Apparatus and method for inductively heating metallic tubing hav

Details Apparatus and method for inductively heating metallic tubing hav Apparatus and method for inductively heating metallic tubing hav

1976-04-02

1978-06-06

Reynolds, Bruce A.

Electric heating

Metal heating

Of cylinders

219 1041, 219 1071, 219 1075, H05B 506

Patent

active

040938395

ABSTRACT:
There is disclosed herein apparatus and method for heating metallic tubing having a thickened portion, by passing the same through an induction heater energized with power at a relatively high frequency whereby the temperature of the body of the tubing rises at a faster rate than the temperature of the said thickened portion and passing the said tubing through an induction heater energized with power at a relatively low frequency to cause the temperature of said thickened portion of the tubing to rise at a faster rate than the temperature of the body of the tubing, the ratio of the power applied at said low frequency relative to the power applied at said high frequency being such that said body and said thickened portion attain substantially the same predetermined final temperature upon exiting from said apparatus.

REFERENCES:
patent: 2408190 (1946-09-01), Baker
patent: 2444259 (1948-06-01), Jordan
patent: 2669647 (1954-02-01), Segsworth
patent: 3057985 (1962-10-01), Biringer

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