Title: Induction heating method and apparatus
Application Number: 86101419 Application Date: 1986.03.06
Publication Number: 1003502 Publication Date: 1986.09.24
Approval Pub. Date: 1992.12.16 Granted Pub. Date: 1992.12.16
International Classifi-cation: C21D9/60;H05B6/44
Applicant(s) Name: N.V. Bekaert S.A. Address:
Inventor(s) Name: Goodfried Vanneste;Michel Neirynck
Attorney & Agent: LI QIANG
Abstract:
    In the induction heating of thin (e.g. 0.5 to 3 mm diameter) steel wires (W) in continuous heating processes, relatively low field strengths of e.g. up to 20,000 Am-1 are employed but are chosen so as to set the relative magnetic permeability mu r at 40 or more. The wire are passed through coil blocks (1), which are wound flat around a row of ceramic tubes to guide and insulate the wires. The coil blocks are energized at frequencies typically up to 30 kHz. The direction of winding and/or the phase of the current is changed between adjacent coil blocks, or groups of blocks, to reduce voltage build-up along the wires.
Time: 9