Method of inductively heating workpieces to a uniform temperatur

Details Method of inductively heating workpieces to a uniform temperatur Method of inductively heating workpieces to a uniform temperatur

1982-09-20

1984-02-21

Envall, Jr., Roy N.

Electric heating

Metal heating

Of cylinders

219 85, 219 95, 219 1053, 219 1067, H05B 606

Patent

active

044332270

ABSTRACT:
A heat exchanger assembly is formed of spaced parallel headers connected by an array of spaced flat tubes each in a plane perpendicular to the headers. The header and tube material is clad with a brazing alloy which melts at a temperature slightly below the melting point of the base material. Sinuous metallic ribbons fill the spaces between the flat tubes. The assembly is induction heated by a low frequency alternating magnetic field having its flux lines extending transversely of the tubes and headers and at oblique angles thereto, the angles being selected to cause equal heating thereof for obtaining a uniform temperature throughout the assembly to effect the melting of the alloy and the brazing of the joints. Heat panels heated by the magnetic field to a temperature near that of the assembly are placed opposite outer surfaces of the assembly as required to avoid a radiation loss which would cause a significant temperature differential. Heat panels are also used in the brazing of a heat exchanger assembly comprising a stack of contoured plates to attain uniform heating of the assembly.

REFERENCES:
patent: 2448690 (1948-09-01), Storm
patent: 2684425 (1954-07-01), Vickland
patent: 3251976 (1966-05-01), McBrien
Welding Journal; Nov. 1959; pp. 1059-1069; Libsch, Joseph and Capolongo, Pat.; "High-Frequency Induction Brazing and Soldering".

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