Method and apparatus for welding conduits

Details Method and apparatus for welding conduits Method and apparatus for welding conduits

1982-12-15

1987-02-10

Simmons, David

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156 64, 1562742, 156352, 156366, 156368, 156378, 219490, 219492, 219497, B32B 108

Patent

active

046421548

ABSTRACT:
A heating wire embedded in any one of several types of shaped elements is fed current by an electrical control apparatus for a time interval which is a function of the ohmic resistance of the wire and the type of shaped element. The type and resistance are automatically determined in advance by measurement of the wire impedance which indicates type and of the ohmic resistance. Welding time is selected from a predetermined directrix depending on resistance, and the directrix itself is chosen on the basis of type by the impedance measurement. A count representative of the time is stored in a counter and pulsed down to zero while current is delivered.

REFERENCES:
patent: 3564204 (1971-02-01), Mense
patent: 3578518 (1971-05-01), Gregg et al.
patent: 3600247 (1971-08-01), Armstrong, Jr.
patent: 4056208 (1977-11-01), Soodak et al.
patent: 4275345 (1981-06-01), Tait
patent: 4349397 (1982-09-01), Sturm

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