PICALO 2006 Paper #503 (Laser and Laser-hybrid Welding of Thick Sheet Aluminium and Steel)
Laser and Laser-hybrid Welding of Thick Sheet Aluminium and Steel
Authors:
Claus Thomy, BIAS Bremer Institut fuer angewandte Strahltechnik; Bremen Germany
Florian Wagner, BIAS Bremer Institut Fuer Angewandte Strahltechnik; Bremen Germany
Frank Vollertsen, BIAS Bremer Institut fuer angewandte Strahltechnik; Bremen Germany
Harald Kohn, BIAS Bremer Institut fuer angewandte Strahltechnik; Bremen Germany
Schilf Matthias, BIAS Bremer Institut für angewandte Strahltechnik; Bremen Germany
Thomas Seefeld, BIAS Bremer Institut fuer angewandte Strahltechnik; Bremen Germany
Presented at PICALO 2006
Laser and laser hybrid welding offer the po...$28.00
PICALO 2006 Paper #502 (Economic Edge Preparation for Laser-MAG Hybrid Welding of High Strength Steel)
Economic Edge Preparation for Laser-MAG Hybrid Welding of High Strength Steel
Authors:
Ben Boese, Laser Zentrum Hannover E.V.; Hannover Germany
Gerd Kuscher, Schweitechniche Lehr- und Versuchsanstalt Hannover gGmbH; Hannover Germany
Presented at PICALO 2006
In the crane and freight vehicle manufacturing industry, lightweight construction is a strong issue. A reduction of material thickness in extension arms of cranes or mobile concrete pumps leads to an increase of the number of segments possible and therefore to a longer reach and a higher payload. For these applications, a wide range of high strength fine grain steels for coarse plates has been developed. While these steels hav...$28.00
PICALO 2006 Paper #501 (Hybrid Laser-Arc Processing)
Hybrid Laser-Arc Processing
Authors:
William Steen, Emeritus Professor of the University of Liverpool; Herts Great Britain
Presented at PICALO 2006
The concept of adding cheap power to enhance the high quality power from a laser seems a sensible approach to developing useful industrial processes that require cheap high power. The "cheap" power could be reactive gases, flames, plasmas, arcs or induction. Ever since oxygen assisted cutting was invented in 1967 various attempts at this mixed power processing have been developed or suggested. Due to the need for greater process throughput with looser manufacturing precision there has been a marked revival of interest in hybrid processes of late. T...$28.00
PICALO 2006 Paper #404 (The Role of Analytic Heat Flow Models in Laser Processing)
The Role of Analytic Heat Flow Models in Laser Processing
Authors:
Rowan Deam, Swinburne University; Melbourne, Victoria Australia
Presented at PICALO 2006
The development of laser processing procedures often requires knowing the temperature at selected places and times on the workpiece being treated for a range of processing conditions. The usual approach is to run a computer model of the process in order to speed up the development and optimisation of the process parameters. Setting up finite difference or finite element numerical models can be time consuming and prone to error, for those of us not up to speed in the discipline of numerical modelling. We present the results of an analytical m...$28.00
PICALO 2006 Paper #403 (The Reflectance of Steels and Non-ferrous Alloys to Nd:YAG and Nd:YLF Laser Light)
The Reflectance of Steels and Non-ferrous Alloys to Nd:YAG and Nd:YLF Laser Light
Authors:
David Bergström, Mid Sweden University; stersund Sweden
John Powell, Laser Expertise Ltd.; Nottingham Great Britain
Alexander Kaplan, Lulea University of Technology; Lulea Sweden
Presented at PICALO 2006
The measurement of reflectance is important for the analysis and modelling of laser-material interactions. Unfortunately, most of the reflectance data presently available consider only polished pure metals rather than the commercially available (unpolished, oxidised) alloys which are actually being processed. This paper presents the results of reflectance measurements carried ...$28.00
PICALO 2006 Paper #402 (Convection of Energy in Partially Ionised Vapour in Laser Keyhole Welding)
Convection of Energy in Partially Ionised Vapour in Laser Keyhole Welding
Authors:
John Dowden, University of Essex; Colchester Essex Great Britain
Presented at PICALO 2006
Laser power is absorbed in laser keyhole welding by several mechanisms. In CW CO2 welding absorption into the partially ionised vapour in the keyhole by the processes of inverse bremsstrahlung and thermal conduction can be important. The energy is then transferred to the work piece by thermal conduction through the vapour. This process has recently been partially modelled mathematically. Experimental observations give a wide range of values for the possible vapour temperatures and as a result, widely varying estimates for th...$28.00
PICALO 2006 Paper #401 (Basic Understanding on Beam - Plasma Interaction in Laser Welding)
Basic Understanding on Beam - Plasma Interaction in Laser Welding
Authors:
Akira Matsunawa, Osaka Univ.; Hyogo Japan
Jong-Do Kim, Korean Maritime University; Korea
Presented at PICALO 2006
In early development days of laser welding, most of engineers and scientists believed that the laser induced plasma was the high temperature and pressure plasma which could reflect the incident beam by plasma due to the plasma electron frequency. However, the necessary electron number density to cut-off the incident beam are 1019 1/cm3 for YAG laser (1.06 μm) and 1021 1/cm3 for CO2 laser (10.6 μm). These electron number densities are unable to achieve in the one atmospheric pressure thermal...$28.00
PICALO 2006 Paper #307 (Microstructural Features and Cracking of Laser Cladding on 7XXX Aluminium Alloys with Al-12%Si Powder)
Microstructural Features and Cracking of Laser Cladding on 7XXX Aluminium Alloys with Al-12%Si Powder
Authors:
Qianchu Liu, DSTO; Melbourne Australia
Presented at PICALO 2006
There has been increasing interest to apply laser cladding technology on aluminium alloys for repairing damaged surfaces of aircraft components by fatigue or corrosion. However, the mechanical or corrosion properties strongly depend on the microstructures. This paper presents the study of the microstructural features in both the clad layer and the Heat-affected zones (HAZs). The aluminium-12%silicon (Al-12%Si) powder was used for cladding of 7075 Al alloy. The main features in the clad layer are fine -aluminium dendriti...$28.00
PICALO 2006 Paper #306 (Study of Melting Characteristics of Wire in Laser Cladding Process)
Study of Melting Characteristics of Wire in Laser Cladding Process
Authors:
Nazmul Alam, CSIRO; Adelaide Australia
Presented at PICALO 2006
Laser cladding is becoming an attractive process for the repair and hardfacing of high-value components. The consumables used for these cladding processes are usually in the form of metallic powders due to the ease of operation. However, the use of metal powder is mostly limited to downhand position cladding process. Wire can also be used in laser cladding process and can be fed directly into the laser beam out-of-positions. However, in such cases dilution with the work piece can be difficult to control. This work has investigated aspects of the wire c...$28.00
PICALO 2006 Paper #305 (Residual Stresses in Al7075 Alloy Plate Laser Clad with AL-12SI Alloy Powder)
Residual Stresses in Al7075 Alloy Plate Laser Clad with AL-12SI Alloy Powder
Authors:
Yvonne Durandet, Industrial Research Institute of Swinburne University of Technology (IRIS); Hawthorn Australia
R. Deam, Industrial Research Institute Swinburne; Hawthorn Australia
Maurice Ripley, Australian Nuclear Science and Technology Organisation (ANSTO); Lucas Heights Australia
Philip Bendeich, Australian Nuclear Science and Technology Organisation (ANSTO); Lucas Heights Australia
Milan Brandt, Industrial Research Institute of Swinburne University of Technology (IRIS); Hawthorn Australia
Qianchu Liu, Defence Science and Technology Organisation (DSTO); Fisher...$28.00
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