Inductive preheating of upset tubing

Details Inductive preheating of upset tubing Inductive preheating of upset tubing

1981-12-28

1984-05-08

Reynolds, B. A.

Electric heating

Metal heating

Of cylinders

219 1079, 219 1057, 219 1069, H05B 640

Patent

active

044476906

ABSTRACT:
The induction preheating apparatus and methods of the present invention include a furnace for selectively preheating certain portions of irregularly shaped work objects prior to heating to a final uniform temperature in another furnace. The method includes selectively controlling the intensity of the induction magnetic field to provide magnetic field portions of higher intensity adjacent those portions of work objects tending to absorb less energy and magnetic field portions of lower intensity adjacent those portions of the work object tending to absorb energy at a higher rate. The method and apparatus of the present invention are used to achieve substantially uniform temperatures in irregularly shaped work objects after final heating in a main heating furnace.

REFERENCES:
patent: 2905798 (1959-09-01), Freutel
patent: 3649798 (1972-03-01), Seyfried et al.
patent: 3762912 (1973-10-01), Jacquerie et al.
patent: 3827275 (1974-08-01), Suttan et al.
patent: 4093839 (1978-06-01), Moliterno et al.
patent: 4300031 (1981-11-01), Reboux et al.

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