ICALEO 2007 Paper #1805 (Modeling and Simulation of the Energy Deposition in Laser Beam Welding with Oscillatory Beam Deflection)
Modeling and Simulation of the Energy Deposition in Laser Beam Welding with Oscillatory Beam Deflection
Authors:
Achim Mahrle, TU Dresden / IOF - LOT; Dresden Germany
Eckhard Beyer, IWS Dresden / TU Dresden; Dresden Germany
Presented at ICALEO 2007
In recent years, some promising results about laser beam welding with forced beam oscillation were published. Characteristic feature of this technology is the purposeful beam manipulation by an oscillatory beam deflection in superposition to the commonly uniform and rectilinear feed rate of a conventional laser beam welding process. Due to the increased number of welding variables, the application of oscillation techniques offers manifol...$28.00
ICALEO 2007 Paper #1804 (Nd:Yag Laser Absorptance of Rough Metal Surfaces)
Nd:Yag Laser Absorptance of Rough Metal Surfaces
Authors:
David Bergstrom, Mid Sweden University; Ostersund Sweden
John Powell, Laser Expertise Ltd.; Nottingham Great Britain
Alexander F. H. Kaplan, Lulea University of Technology; Lulea Sweden
Presented at ICALEO 2007
The Nd:YLF/Nd:YAG laser absorptance of rough metal surfaces has been investigated using 3D ray tracing simulations on computer-generated Gaussian random rough metal surfaces. The impact of multiple scattering, shadowing and Fresnel-equation based angle dependence on the overall absorption is discussed.$28.00
ICALEO 2007 Paper #1803 (Laser Absorption within a Powder Layer and the Numerical Modeling of Heat Transfer during the Laser Cladding Process)
Laser Absorption within a Powder Layer and the Numerical Modeling of Heat Transfer during the Laser Cladding Process
Authors:
Ryan McVey, Engineering Science and Mechanics Department, The Penn State University; State College PA USA
Richard Martukanitz, ARL, The Penn State University; State College PA USA
Shawn Kelly, ARL, The Penn State University; State College PA USA
Presented at ICALEO 2007
In previous experimentation, it has been shown that laser energy incident onto a powder layer is absorbed within the layer; however, when modeling a powder based laser deposition process, it is common practice to assume surface loading only. The current work explores incorporati...$28.00
ICALEO 2007 Paper #1801 (Simulation Based Design of Hybrid Laser Welding Processes)
Simulation Based Design of Hybrid Laser Welding Processes
Authors:
Dave Farson, Ohio State University; Columbus OH USA
MinHyun Cho, OSU; Columbus OH USA
YongChae Lim, OSU; Columbus OH USA
Presented at ICALEO 2007
In this presentation, development of innovative configurations of the hybrid laser + GMA welding process for fatigue-critical welds, high-speed welding and narrow gap welding are described. Fatigue strength, which is often of concern in fabricated steel structures, is strongly related to the final weld shape in the weld toe region. For fatigue critical welding, the hybrid laser beam focus spot was larger than normal (to prevent keyhole formation) and was loca...$28.00
ICALEO 2007 Paper #1708 (A Study of Optimal Laser Parameters by ANOVA Method in Laser Surface Alloyed NiTi with Mo)
A Study of Optimal Laser Parameters by ANOVA Method in Laser Surface Alloyed NiTi with Mo
Authors:
H.C. Man, The Hong Kong Polytechnic University; Kowloon Hong Kong
Ng Ka Wai, The Hong Kong Polytechnic University; Shatin Hong Kong
T.M. Yue, The Hong Kong Polytechnic University; Kowloon Hong Kong
Presented at ICALEO 2007
The present work investigates the influence of process parameters for laser surface alloying with molybdenum on Nickel Titanium, which is extensively used in medical devices industries. A systematic study of process parameters such as laser power, scanning velocity and pre-paste thickness upon the Mo concentration was carried out. Analysis of variance (...$28.00
ICALEO 2007 Paper #1707 (Deposition Efficiencies of Laser Cladding with Various Sources)
Deposition Efficiencies of Laser Cladding with Various Sources
Authors:
J.F. Tressler, ARL, The Penn State University; University Park PA USA
Richard Martukanitz, ARL, The Penn State University; State College PA USA
J.H. McDermott, ARL, The Penn State University; University Park PA USA
Presented at ICALEO 2007
This presentation will encompass the results of evaluations on laser cladding experiments measuring deposition rates and energy efficiency for various laser systems. With The ability to efficiency deposit material, regardless of the process, is of extreme importance for many cladding applications. To quantify the efficiency of laser cladding, CO2, Nd:YAG (flas...$28.00
ICALEO 2007 Paper #1706 (Laser Cladding of Al-Si/Sic Composite Coatings: Microstructure and Abrasive Wear Behavior)
Laser Cladding of Al-Si/Sic Composite Coatings: Microstructure and Abrasive Wear Behavior
Authors:
Ramasamy Anandkumar, Instituto Superior Tecnico; Lisboa Portugal
Amelia Almeida, Instituto Superior Tecnico; Lisbon Portugal
Rui Vilar, Instituto Superior Tecnico; Lisboa Portugal
Vaclav Ocelik, University of Groningen; Groningen Netherlands
Jeff De Hosson, University of Groningen; Groningen Netherlands
Presented at ICALEO 2007
Coatings of a composite material consisting of an Al-Si matrix reinforced with SiC particles were produced by laser cladding on cast UNS 356 alloy substrates. The influence of processing parameters on the microstructure an...$28.00
ICALEO 2007 Paper #1705 (In-situ Synthesis of Titanium Carbide Particles in Iron Matrix using Laser Cladding)
In-situ Synthesis of Titanium Carbide Particles in Iron Matrix using Laser Cladding
Authors:
Christ Prakash Paul, University of Waterloo; Waterloo, ON ON Canada
Amir Khajepour, University of Waterloo; Waterloo ON Canada
Mehrdad Iravani, University of Waterloo; Waterloo ON Canada
Stephen Corbin, University of Waterloo; Waterloo ON Canada
Presented at ICALEO 2007
Conventionally, the majority of reinforced phases are directly added into coating materials to form reinforcement in the matrix. The interface between the particles and matrix is often a potential source of weakness owing to different thermal expansion coefficients between them. When the surface of ...$28.00
ICALEO 2007 Paper #1704 (The Influence of Various Surface Conditions during Laser Transformation Hardening)
The Influence of Various Surface Conditions during Laser Transformation Hardening
Authors:
Tshidiso Seleka, CSIR National Laser Centre; Pretoria Southwest Africa
Sisa Pityana, CSIR; Pretoria Republic of South Africa
Ken Labuschagne, CSIR; Pretoria Republic of South Africa
Tanya Fedotova, Tshwane University of Technology; Pretoria Republic of South Africa
Presented at ICALEO 2007
This study focuses on the influence of different material surface conditions on the absorption characteristics of the laser beam. Flat rolled 5 mm thick locally manufactured Iscor Bennox® wear plate with a similar chemical composition to AISI 1055 was used as base material. This m...$28.00
ICALEO 2007 Paper #1703 (Experimental Investigation of Residual Stresses Generated during Laser Cladding)
Experimental Investigation of Residual Stresses Generated during Laser Cladding
Authors:
B Pathiraj, University of Twente; Enschede Netherlands
Johannes Hofman, Netherlands Institute for Metals Research; Enschede Netherlands
J Meijer, University of Twente; Enschede Netherlands
Presented at ICALEO 2007
Residual stresses are an important parameter in the process optimization of laser cladding. An important parameter in the process optimization is the residual stresses. These stresses are caused by high thermal gradients and therefore differential thermal contractions are present, as well as the different thermo mechanical properties of the joined materials. An experiment...$28.00
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