Resistance heaters

Details Resistance heaters Resistance heaters

1987-03-02

1988-06-28

Goldberg, E. A.

Electric heating

Heating devices

With heater-unit housing, casing, or support means

219552, 219553, 338141, 338218, 338282, 338294, 338296, 338298, 338302, 338318, 373130, 373134, H05B 306, H01C 312

Patent

active

047541245

ABSTRACT:
A resistance heater for performing heat treatment of the braze-affected area of a metallic sleeve attached by brazing within and to a metallic tube, comprises a metal tube (10) of which a portion (16) is formed with a spiral groove (11) which penetrates the wall thickness of the tube (10) and thereby defines a heating coil. The radial thickness of the convolutions of the coil varies lengthwise of the coil so that, when energized with electrical current, the coil develops a temperature profile which is determined by the variation in radial thickness. The temperature profile may be selected according to the needs of the brazed joint to be heat treated.

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