Patent ID: 6994766
Filing Date: 2006-02-07
Classification: B23B,B26D,B29C,B29L,Y10T

Abstract:
1. A method for joining a first plastic pipe to a second plastic pipe with at least a partially recessed internal bead comprising: placing said first plastic pipe in a holder; cutting said first plastic pipe substantially perpendicular to the axis of said first pipe with a profile that reduces the wall thickness of said first pipe with an undercut region on the internal side of said first pipe; cutting said second plastic pipe substantially perpendicular to the axis of said second pipe with a profile that reduces the wall thickness of said second pipe with an undercut region on the internal side of said second pipe; heating the ends of said first pipe and second pipe substantially simultaneously; and forcing said first pipe and second pipe together to form a weld, said weld having a bead that is substantially recessed within only a portion of said undercut region of said first pipe and within only a portion of said undercut region of said second pipe.