Electric heating – Metal heating – Of cylinders
Patent
1986-03-28
1987-03-31
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 1053, 219 1057, 219 1067, 1562742, 1563802, H05B 610
Patent
active
046544950
ABSTRACT:
A method and apparatus for structurally bonding together overlapped portions of sheet metal with a two-stage plastic resin between them. The resin is heated in the first stage to tack together the sheet metal portions by applying alternating current for not more than 15 seconds to an induction coil disposed adjacent one of the sheet portions to heat it to a maximum temperature in the range of 200.degree. F. to 400.degree. F. Preferably, after being tacked together, the sheet metal assembly is painted. In the second stage, the resin is fully cured to structurally bond together the sheet metal portions preferably by heating the entire assembly to a maximum temperature in the range of about 200.degree. F. to 400.degree. F. for a period of 45 to 15 minutes. Alternately, in the second stage the resin can be heated to cure and structurally bond together the sheet metal portions by at least one induction coil to which an alternating current is applied for not more than 15 seconds.
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patent: 4501943 (1985-02-01), Lund
Hutton Roger L.
Williams, Jr. John P.
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