Direct Metal Depositions)

ICAL08_109

The Use of Holographically Customised Beam Profiles to Control the Overall Physical Cross Section of Direct Metal Depositions
Authors:
John Tyrer, Loughborough University; Loighborough Great Britain
Matthew Gibson, Loughborough University; Loughborough Great Britain
Rebecca Higginson, Loughborough University; Loughborough Great Britain
Presented at ICALEO 2008

This work considers the variation in flux density used during deposition and its role in controlling the overall cross sectional profile of the final track. Circular beams of various intensity profiles typically generate little variation in track cross section. When a moving laser beam interacts with a surface th...

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ICALEO 2008 Paper #110 (6.5Kw High Power Direct Diode Laser Applications in Heavy Industries)

ICAL08_110

6.5Kw High Power Direct Diode Laser Applications in Heavy Industries
Authors:
Yoshihisa Maeda, Hitachi Plant Technologies, Ltd.; Tsuchiura, Ibaraki Japan
Hiromi Kobayashi, Hitachi Plant Technologies, Ltd.; Tsuchiura, Ibaraki Japan
Tetsuya Kuwano, Hitachi Plant Technologies, Ltd.; Tsuchiura, Ibaraki Japan
Takeshi Tsukamoto, Materials Research Laboratory; Hitachi, Ibaraki Japan
Masaaki Iwasas, Mechanical Engineering Research Laboratory; Hitachinaka, Ibaraki Japan
Presented at ICALEO 2008

Recently, small spot lasers, e.g., CO2, YAG, disc and fiber lasers, have been applied to material processing in heavy industries. Meanwhile, Direct-Diode-Laser ...

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ICALEO 2008 Paper #1101 (Excimer Laser Treatment of Aluminium Alloys and Their Potential Applications)

ICAL08_1101

Excimer Laser Treatment of Aluminium Alloys and Their Potential Applications
Authors:
Z. Liu, The University of Manchester; Manchester Great Britain
F. Viejo, The University of Manchester; Manchester Great Britain
Z. Aburas, The University of Manchester; Manchester Great Britain
Y. Yuan, The University of Manchester; Manchester Great Britain
A. Gupta, The University of Manchester; Manchester Great Britain
Presented at ICALEO 2008

Although laser surface melting (LSM) of aluminium alloys using high power continuous wave (cw) CO2 and Nd:YAG lasers has shown to produce homogenization/refinement of microstructure, the refined second phase particles...

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ICALEO 2008 Paper #1102 (Obtaining Thermal Damping Metallic Porous Coating on Ceramics by Means of Supersonic Laser Spray Technique)

ICAL08_1102

Obtaining Thermal Damping Metallic Porous Coating on Ceramics by Means of Supersonic Laser Spray Technique
Authors:
A. Riveiro, University of Vigo; Vigo Spain
F. Lusqui�Os, University of Vigo; Vigo Spain
F. Quintero, University of Vigo; Vigo Spain
R. Comesa�A, University of Vigo; Vigo Spain
J. Pou, Universidade De Vigo; Vigo Spain
Presented at ICALEO 2008

This work presents a novel technique, named supersonic laser spraying, to coat ceramic materials with metals. This technique enables to obtain porous coatings which can act as thermal barriers. In this technique, a laser beam is focused onto the surface of a precursor material in such a wa...

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ICALEO 2008 Paper #1104 (Laser Alloying of Al with Ti and Ni Based Powders to Improve Wear Resistance and Hardness)

ICAL08_1104

Laser Alloying of Al with Ti and Ni Based Powders to Improve Wear Resistance and Hardness
Authors:
Lipson Rampedi, CSIR National Laser Centre; Pretoria Southwest Africa
Luyolo Mabhali, CSIR National Laser Centre; Pretoria Southwest Africa
Sisa Pityana, CSIR National Laser Centre; Pretoria Southwest Africa
Presented at ICALEO 2008

Laser surface alloying of aluminium AA 1200 was performed with a 4.4 kW Rofin Sinar Nd:YAG laser to improve its hardness and wear resistance. Alloying was carried out by depositing Ni and Ti based powders with different weight ratios on the aluminium substrate at different laser scanning speeds. The intermetallics formed were examined using op...

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ICALEO 2008 Paper #1105 (Rapid Transformation of Scale on Steel Sheets by Laser Irradiation)

ICAL08_1105

Rapid Transformation of Scale on Steel Sheets by Laser Irradiation
Authors:
Koji Hirano, Nippon Steel Corporation; Futtsu-City Chiba Japan
Atsushi Sugihashi, Nippon Steel Corporation; Futtsu-City Chiba Japan
Yasumitsu Kondo, Nippon Steel Corporation; Futtsu-City Chiba Japan
Hirofumi Imai, Nippon Steel Corporation; Futtsu-City Chiba Japan
Naoya Hamada, Nippon Steel Corporation; Futtsu-City Chiba Japan
Presented at ICALEO 2008

Scale, iron oxide on hot strip steel sheets, consists of several kinds of oxides; hematite (Fe2O3), magnetite (Fe3O4) and wustite (FeO) as well as iron (Fe) itself. In this study, controlling of scale properties is studied...

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ICALEO 2008 Paper #1201 (Novel Insights into Porosity Formation Mechanisms in Laser Beam Welding of Aluminium)

ICAL08_1201

Novel Insights into Porosity Formation Mechanisms in Laser Beam Welding of Aluminium
Authors:
Andreas Trautmann, Technical University of Munich; Garching Germany
Michael F. Zaeh, Technische Universitaet Muenchen; Garching Germany
Presented at ICALEO 2008

Porosity formation of laser beam welds in aluminum alloys is problematic for the properties of the welded pieces. For more than a decade extensive research had been concentrated to determine the causes for porosity formation and the design of according welding techniques to suppress their arise. In this paper a novel empirical insight into porosity formation in aluminum alloys is presented. The aluminum alloy considered is EN AW-60...

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ICALEO 2008 Paper #1202 (Laser Hybrid Welding of a Lean Duplex Stainless Steel)

ICAL08_1202

Laser Hybrid Welding of a Lean Duplex Stainless Steel
Authors:
Elin Westin, Outokumpu Stainless; Avesta Sweden
Anna Fellman, Weldcon; Lappeenranta Finland
Presented at ICALEO 2008

The use of duplex stainless steel increases steadily worldwide and the fluctuations in nickel price the recent years have contributed to further growth. The lean duplex grade Outokumpu LDX 2101 (EN 1.4162, UNS S32101) has low nickel content and is alloyed with nitrogen and manganese to give a balanced microstructure. It means that good austenite formation is obtained even when laser welding autogenously (without filler). This is in contrast to most other duplex grades, for which laser welding is normally ...

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ICALEO 2008 Paper #1203 (Experimental Test Set-up for Studying Hot Cracking in Multi Pass Laser Hybrid Welding of Thick Section Austenitic Stainless Steel)

ICAL08_1203

Experimental Test Set-up for Studying Hot Cracking in Multi Pass Laser Hybrid Welding of Thick Section Austenitic Stainless Steel
Authors:
Miikka Karhu, VTT- Technical Research Centre of Finland; Lappeenranta Finland
Veli Kujanpaa, VTT- Technical Research Centre of Finland / Lappeenranta University of Technology; Lappeenranta Finland
Presented at ICALEO 2008

Although the austenitic stainless steel grades are commonly considered to be quite an easy weldable, there are certain applications which make exception to above statement. As an example, which has also attributed to this study, it could be mentioned a welded assembly which forms a very rigid structure. In above mentioned struc...

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ICALEO 2008 Paper #1204 (Fiber Laser Hybrid Welding of Stainless Steels)

ICAL08_1204

Fiber Laser Hybrid Welding of Stainless Steels
Authors:
Anna Fellman, Weldcon; Lappeenranta Finland
Elin Westin, Outokumpu Stainless; Avesta Sweden
Presented at ICALEO 2008

Laser welding gives better penetration than conventional welding methods and can significantly increase the welding speed. Use of laser hybrid welding can further enhance the welding speed by improving gap bridgeability and allowing the addition of filler metal to facilitate welding of special grades. Fiber laser gas-metal arc (GMA) hybrid welding was performed on 8 mm austenitic 316L (EN 1.4404/ 1.4432, UNS S316L) and duplex 2205 (EN 1.4462, UNS S31805) stainless steel with the recommended filler wires. Both le...

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ICALEO 2008 Paper #1301 (Custom Beam Shaping for High-Power Fiber Laser Welding)

ICAL08_1301

Custom Beam Shaping for High-Power Fiber Laser Welding
Authors:
Brian Victor, EWI; Columbus OH USA
Craig T. Walters, Craig Walters Associates; Powell OH USA
Stan Ream, Ewi; Columbus OH USA
Presented at ICALEO 2008

With the ever increasing power and performance of fiber lasers, autogenous laser welding is becoming more practical for thick-section welding applications. High-power, high beam quality lasers can produce high aspect ratio welds at productive travel speeds with minimal distortion. However, autogenous laser welding can produce undercutting or other geometric stress concentrations at the weld toes. Through the design of custom optics, the laser beam can be d...

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ICALEO 2008 Paper #1302 (Temporal Behaviour of the Focal Shift of Beam Forming Optics for High Power Single Mode Lasers)

ICAL08_1302

Temporal Behaviour of the Focal Shift of Beam Forming Optics for High Power Single Mode Lasers
Authors:
Axel Hess, Forschungsgesellschaft fuer Strahlwerkzeuge FGSW; Stuttgart Germany
Felix Abt, Forschungsgesellschaft fuer Strahlwerkzeuge FGSW; Stuttgart Germany
Friedrich Dausinger, Forschungsgesellschaft fuer Strahlwerkzeuge FGSW; Stuttgart Germany
Presented at ICALEO 2008

New generations of thin disk and fibre lasers are combining excellent beam quality – typically having M² between 1.2 and approximately 8 – with kilowatts of output power. This combination of power and beam quality brings the imaging performance of beam-forming optics into focus. Former research ...

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ICALEO 2008 Paper #1303 (Development of Computer Generated Hologram for Laser Processing of a High Power Diode Laser)

ICAL08_1303

Development of Computer Generated Hologram for Laser Processing of a High Power Diode Laser
Authors:
Hideki Hagino, Technology Research Institute of Osaka Prefecture; Izumi Japan
Hikaru Ando, Osaka Prefecture University; Sakai Japan
Hisao Kikuta, Osaka Prefecture University; Sakai Japan
Presented at ICALEO 2008

A computer generated hologram (CGH) has been designed and fabricated for laser transformation hardening with a high-power diode laser. A laser intensity distribution to obtain a uniform hardened depth in a steel plate has been determined by the three-dimensional dynamic thermal analysis based on the finite element method. The optimized laser intensity distributi...

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216 Products.
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