ICALEO 2006 Paper #410 (Multifunctional Hand-held Laser Processing Device)

Multifunctional Hand-held Laser Processing Device
Authors:
Andreas Ostendorf, Laser Zentrum Hannover e.V.; Hannover Germany
Christian Hennigs, Laser Zentrum Hannover e.V.; Hannover AL Germany
Oliver Meier, Laser Zentrum Hannover e.V.; Hannover Germany
Heinz Haferkamp, Laser Zentrum Hannover e.V.; Hannover Germany
Presented at ICALEO 2006

For the economical dismantling of nuclear installations, modular cutting systems are necessary to enable a low-emission cutting process particularly for high sheet thicknesses. Hand-held laser processing devices offer this possibility with a flexible implementation. In this paper, a new developed hand-held laser processing device will be presented, which applies a novel bifocal optic, a special cutting system with two gas laval nozzles and makes a multifunctional application area available. Laser notching, cutting, material removal and prenotching in combination with laser cutting are already possible with this system. Extended modules for surface treatments and welding applications are under development. Besides its many fields of application, the processing device HLG 3000-sk-df offers additionally wide adaptation possibilities in a very light (3.5 kg) and compact design. This can be realised with the special mirror geometry, which combines a beam deflection mirror and a focusing lens. For the first time, the novel bifocal optic enables the laser prenotching and cutting in one cycle by using a hand-held laser processing device. The double focus configuration of the laser beam results from the splitted mirror design. The cutting system based on two gas laval nozzles constitutes a high potential for laser cutting applications resulting in high cutting qualities also for high sheet thicknesses and avoiding burr adhesion.

ICALEO 2006 Paper #501 (Fault-tolerant Laser Welding in Automotive Industries)

Fault-tolerant Laser Welding in Automotive Industries
Authors:
Alexander Grimm, Bayerisches Laserzentrum gGmbH; Erlangen Germany
Christian Kägeler, Bayerisches Laserzentrum gGmbH; Erlangen Germany
Florian Albert, Bayerisches Laserzentrum gGmbH; Erlangen Germany
Michael Schmidt, Bayerisches Laserzentrum gGmbH; Erlangen Germany
Presented at ICALEO 2006

Laser welding is increasingly gaining importance in the automotive industry. The main advantages are the high flexibility of the process as well as the high possible welding speeds (up to 8 m/min for lap joints of two steel sheets with 0.8 mm thickness). As a protection against corrosion, zinc-coated or oil-...

ICALEO 2006 Paper #502 (Effect of Processing Parameters on Zero-Gap Laser Welds Made on Multi-Coated Steel)

Effect of Processing Parameters on Zero-Gap Laser Welds Made on Multi-Coated Steel
Authors:
Ashish Dasgupta, CLAIM University of Michigan; Ann Arbor MI USA
Jyoti Mazumder, CLAIM, University of Michigan; Ann Arbor MI USA
Presented at ICALEO 2006

We are presenting a study on zero-gap CO2 laser lap welding of multi-coated steel using alloying additive. Steel coated with multiple elements like zinc, nickel, aluminum, epoxy resin etc., being considered for use in gas tanks for newer alternative fuels, was experimented and the effects of welding parameters on properties like porosity, hardness, corrosion resistance etc. was investigated. L-9 Taguchi experiment design was used in this stu...

ICALEO 2006 Paper #504 (Nd:YAG Laser Welding of AZ31 Sheet for Car Industry)

Nd:YAG Laser Welding of AZ31 Sheet for Car Industry
Authors:
Mok-Young Lee, RIST; Pohang Korea
Byung-hyun Yoon, RIST; Pohang Korea
Woong-seong Chang, RIST; Pohang Korea
Presented at ICALEO 2006

Magnesium alloys are becoming important material for light weight car body, due to their low specific density but high specific strength. However they have a poor weldability, caused high oxidization tendency and low vapor temperature. In this study, the welding performance of magnesium alloy was investigated for automobile application. The material was rolled magnesium alloy sheet contains 3wt%Al, 1wt%Zn and Mg balance. The effects of process variables were investigated on 2kW ...

ICALEO 2006 Paper #505 (Laser Roll Welding of Dissimilar Metal Joint of Zinc Coated Steel and Aluminum Alloy)

Laser Roll Welding of Dissimilar Metal Joint of Zinc Coated Steel and Aluminum Alloy
Authors:
Hitoshi Ozaki, Nagoya University; Nagoya Japan
Muneharu Kutsuna, Nagoya University; Nagoya Japan
Presented at ICALEO 2006

There is a problem to reduce the car body weight for improving fuel consumption and CO2 generation. As one of the solution, the multi material body concept using aluminum alloys and high strength steels is proposed recently. Therefore, new welding processes by which these dissimilar materials can be joined in high reliability and productivity is demanded. Laser Roll Welding was developed for joining of dissimilar metals by M.Kutsuna and M.Rathod in 2002. In the present ...

ICALEO 2006 Paper #506 (Laser Brazing Phenomena of Galvanized Steel and Pit Formation Mechanism)

Laser Brazing Phenomena of Galvanized Steel and Pit Formation Mechanism
Authors:
Masami Mizutani, Joining and Welding Research Institute; Osaka Japan
Seiji Katayama, Joining and Welding Research Institute; Osaka Japan
Seita Kimura, Joining and Welding Research Institute, Osaka University; Osaka Japan
Shinsuke Takemura, NISSAN MOTOR CO.; Kanagawa Japan
Presented at ICALEO 2006

Laser brazing technology for Zn-coated steels with a copper alloy wire receives considerable attention due to its many advantages such as good mechanical properties, good alloyability with zinc, improved gap tolerance, and so on in automotive industries. However, defects such as pits...

ICALEO 2006 Paper #601 (Through-Transmission Welding of Polymers: Effects of Particles on Laser Beam Scattering)

Through-Transmission Welding of Polymers: Effects of Particles on Laser Beam Scattering
Authors:
A Nichici, University of Timisoara; Romania
JC Kneip, LTm Laboratory; CHALON SUR SAONE France
M Ilie, LTm - IUT Le Creusot; Le Creusot France
Simone Mattei, LTm - IUT Le Creusot; Le Creusot France
Presented at ICALEO 2006

Among all the assembling processes of thermoplastic materials, through-transmission laser welding is becoming more and more frequently used for industrial applications. In this process, laser beam energy may be deposited directly into the structure, at the interface between a semi-transparent and an opaque slabs. Induced heating at the inter...

ICALEO 2006 Paper #602 (Optimizing Weld Joint Design for Bond Strength and Functional Properties in Laser Welding of Polymers)

Optimizing Weld Joint Design for Bond Strength and Functional Properties in Laser Welding of Polymers
Authors:
Robert Mueller, Dofasco Inc.; Hamilton ON Canada
Hongping Gu, Powerlasers - ATC; Kitchener ON Canada
Presented at ICALEO 2006

The ability of lasers to weld polymers has been known for many years, but the level of acceptance of the process by industry lags far behind the acceptance of laser welding of metals. As with laser welding of metals, optimum joint performance is obtained when the joint configuration is designed for laser welding. Weld joint performance characteristics may include bond strength, leakage rate, process cycle time, part fit-up tolerances, and interfac...

ICALEO 2006 Paper #603 (A Novel CO2 Laser Welding of Plastics Using a Transparent Solid Heat Sink without Causing Thermal Damage)

A Novel CO2 Laser Welding of Plastics Using a Transparent Solid Heat Sink without Causing Thermal Damage
Authors:
Kimitoshi Sato, Hiroshima Institute of Technology; Hiroshima Japan
Tomoya Matayoshi, Mitsui Chemicals Inc.; Sodegaura Japan
Yasuo Kurosaki, Universitu of Electro-communications; Chofu, Tokyo Japan
Presented at ICALEO 2006

The paper introduces the concept of a novel CO2 welding of thermoplastics used in medical appliances and micro-scale devices. The procedure has a few features: (1) to place a solid heat sink transparent to a CO2 laser beam in contact with an irradiated plastic to cool the surface during welding process, (2) to use no pigmentation or dye fo...

ICALEO 2006 Paper #604 (Development of Direct Laser Joining for Metal and Plastic)

Development of Direct Laser Joining for Metal and Plastic
Authors:
Akio Tange, Toyobo Co., Ltd,; Shiga Japan
Yousuke Kawahito, Osaka University; Ibaraki Japan
Shyuji Kubota, Toyobo Co., Ltd; Shiga Japan
Seiji Katayama, Osaka University; Japan
Presented at ICALEO 2006

Recently simultaneous pursuit of economic development and environmental preservation has been one of the most important issues for establishment of sustainable gravel production. It is well known that metals are strong and ductile and plastics are light and flexibly formable. Therefore, joining metals and plastics is outstandingly worthy of note; however, the joining with adhesion bonds (g...