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Impeder for HF inductive welding of steel tubes

Impeder for HF inductive welding of steel tubes

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The paper deals with a new impeder for HF inductive welding of steel tubes. Experimental research has been carried out on generators with impeders made of ferrite. The authors introduce magneto dielectric Fluxtrol instead of ferrite and thus project a new impeder. On the basis of many years of experimental research with impeders, significant energy savings have been achieved when welded in comparison with various ferrite and other impeders. Such savings and welding with less power make it possible for increased production speed of welded tubes.

Inspec keywords: electric welding; steel; electric current; welding equipment; induction heating

Other keywords: HF inductive welding; steel tubes; ferrite impeders; production speed; impeder function; Fluxtrol magneto dielectric impeders; internal contour currents; inductor; impeder; generator impeders; welded tubes; external contour currents; V loop inductive current; energy savings

Subjects: Joining processes and welding; Power applications in manufacturing industries; Process heating

References

    1. 1)
      • J. Wright . Principles of high frequency induction tube welding. Electronic Heating Equipment , 1 - 8
    2. 2)
      • D. Guljajev . (1984) Soveršenstvovanie tehnologii proizvodstva i povišeniie kačestvo elektrosvarnyh trub.
    3. 3)
      • Milicevic, M.: `Avtomatičeskoe upravlenie processom indukcionnoi svarki trub s primeneniem mikro-EVM', 7thMeždunarodnoja konferencija stran členov SEV i SFRJ po avtomatizacii proizvodstvenyh processov i upravlenija v černoi metalurgii, 1988, Ždanov, SSSR.
    4. 4)
      • TDK, Italy, `TDK impeder core', 1999, Technical documentation.
    5. 5)
      • Mitani, K., Shibua-ku, H.: `Impeder: ‘How its innovation and design impacts the welding processes', The Eight Annual World Tube Congress, 9-12.11.1992, Chicago, Illinois, p. 35–33.
    6. 6)
      • Electronic Heating Equipment, Inc., Buckley, WA, `Catalog Applications Guide: Impeders, work coils, ferrite, casing', 1998, p. 1–20.
    7. 7)
      • I.V. Rudnev . (1997) Induction heat treatment, Steel Heat Treatment Handbook.
    8. 8)
      • N.A. Šamov , V.I. Lunin , N.V. Ivanov . (1977) Vysokočastotnaja svarka metalov.
    9. 9)
      • Fluxtrol Manufacturing, MI, USA, `Fluxtrol Manufacturing: Magnetic flux concentrators for high frequency induction heating', 1996.
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