Leibniz Universität Hannover Faculty Faculty of Mechanical Engineering
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Institute of Materials Science
 
Institute for Material Science Institute Work Groups

Joining technology - soldering and thermal process technology

Brazing and high-temperature brazing are indispensable for the industrial production of complex, highly stressable components. Our brazing technology research activities are aimed at developing more efficient, resource-saving brazing processes without the use of fluxes. This includes both the further development of related process technology and the development of new brazing materials and brazing application processes for a wide range of applications, such as the brazing of components made of aluminum alloys, non-ferrous metals or high-alloy steels, or the active brazing of metal-ceramic joints for the manufacture of high-performance tools. An essential aspect of our process and materials development is the use of physical models to define and validate experimental parameters.

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Brazing and high-temperature brazing are indispensable for the industrial production of complex, highly stressable components. Our brazing technology research activities are aimed at developing more efficient, resource-saving brazing processes without the use of fluxes. This includes both the further development of related process technology and the development of new brazing materials and brazing application processes for a wide range of applications, such as the brazing of components made of aluminum alloys, non-ferrous metals or high-alloy steels, or the active brazing of metal-ceramic joints for the manufacture of high-performance tools. An essential aspect of our process and materials development is the use of physical models to define and validate experimental parameters.

CURRENT RESEARCH PROJECTS

  • Development of TLP solders for brazing copper and steel materials at 750 to 850°C
  • Development of a brazing-nitriding hybrid process in a continuous furnace for the serial production of water-cooled bipolar plates made of chrome-plated materials
  • Silane-doped process gases for the generation of vacuum-adequate process conditions in inert gas continuous furnaces
  • Clarification of the mechanisms for surface activation during flux-free brazing of high-alloy steel materials under inert gas and in a vacuum
  • Influence of brazing process atmosphere and process time on the fatigue limits of high-temperature brazed CrNi steel joints
  • Development of a continuous inert gas furnace process with heat recovery ventilation

Facilities:

  • Inert gas continuous furnace from Kohnle for process temperatures up to 1200 °C in N2/H2/Ar atmosphere with/without silane mixing
  • Hochvakuumofen mit Schnellabkühlung von der Fa. PVA für Prozesstemperaturen bis 1250°C
  • Sliding-table flame brazing system with 6 burners from Everwand & Fell
  • Testing facility for inductive brazing in shielding gas with variable shielding gas mixture for the operation with/without silane-containing process gases
  • Various batch furnaces for heat treatment in air or in shielding gas

Facility Specifications Soldering Technology

Conveyor Belt Protective Gas Continuous Furnace
High Vacuum Furnace
Flame Soldering Stand

Tubular Furnace

For laboratory tests under variable process gas conditions, IW operates a tubular furnace with quartz glass muffle, automated gas mixing device and furnace control at the site in Witten. Heat treatments up to 1100°C can also be carried out here with reactive process gases.

Induction Brazing Machine

Induction brazing tests are carried out in a self-built laboratory facility. The testing facility is suitable for inductive brazing in protective gas and is equipped with a variable protective gas admixture for operation with/without silane-containing process gases for this purpose. The components are heated with a water-cooled inductor, which is operated by means of an RF generator with an adjustable frequency range between 50 and 450 kHz and a maximum power of 3000 W (i-class 1.5/3 kW, Cobes GmbH, Weisweil, Germany).

CONTACT PERSON FOR JOINING TECHNOLOGY – BRAZING AND THERMAL PROCESS TECHNOLOGY

apl. Prof. Dr.-Ing. habil. Kai Möhwald
Management
Phone
+49 230 2661 660
Fax
+49 230 2661 650
Email
moehwaldiw.uni-hannover.de
Address
Stockumer Straße 28
58453 Witten
apl. Prof. Dr.-Ing. habil. Kai Möhwald
Management
Phone
+49 230 2661 660
Fax
+49 230 2661 650
Email
moehwaldiw.uni-hannover.de
Address
Stockumer Straße 28
58453 Witten

Last Change: 06.05.24 Print

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