Thermoplastics welding method

Details Thermoplastics welding method Thermoplastics welding method

1975-12-03

1978-05-23

Simmons, David A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156275, 156294, 264 466, 285292, B29C 1906

Patent

active

040908992

ABSTRACT:
A welding method for joining self-supporting structures made of thermoplastics by assembling said structures to form an area of mutual overlap, generating heat in said area to produce a welding zone having an elevated temperature and containing said thermoplastics in an at least plastic state for mutual coalescence of said structures in said area; an expanding agent is provided in the welding zone to generate a gas pressure therein for promoting coalescence of the weld. The invention is particularly suitable for welding tubes and other pipeline elements, such as fittings or sleeves, of thermoplastics and produces a tumescent weld which fills any macroscopic voids while including a plurality of minute closed cell voids.

REFERENCES:
patent: 1427133 (1922-08-01), Taliaferro
patent: 3451696 (1969-06-01), Hagelin et al.
patent: 3506519 (1970-04-01), Blumenitranz
patent: 3788928 (1974-01-01), Wise
patent: 3818085 (1974-06-01), Marsland et al.
patent: 3874067 (1975-04-01), Toyooka et al.
patent: 3900360 (1975-08-01), Leatherman
patent: 3946096 (1976-03-01), Gomort

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