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Steigerwald Strahltechnik GmbH
  • Company
    • Steigerwald Strahltechnik GmbH
      • Our objective – satisfied customers worldwide. The physicist Dr. h.c. Karl-Heinz Steigerwald builds the first electron beam processing machine in 1952 and founded the company Steigerwald Strahltechnik GmbH.

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  • EB technology
    • eb technology
      • Within the GBT Group, Steigerwald Strahltechnik GmbH is the specialist for chamber machines designed for electron beam welding and electron beam drilling purposes, as well as for EB generators in high voltage technology (up to 150 kV and over).

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      • Advantages
      • Laser welding vs. electron beam welding
      • Energy efficiency in welding technology
      • Research and development
      • History of EB technology
      • Electron Beam Generator
      • Glossary
      • Chamber machines designed for electron beam welding and electron beam drilling

        Specialist for chamber machines designed for welding and drilling purposes

        Electron beam technology

        EB generators in high voltage technology

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    • Electron Beam Machines
      • The reliable high-tech processes for your production! EB welding and drilling technology was introduced to industry many years ago as a reliable means of fabrication.

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      • EBOCAM®
      • EBOMOVE
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      • EBOCONT Continuous welding machines
      • EBOGEN Generators
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      • Request for EB welding machine
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        Electron beam systems

        Continuous welding machines EBOCONT®

        Continuous welding machines EBOCONT®

  • Application areas
    • Steigerwald Application areas
      • The electron beam (=EB) is a universal tool for processing metallic materials by electron beam welding, EB drilling and electron beam surface treatment and has been used in industry for many years.

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      • Welding
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      • Electron beam technology

        Electron beam technology

        Electron beam technology

        Welding • Surface Treatment • Drilling

        Welding at atmosphere

        Welding at atmosphere

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    • Job shop with electron beam technology
      • Relieve your resources and increase your efficiency!

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      • job shop with EB technology
      • Job shop with EB technology

        Job shop with EB technology

  • References
    • SST References
      • SST EB welding machines (EB = electron beam) are ideally suitable for the industrial production of work pieces. They are used everywhere when complex components are welded with a maximum requirement for precision and durability.

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      • Cern
      • TWI Cambridge
      • Lufthansa Technik
      • EADS
      • Listemann AG
      • SwissBeam AG
      • Referenzen der Steigerwald EB Technik
        Referenzen der Steigerwald EB Technik
        Referenzen der Steigerwald EB Technik
        Referenzen der Steigerwald EB Technik
        Referenzen der Steigerwald EB Technik
        Referenzen der Steigerwald EB Technik
        Referenzen der Steigerwald EB Technik
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      • There are many aspects to the electron beam technology and the electron beam welding. Not everything can be dealt with on our webpages.

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welding with electron beam

Non-vacuum welding with electron beam (NVEBW)

At present, non-vacuum electron beam welding is mainly used in Germany for welding aluminium, e.g. for cockpit carriers made of aluminium.

The NVEBW method is advantageous for the increased use of super high strength fine metal plates in industry. So, it is possible to achieve high welding speeds and it allows lightweight designs to be conceived using a combination of various types of materials, e.g. joining aluminium and steel.

As the energy input can be precisely controlled, stable weld-solder joints can be made (in this case the steel remains hard and the aluminium is fused to it).

Process principle

Also, at this process the electron beam is generated in the high-vacuum EB generator. But for the NVEBW method the formed beam is "guided out" then to the free atmosphere passing some fine nozzles which separate the different pressure stages.

Due to the collisions of the electrons with the atmosphere's particles the electron beam widens gradually at increasing working distance (nozzle - workpiece). However, within the recommended distance the energy density of the beam is still strong enough to produce a key-hole welding process.

With respect to the application this method distinguishes to the in-vacuum EB welding process by avoiding any vacuum chamber for workpiece handling. So, the user can save the evacuation time and effort, and even large components can be welded economically. The workpiece can be moved on an X/Y table or with the use of a robot under the electron beam. Depending on the application, the EB generator can also be moved.

Only to protect from the danger of X-rays (generated in each EB process) the working area of a NVEBW machine has to be shielded by adopted lead walls.

The shown sketch illustrates the electron beam generation system.

  1. High vacuum area
    about 10-4 mbar by a turbo-molecular pump or oil-diffusion pump
  2. Beam generator
    optimized to suppress arcings
  3. Pressure stage 2 ca. 10-2 mbar
  4. Pressure stage 1 approx. 1 mbar
  5. Workpiece
    at atmosphere pressure, about 10 - 25 mm distance to beam nozzle

electron beam

Advantages of the method

Electrical wall-plug efficiency > 50% (incl. all auxiliaries)
Energy absorption on the workpiece nearly independent on kind of material, surface state, angle of incidence, moving direction
Weldable sheet thicknesses 0.5 to 10 mm, in special cases even more
Edge preparation for butt welds regular cut
Able to bridge gaps up to 20% of the sheet thickness, 0.5 mm maximum (without filler),
no weld sink when thicknesses are combined
application of filler wire possibly
Edge-mismatch capability up to half sheet thickness
Welding speed generally very high, depending on material and thickness/depth;
for example on Al alloy: 14 m/min at 3 mm depth;
60 m/min at 1 mm depth
Seam width Minimum 1 mm, up to 4 mm at larger thicknesses
Energy input per length comparable small, narrow HAZ
Minimum heat input less hardness, minimum part's distortion
Beam to part tolerances sideways up to 20% of the sheet thickness
Maximum deviation in working distance up to 10% of set value

Technique

Available beam power maximum 30 kW
Beam control by CNC, in common with the weld path
High voltage 175 kV, switch mode, nearly interruption free
Welding parameters programmable, controlled, supervised
Operation by a convenient and clear touch panel
X-ray protection < 1 µSv/h by adopted (tailored) lead shielding
Beam guidance using Helium effluence

Consumption / Maintenance

Electrical Energy 3 x 400 V, 50/60 Hz, PEN
15 kW (for basic consumption) plus welding power
Wear parts cathodes and nozzles, exchange needs
depend on working conditions
(e.g. 60 hours at 60% on-time),
exchange takes 30 min
Further consumption Compressed air, Helium (4.6), pump oils, sealings

welding with electron beam

Example of a NVEBW machine

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  • Home
  • Company
    • STEIGERWALD STRAHLTECHNIK GMBH
    • News
    • Location
    • Jobs
    • International sales service
    • Aftersales service
    • GBT-Group
  • EB technology
    • Electron Beam Machines
    • Advantages
    • Laser welding vs. electron beam welding
    • Energy efficiency in welding technology
    • Research and development
    • History of EB technology
    • Electron beam generator
    • Glossary
  • Machines
    • Electron Beam Systems
    • EBOCAM®
    • EBOMOVE
    • EBOPULS Perforation machines
    • EBOCONT Continuous welding machines
    • EBOGEN Generators
    • Used machines
    • Request for EB welding machine
  • Application areas
    • Steigerwald Application areas
    • Welding
    • Additive Manufacturing
    • Drilling
    • Surface treatment
    • Welding at atmosphere
  • Job-shop
    • Job shop with EB technology
  • References
    • SST References
    • Cern
    • TWI Cambridge
    • Lufthansa Technik
    • EADS
    • Listemann AG
    • Electron beam welding - SwissBeam AG
  • Info center
    • SST Info center
    • Videos
    • Exhibitions & Events
    • Downloads center
    • Directions / Contact
    • Terms and conditions
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