PICALO 2008 Paper #905 (Does High Beam Quality of Solid State Lasers Enhance Laser Material Processing? (Invited Paper))

Does High Beam Quality of Solid State Lasers Enhance Laser Material Processing? (Invited Paper)
Authors:
Mohammed Naeem, GSI Group, Inc.; Rugby Great Britain
John Chinn, GSI Group Inc.; Novi MI USA
Bo Gu, GSI Group Inc.; Wilmington MA USA
Presented at PICALO 2008

Lasers have been in use for material processing for decades as a flexible tool for different processes i.e. welding, cutting, drilling, surface modifications etc. Laser material processing offers a number of advantages over other processing technologies, i.e. high processing speeds, low heat input (minimal disruption to the parent material and coatings), low distortion of the parts, better cosmetic appearanc...

PICALO 2008 Paper #904 (New Developments in Co2 Laser Technology Enable New Applications)

New Developments in Co2 Laser Technology Enable New Applications
Authors:
Frank Gaebler, Coherent Inc; Bloomfield CT USA
Presented at PICALO 2008

Sealed off CO2 lasers are proven in industry for high volume manufacturing applications such as cutting and drilling, processing of glass and ceramics, and flexography. Cutting of thin metal, plastic or organic materials like leather, wood, paper textiles has become an established application in the market. Cutting of glass and PCB materials is only now becoming mature. Laser users vary from job shop and automotive to semiconductor manufacturing; from dusty and oily manufacturing floors to clean room environments. In comparison to High Power CO2 lase...

PICALO 2008 Paper #903 (Reliable High-Power Laser Diode Arrays)

Reliable High-Power Laser Diode Arrays
Authors:
Brad Debok, Northrop Grumman Cutting Edge Optronics; St. Charles MO USA
Ed Stephens, Northrop Grumman Cutting Edge Optronics; St. Charles MO USA
Jeremy Junghans, Northrop Grumman Cutting Edge Optronics; St. Charles MO USA
Ryan Feeler, Northrop Grumman Cutting Edge Optronics; St. Charles MO USA
Presented at PICALO 2008

Northrop Grumman / Cutting Edge Optronics has developed a line of microchannel-cooled laser diode arrays in which the coolant is electrically isolated from the current path. As a result, these arrays do not require the use of deionized water. The thermal performance of these arrays is presented and, in one case, shown to far exceed the performance of standard copper microchannel-cooled packages. This sets them apart from other non-DI microchannel coolers currently on the market which typically have worse thermal performance than copper MCCs. These newly-developed coolers are compatible with other technologies developed by NGCEO that enable long lifetimes under harsh operating conditions. In particular, these arrays can be assembled using hard-solder technology that enables power-cycled and high-current operation. The soldering technology also generates arrays that are easily lensed and satisfy a wide range of direct diode needs, including welding, marking, and complex line generation applications. These microchannel-cooled arrays represent an important next step in the solid state laser industry. They allow for much simpler (non-deionized) cooling systems while maintaining excellent thermal performance and lifetime.

PICALO 2008 Paper #902 (The Design Method of High-efficiency Coupling of Fiber for the High-power Solid Laser)

The Design Method of High-efficiency Coupling of Fiber for the High-power Solid Laser
Authors:
Baohua Wang, Institute of Laser Engineering of Beijing University of Technology; Beijing Peoples Republic of China
Menghua Jiang, Institute of Laser Engineering of Beijing University of Technology; Beijing USA
Kai Pang, Institute of Laser Engineering of Beijing University of Technology; Beijing Peoples Republic of China
Li Qiang, Institute of Laser Engineering of Beijing University of Technology; Beijing Peoples Republic of China
Yongling Hui, Institute of Laser Engineering of Beijing University of Technology; Beijing Peoples Republic of China
Presented at PI...

PICALO 2008 Paper #808 (The Absorptance of Metal Surfaces to Nd:YAG/Nd:YLF Laser Light)

The Absorptance of Metal Surfaces to Nd:YAG/Nd:YLF Laser Light
Authors:
D. Bergstrom, Mid Sweden University; Ostersund Sweden
John Powell, Lulea University of Technology; Lulea Sweden
Alexander Kaplan, Lulea University of Technology; Lulea Sweden
Presented at PICALO 2008

The absorptance of real metallic engineering surfaces used in Laser Material Processing depends strongly upon the particular surface conditions, including the degree of roughness and oxidation. In this paper the influence of surface topography on Nd:YAG/Nd:YLF laser absorptance has been studied, both experimentally and theoretically, on a set of randomly selected as-received metallic engineering surfac...

PICALO 2008 Paper #806 (Three Dimensional Analytical and Finite Element Methods for Simulating a Moving Melt Pool with Mass Addition)

Three Dimensional Analytical and Finite Element Methods for Simulating a Moving Melt Pool with Mass Addition
Authors:
Andrew Pinkerton, The University of Manchester; Manchester Great Britain
Alhaji Kamara, The University of Manchester; Manchester Great Britain
Kamran Shah, The University of Manchester; Manchester M60 1Qd Great Britain
Shakeel Safdar, Pakistan National University of Sciences and Technology (Nust); Risalpur Pakistan
Lin Li, The University of Manchester; Manchester Great Britain
Presented at PICALO 2008

Laser Direct Metal Deposition, alloying and similar multiple layer additive processes are recognised as difficult to model becau...

PICALO 2008 Paper #805 (Heat Transfer and Fluid Flow during Double-track Laser Cladding of H13 Tool Steel (Invited Paper))

Heat Transfer and Fluid Flow during Double-track Laser Cladding of H13 Tool Steel (Invited Paper)
Authors:
Jyoti Mazumder, University of Michigan ; Ann Arbor MI USA
Xiuli He, University of Michigan; Ann Arbor MI USA
Presented at PICALO 2008

Laser cladding based Direct Metal Deposition (DMD) has received significant attention due to its diversified potential for material processing, such as innovative alloying, metallic coating, rapid prototyping and components repairing. Numerical simulation not only helps to understand the complex physical phenomena and the underlying theory involved in this process, it can also be used in the process prediction and system control. The evolution ...

PICALO 2008 Paper #802 (Therotical and Experimental Research on Temperature Field of Coaxial Powder Flow in Laser Cladding)

Therotical and Experimental Research on Temperature Field of Coaxial Powder Flow in Laser Cladding
Authors:
Xichen Yang, Laser Processing Center,Tianjin Polytechnic University; Tianjin Peoples Republic of China
Zhe Dong, Tianjin Polytechnic University; Tianjin Peoples Republic of China
Li Li, Tianjin Polytechnic University; Tianjin Peoples Republic of China
Presented at PICALO 2008

Threr are three phsical processing of heat transfer,mass trasfer and convection in coaxial powder flow. Temperature field of coaxial powder
is important for laser manufacturing.Computer simulation of temperature field has been made from two phases flow of powder/gas.Experimental measuremet ...

PICALO 2008 Paper #708 (Study on Welding Characteristics of Combining Laser Welding and Resistance Seam Welding Joined Ti6Al4V Alloy Lap Joints)

Study on Welding Characteristics of Combining Laser Welding and Resistance Seam Welding Joined Ti6Al4V Alloy Lap Joints
Authors:
Xinge Zhang, Harbin Institute of Technology; Harbin Peoples Republic of China
Liqun Li, Harbin Institute of Technology,; Harbin Peoples Republic of China
Zhenglong Lei, Harbin Institute of Technology; Harbin Peoples Republic of China
Yanbin Chen, Harbin Institute of Technology; Harbin Peoples Republic of China
Presented at PICALO 2008

With deep penetration laser welding of lap joint and tee-joint, porosity is apt to occur and melting width at lap interface is too narrow to support high shear load; on the other hand, the process n...

PICALO 2008 Paper #707 (Guidance and Stabilisation of Electric Arc Welding using Nd:Yag Laser Radiation)

Guidance and Stabilisation of Electric Arc Welding using Nd:Yag Laser Radiation
Authors:
Christian Stahlhut, Laser Zentrum Hannover ; Hannover Germany
Jörg Hermsdorf, Laser Zentrum Hannover e.V:; Hannover Germany
Rainer Kling, Laser Zentrum Hannover ; Hannover Germany
Alexander Barroi, Laser Zentrum Hannover E.V.; Hannover Germany
Frank Otte, Laser Zentrum Hannover E. V. ; Hannover Germany
Presented at PICALO 2008

The trend in production industry to lightweight construction using aluminium and high and higher strength steels calls for faster, yet stable production processes. To realise these requirements, we have developed a gas metal arc wel...