ICALEO 2009 Paper #1503 (Spectroscopic Measurements of Plasma Plume for Welding Monitoring)
Spectroscopic Measurements of Plasma Plume for Welding Monitoring
Authors:
Seung Hwan Lee, University of Michigan; Ann Arbor MI USA
Jyoti Mazumder, -; -
Presented at ICALEO 2009
The principle of optical emission spectroscopy is studied to detect laser welding defects. Several welding experiments with galvanized steel sheets were conducted using the CO2 laser for the quality monitoring, under the several worst cases which can easily occur in manufacturing environments. In order to simulate the welding defects such as underfill and bead separation, spacers with different thickness are fed in both ends of lab joint configurations. The gap effects from no gap to 0.5mm between the lap ...$28.00
ICALEO 2009 Paper #1502 (Acoustic Monitoring of Weld Penetration during Laser Welding of High Strength Steels)
Acoustic Monitoring of Weld Penetration during Laser Welding of High Strength Steels
Authors:
Wei Huang, southern methodist university; dallas TX USA
Radovan Kovacevic, Southern Methodist University; Dallas TX USA
Presented at ICALEO 2009
High-strength steels are being found of great applications in different industries because of their high strength-to-weight ratio. In order to achieve a high quality weld with full weld penetration during the laser welding process of the high strength steel, acoustic monitoring based on a microphone is applied to sense the weld penetration in this study. To overcome the obstacle posed by intensive background noise, a noise reduction method called ...$28.00
ICALEO 2009 Paper #1501 (Fiber Laser Welding of Titanium Alloys and Its Monitoring Through the Optical Combiner)
Fiber Laser Welding of Titanium Alloys and Its Monitoring Through the Optical Combiner
Authors:
Barbara Previtali, Politecnico Di Milano; Milano Italy
Daniele Colombo, Politecnico di Milano; Italy
Presented at ICALEO 2009
A new monitoring configuration for fiber lasers (FLs) welding processes is proposed in which optical emissions from the welding pool are directly observed through the optical combiner of the FL source with spectroscopic equipment and fast photodiodes. This solution, referred as T.O.C. (Through the Optical Combiner) monitoring, can be easily installed on all FL sources in which an optical combiner is present. As a case study, T.O.C. monitoring in 1 kW cw FL weldi...$28.00
ICALEO 2009 Paper #1404 (Thermodynamic Evaluation of Inert-gas Laser Beam Fusion Cutting with CO2, Disk and Fiber Lasers)
Thermodynamic Evaluation of Inert-gas Laser Beam Fusion Cutting with CO2, Disk and Fiber Lasers
Authors:
Achim Mahrle, TU Dresden; Dresden Germany
Eckhard Beyer, Fraunhofer Iws; Dresden Germany
Presented at ICALEO 2009
Inert-gas laser beam fusion cutting is an established thermal cutting technology for stainless and other high-alloyed steels. At the present time, CO2 lasers are particularly applied for corresponding cutting applications but the nowadays available solid-state disk and fiber lasers seems to be an attractive alternative as efficient cutting heat sources due to their advantages in power efficiency, beam guidance and beam quality. It is consequently anticipated that dis...$28.00
ICALEO 2009 Paper #1403 (Numerical Calculation of Laser Beam Path Influenced by High Temperature Gas Above Specimen during Laser Welding)
Numerical Calculation of Laser Beam Path Influenced by High Temperature Gas Above Specimen during Laser Welding
Authors:
Masami Mizutani, Joining and Welding Research Institute, Osaka University; Ibaraki, Osaka Japan
Seiji Katayama, Joining and Welding Research Institute, Osaka University; Ibaraki, Osaka Japan
Presented at ICALEO 2009
It has been generally accepted that the laser beams of about 1 to 1.1 mm in wavelength, such as fiber, disk and YAG lasers have smaller interaction to the media such as plume and plasma between the optics system and the specimen than CO2 laser beam of 10.6 mm. However, we have recently found that weld bead formation is greatly affected by the state o...$28.00
ICALEO 2009 Paper #1402 (Modelling and Validation of a Direct Metal Deposition Nozzle)
Modelling and Validation of a Direct Metal Deposition Nozzle
Authors:
Weijing He, Twi Ltd; Cambridge Great Britain
Lijuan Zhang, Twi Ltd; Cambridge Great Britain
Paul Hilton, Twi Ltd.; Great Abington, Cambridge Great Britain
Presented at ICALEO 2009
Laser direct metal deposition (LDMD) will only achieve its full potential as an additive manufacturing process when a connection between the process parameters used, the microstructure created and the properties of a particular metal deposit can be established. This paper addresses the development of a numerical model, using computational fluid dynamics software, to describe an existing LDMD nozzle, in terms of the interact...$28.00
ICALEO 2009 Paper #1401 (Temperature Field Simulation of Functional Ceramics during CO2 Laser Sintering)
Temperature Field Simulation of Functional Ceramics during CO2 Laser Sintering
Authors:
Xinyu Du, Beijing University of Technology; Beijing Peoples Republic of China
Lingfel Ji, -; -
Yijian Jiang, -; -
Presented at ICALEO 2009
The functional ceramics of Ta2O5, Ba0.5Sr1.5Na0.6K0.4Nb5O15 (BSKNN) and Sr1.86Ca0.14NaNb5O15 (SCNN) have been prepared successfully by CO2 laser sintering. The physical properties of these laser sintered ceramics are improved comparing to the traditional furnace sintered ceramics. In the present work, a finite-element model is developed to explore the process of laser sintering and the mechanism of property improvement by analyzing the temper...$28.00
ICALEO 2009 Paper #1305 (Direct Laser Deposition Within Post Process Machining Characterization)
Direct Laser Deposition Within Post Process Machining Characterization
Authors:
Konrad Bartkowiak, Fraunhofer IWS; Dresden Germany
Pawel Twardowski, Poznan Univ. of Technology; Poznan Poland
Paul Denney, Presenter not author - CCAT; - USA
Presented at ICALEO 2009
Industry applications of Direct Laser Deposition (DLD) technique grows from year to year. However, progress is limited by 1-step applications area, because most of the deposited layer still requires a post machining process (2-step). Machining can be done at the same laser workstation to save machining time. However, the laser optics are very sensitive to dust, moisture and thermal shock, therefore dry machini...$28.00
ICALEO 2009 Paper #1304 (The Significance of Melt Pool Variables in Laser Direct Deposition of Functionally Graded Aerospace Alloys)
The Significance of Melt Pool Variables in Laser Direct Deposition of Functionally Graded Aerospace Alloys
Authors:
Kamran Shah, The University of Manchester; Manchester Great Britain
Ahmad Salman, -; -
Andrew Pinkerton, The University of Manchester; Manchester Great Britain
Lin Li, The University of Manchester; Manchester Great Britain
Presented at ICALEO 2009
Laser Direct Metal Deposition (LDMD) has developed for diverse applications, from high precision manufacturing to repair. Although functional grading of surface coatings is well established, research into larger scale, intermetallic grading as an alternative to welding is ongoing. This paper consid...$28.00
ICALEO 2009 Paper #1303 (The Exploration on Laser Vertical Sintering with Magnetic Field)
The Exploration on Laser Vertical Sintering with Magnetic Field
Authors:
Xiaogang Li, National Center of Laser Technology, Beijing University of Technology; Beijing Peoples Republic of China
Jimin Chen, National Center of Laser Technology, Beijing University of Technology; Beijing Peoples Republic of China
Furong Liu, National Center of Laser Technology, Beijing University of Technology; Beijing Peoples Republic of China
Penfei Lv, National Center of Laser Technology, Beijing University of Technology; Beijing Peoples Republic of China
Presented at ICALEO 2009
Selective Laser Sintering (SLS) is a fast developing technology of Rapid Manufacturing (RM). In so...$28.00
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