High frequency induction welding with return current paths on su

Details High frequency induction welding with return current paths on su High frequency induction welding with return current paths on su

1978-05-01

1980-04-08

Reynolds, Bruce A.

Electric heating

Metal heating

Of cylinders

219 85, 219 1043, 219 1079, 219106, H05B 500, B23K 1108

Patent

active

041974417

ABSTRACT:
Methods of heating and welding together portions of a metal part or parts in which the portions are positioned in facing, generally parallel and spaced apart relation and an induction coil overlies the part or parts and is positioned so as to induce oppositely flowing currents in the part or parts which flow in two closed paths, one each side of the portions to be heated. The portions may be stationary or be advanced during heating, and after the portions reach welding temperature, they are pressed together to form a weld therebetween. Sides of the coil are spaced from the portions by a distance at least ten times the reference depth of the currents in the metal to permit the currents to flow on the surfaces of the portions which are nearest each other, and the spacing between such surfaces, which is not greater than five times the thickness of one portion, and the current frequency, which is at least 3000 Hz, are selected so that a portion of each current path is on one such surface by reason of proximity effect. Spaced contacts in series with the coil and contacting one portion may be substituted for one side of the coil.

REFERENCES:
patent: 1809468 (1931-06-01), Bornand et al.
patent: 2281805 (1942-05-01), Schenk
patent: 2692322 (1954-10-01), Bennett
patent: 3230337 (1966-01-01), Viart
patent: 3860778 (1975-01-01), Rudd et al.
patent: 3872275 (1975-03-01), Rudd

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