ICALEO 2010 Paper #407 (X-Ray Analysis of Pore Formation in Direct Metal Deposition and Its Causes)

X-Ray Analysis of Pore Formation in Direct Metal Deposition and Its Causes
Authors:
M Naveed Ahsan, Manufacturing and Management Group,The University of Manchester; Manchester Great Britain
Andrew J Pinkerton, Manufacturing and Management Group, the University of Manchester; Manchester Great Britain
Robert Bradley, Henry Moseley X-ray Imaging Facility, School of Materials, The University of Manchester; Manchester Great Britain
Presented at ICALEO 2010

Laser direct metal deposition has wide applications in the areas of rapid manufacturing, surface coating and
component repair. Defects of interlayer and intralayer porosity are often observed in laser deposited structure...

ICALEO 2010 Paper #405 (Numerical Modeling of Direct Metal Deposition : Heat Transfer / Solute Transport of Ternary System)

Numerical Modeling of Direct Metal Deposition : Heat Transfer / Solute Transport of Ternary System
Authors:
Hyung Min Chae, Center for Laser-Aided Intelligent Manufacturing, University of Michigan; Ann Arbor MI USA
Jyoti Mazumder, Center for Laser Aided Intelligent Manufacturing University of Michigan; Ann Arbor MI USA
Presented at ICALEO 2010

Laser aided Direct Metal Deposition (DMD) process is used for rapid prototyping, tooling and die production, and repairing damaged parts or worn parts by depositing metal powders. Numerical simulation of DMD process helps provide optimal process parameters for better mechanical / thermal properties of products without performing a series of e...

ICALEO 2010 Paper #404 (An Iterative, Energy-Mass Balance Model for Laser Metal Deposition)

An Iterative, Energy-Mass Balance Model for Laser Metal Deposition
Authors:
M Naveed Ahsan, School of Mechanical, Aerospace and Civil Engineering, The University of Manchester; Manchester Great Britain
Wei Wang, School of Mechanical, Aerospace and Civil Engineering, The University of Manchester; Manchester Great Britain
Andrew J Pinkerton, School of Mechanical, Aerospace and Civil Engineering, The University of Manchester; Manchester Great Britain
Presented at ICALEO 2010

Multiple analytical models of the laser metal deposition process have been presented, but most rely on
sequential solution of the energy and mass balance equations presented. Discretization of the pr...

ICALEO 2010 Paper #403 (Comprehensive Predictive Modeling and Parametric Analysis of Multi-Track Direct Laser Deposition Processes)

Comprehensive Predictive Modeling and Parametric Analysis of Multi-Track Direct Laser Deposition Processes
Authors:
Shoayi Wen, Center for Laser-based Manufacturing, School of Mechanical Engineering, Purdue University; W. Lafayette IN USA
Yung Shin, Center for Laser-based Manufacturing, School of Mechanical Engineering, Purdue University; W. Lafayette IN USA
Presented at ICALEO 2010

Laser direct deposition is a very useful method of fabricating building complex parts directly from CAD drawings. Despite its usefulness, many parameters that affect the final quality of the fabricate part make the selection of optimal operating conditions difficult. The supplying powder jet conditi...

ICALEO 2010 Paper #402 (Wavelength Optimization for Laser Metal Deposition)

Wavelength Optimization for Laser Metal Deposition
Authors:
Antoni Candel-Ruiz, TRUMPF Laser- und Systemtechnik GmbH; Ditzingen Germany
David Havrilla, TRUMPF Inc. und Systemtechnik GmbH; Plymouth MI USA
Jűrgen Metzger, TRUMPF Laser- und Systemtechnik GmbH; Ditzingen Germany
Presented at ICALEO 2010

Study on deposition rate and quality as a function of laser wavelength and laser power.
The study shows application results on the use of different wavelength lasers with different beam quality and laser power. Requirements outlining which laser for which application has been developed.

ICALEO 2010 Paper #307 (Laser Drilling of Nickel Alloy: Effect of Process Gases on Drilling Time and Hole Quality)

Laser Drilling of Nickel Alloy: Effect of Process Gases on Drilling Time and Hole Quality
Authors:
M M Okasha, Laser Processing Research Centre, School of Mechanical, Aerospace and Civil Engineering, The University of Manchester; Manchester Great Britain
P T Mativenga, Laser Processing Research Centre, School of Mechanical, Aerospace and Civil Engineering, The University of Manchester; Manchester Great Britain
L Li, Laser Processing Research Centre, School of Mechanical, Aerospace and Civil Engineering, The University of Manchester; Manchester Great Britain
H K Sezer, Laser Processing Research Centre, School of Mechanical, Aerospace and Civil Engineering, The University of ...

ICALEO 2010 Paper #306 (Drilling of Aluminum with High Power Q-Switched Lasers)

Drilling of Aluminum with High Power Q-Switched Lasers
Authors:
Leonard Migliore, Coherent, Inc.; Santa Clara CA USA
George Nazary, Coherent, Inc.; Santa Clara CA USA
Presented at ICALEO 2010

Advances in the design of gain modules for diode-pumped solid-state lasers have allowed the manufacture of extremely compact high power products with an output wavelength of 1064nm. Their high Q-switched pulse energy combined with good mode quality also enable highly efficient harmonic conversion, resulting in a product producing several hundred watts of average power at a wavelength of 532nm.

Among the applications for which these products may be suited is the rapid drilling of high-qualit...

ICALEO 2010 Paper #305 (Laser Percussion Drilling of Coated and Uncoated Aerospace Materials with a High Beam Quality and High Peak Power Lamp Pumped Pulsed Nd:Yag Laser)

Laser Percussion Drilling of Coated and Uncoated Aerospace Materials with a High Beam Quality and High Peak Power Lamp Pumped Pulsed Nd:Yag Laser
Authors:
Mohammed Naeem, GSI Group, Inc. - Laser Division; Rugby Great Britain
Presented at ICALEO 2010

Aerospace gas turbines require a large number of small diameter holes (<1mm) to provide cooling in the turbine blades, nozzle guide vanes, combustion chambers and afterburner. Many thousands of holes are introduced in the surface of these components to allow a film of cooling air to flow over the component. Laser percussion drilling with pulsed Nd: YAG laser is now a well-established material processing technique in the aerospace industry. The advan...

ICALEO 2010 Paper #304 (Continous Wave Fiber Laser Keyhole Drilling for the Production of Zero Tapered, Low Recast Holes in Ni-Alloys)

Continous Wave Fiber Laser Keyhole Drilling for the Production of Zero Tapered, Low Recast Holes in Ni-Alloys
Authors:
H K Sezer, Laser Processing Research Centre School of Mechanical. Aerospace and Civil Engineering. The University of Manchester; - USA
L Li, Laser Processing Research Centre, School of Mechanical, Aerospace and Civil Engineering, The University of Manchester; Manchester
S Leigh, Laser Processing Research Centre, School of Mechanical, Aerospace and Civil Engineering, The University of Manchester; Manchester
Z Liu, Laser Processing Research Centre, School of Mechanical, Aerospace and Civil Engineering, The University of Manchester; Manchester
Pres...

ICALEO 2010 Paper #303 (Reliable Laser Micro-Welding of Copper)

Reliable Laser Micro-Welding of Copper
Authors:
Christoph Ruettimann, LASAG AG, C.F.L.; Thun Switzerland
Ulrich Duerr, LASAG AG, C.F.L.; Thun
Anas Moalem, Laserzentrum Hannover e.V; - Germany
Presented at ICALEO 2010

The reliability of copper (spot) welds is still a problem today concerning the high demands of e.g. spot or contact welding for the electronic or medical industry. Two aspects characterising this reliability are tackled: the reproducibility of the weld geometry and the reduction of thermally induced side effects, like sputtering.
One problem in copper welding is the low absorption on a clean polished surface which is about 5% at room temperature at the 1...