Electric heating – Metal heating – Of cylinders
Patent
1980-07-23
1982-11-02
Albritton, C. L.
Electric heating
Metal heating
Of cylinders
219 1079, 219 1077, 219 1061R, 219 1071, 219 1043, H05B 606, H05B 640
Patent
active
043575129
ABSTRACT:
An apparatus for continuous manufacture of butt-welded pipes is constituted by a heating furnace for heating a skelp continuously passed therethrough up to a predetermined temperature less than the butt-welding temperature for the material of the skelp, heaters adjacent the outlet end of the heating furnace and having spaced opposed induction heating coils on opposite sides of the path along which the skelp is passed through the heaters and adjacent the edge portions of the skelp for heating only the edge portions of the skelp discharged from the heating furnace up to the butt-welding temperature. The induction heating coils are such that the electromagnetic coupling between the induction heating coils and the corresponding edge portions of the skelp can be varied to adjust the temperature to which the edge portions are heated. A bending device adjacent the outlet end of the heaters bends the skelp into a generally tubular form, and butt-welding rolls adjacent the outlet end of the bending apparatus apply a predetermined pressure to the bent up skelp for butt-welding the edges of the skelp to each other. A cooling device along the path of the pipe between pairs of contracting rolls cools the seamed portion of the pipe to the temperature of the remainder of the pipe.
REFERENCES:
patent: 2673274 (1954-03-01), Vaughan et al.
patent: 2762892 (1956-09-01), Park
patent: 3648009 (1972-03-01), Steigerwald
patent: 3735084 (1973-05-01), Urbanic et al.
patent: 3824366 (1974-07-01), Garnier
Higuchi Kenji
Machida Nobuo
Nishimoto Koji
Oki Toshiyuki
Albritton C. L.
Leung Philip H.
Sumitomo Kinzoku Kogyo Kabushiki Kaisha
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