Method for heated tool butt welding of tube and pipe of thermopl

Details Method for heated tool butt welding of tube and pipe of thermopl Method for heated tool butt welding of tube and pipe of thermopl

1979-07-09

1981-09-08

Ball, Michael W.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

1563042, 1563045, 1563046, B65H 6900

Patent

active

042882664

ABSTRACT:
In a method for heated tool butt welding of pipe consisting of a thermoplastic material by placing or pressing the surfaces to be joined of the pipes to be welded into contact with a heated tool to form an inner weld bead at each end to be joined, subsequently heating the surfaces at a reduced contact pressure to the welding temperature and fitting the surfaces together under pressure after having removed the heated tool, the improvement for minimizing the formation of a protrusion within the resultant pipes which comprises pressing an elastic insert against the inner weld bead while joining said surfaces of said pipe together.

REFERENCES:
patent: 3013925 (1961-12-01), Larsen
patent: 3022209 (1962-02-01), Campbell

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