Nd:YAG‐Laser Welding with Dynamic Beam Forming

Abstract

Fuel processor / fuel cell systems for mobile applications are expected to be future mass products. Therefore, fabrication techniques are required, which can cope with high volume production at competitive pricing. Finally, the stainless steel or aluminium reactors and heat‐exchangers will be sealed by automated procedures such as laser welding, limiting the heat impact onto the catalysts applied in the reformers. Laser welding with dynamic beam forming is capable to weld the plate stacks of the heat‐exchanger reliably and mechanically stable to meet the demands of daily operation of such reactors.

Automated and Continuous Production of Microstructured Metallic Plates via Cold Embossing

“…However, as these systems are becoming more and more available on the market, mass production issues become crucial. Advances in this regard have been previously reported, e.g., in catalyst coating [18] and laser welding techniques have also been discussed [20]. Now, significant progress has been achieved with regard to the automation and continuous processing of the individual embossing and forming steps.…”

Microstructured Plate Heat Exchanger Reactors for High Temperature Applications

“…The reactor sealing is performed by a specially adopted laser welding procedure, which creates high quality welding seams by dynamic beam shaping [20]. The reactor sealing is performed by a specially adopted laser welding procedure, which creates high quality welding seams by dynamic beam shaping [20].…”

Microchannel Fuel Processors as a Hydrogen Source for Fuel Cells in Distributed Energy Supply Systems

“…In addition, the fabrication technology required for the production of the fuel processors has been addressed, namely, catalyst coating by screen printing into the microchannels and laser welding for sealing the reactors. 14,15 Below selected examples of this development work will be presented to provide an overview of the scope of activities. (3) represents an alternative processing route to compressed or liquefied hydrogen storage and fuel processing, with the potential to achieve reduced system complexity, provided that the dehydrogenation reaction does not considerably change the combustion characteristics of the fuel.…”

“…All development steps required for building a fuel processor have been addressed, i.e., reactor and system simulation and design, catalyst development, catalyst stability against impurities in the fuel, and setup/testing of complete fuel processors. In addition, the fabrication technology required for the production of the fuel processors has been addressed, namely, catalyst coating by screen printing into the microchannels and laser welding for sealing the reactors. , Below selected examples of this development work will be presented to provide an overview of the scope of activities.…”