Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1986-04-17
1987-08-04
Paschall, M. H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219505, 219535, 219544, 219506, 285292, 285286, 1562742, 1562722, H05B 102
Patent
active
046847898
ABSTRACT:
A method and apparatus for electrically heat welding a thermoplastic fitting having an electric resistance heating element disposed therein whereby a regulated quantity of electric power is supplied to the heating element during the welding process and the making of a high quality weld is insured. In accordance with the method, electric power is supplied to the resistance heating element of the fitting. The impedance and optionally, the resistance of the heating element are measured using low voltage electric power and the size of the fitting to be welded is determined therefrom. The initial magnitude of the current flowing through the heating element is sensed and compared with predetermined current levels for the size of fitting to be welded at various temperatures whereby the total time the controlled electric power should be supplied to the heating element of the fitting for the making of a high quality weld is determined. The magnitude of the current flowing through the heating element over the time the controlled electric power is supplied thereto is sensed at predetermined time intervals and compared with predetermined current levels for the size of fitting being welded to thereby insure the welding process is proceeding correctly.
REFERENCES:
patent: 4147926 (1979-04-01), Stahli
patent: 4334146 (1982-06-01), Sturm
patent: 4349219 (1982-09-01), Sturm
patent: 4486650 (1984-12-01), Bridgstock et al.
patent: 4571488 (1986-02-01), Reeves
patent: 4602148 (1986-07-01), Ramsey
Central Plastics Company
Paschall M. H.
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