FIELD: construction engineering; erection and repair of various pipe lines.
SUBSTANCE: end hole of hollow profiled is closed and end of pipe takes form of smooth stepped surface. Pipes to be connected are straightened. During preparation of pipe, profile is cut along inner surface of side wall which is secured to nearest turn, thus ensuring double thickness of wall. Then, end of profile is cut out forming section at right or obtuse angle having similar magnitude for all ends of pipes. Disk-shaped welding ring is inserted into slot between two pipes. This ring has loop of resistance wire coated with tubular insulation. Two pipes are centered by means of inner and outer end supports. Ends of pipes are compressed and resistance wire of welding ring is connected with current source for heating the thermoplastic which is molten forming weld seam; then weld seam is cooled and end supports are removed.
EFFECT: extended field of application.
14 cl, 12 dwg
