Electromagnetic inductive welding method of steel-plastic compound pipe

Abstract

The invention discloses an electromagnetic inductive welding method of a steel-plastic compound pipe, which belongs to a pipeline connecting method. The traditional methods can not realize welding of steel-plastic compound pipes of all specifications. In the method, firstly, the steel-plastic compound pipe is inserted into a connecting port of a pipe fitting; secondly, a steel pipe layer of the steel-plastic compound pipe in the inserting position is heated by an electromagnetic inductive heater to fuse plastics on both sides of the steel pipe layer; and finally, the plastics are cooled to realize welding of the steel-plastic compound pipe and the pipe fitting. Because the steel-plastic compound pipe is inserted into the connecting port of the pipe fitting at first, and then the inserting position is heated for welding, the method is easy. The structures of the pipe fitting and the pipe are not changed, and thus the pipe is easy to be manufactured. The method is suitable for welding of steel-plastic compound pipes of all specifications and the pipe fitting, and is easy to realize double-face seal. In case of water leak or water seepage caused by bad welding quality, the inserting part can be heated again for improvement.

Description

technical field [0001] The invention belongs to a pipeline connection method, in particular to a steel-plastic composite pipe electromagnetic induction heating welding method in which a steel-plastic composite pipe is first inserted into a socket of a pipe fitting, and then the steel pipe layer at the insertion part is heated by electromagnetic induction to realize welding. Connection of steel-plastic composite pipes and pipe fittings in gas, water supply and drainage, chemical, thermal and other systems. Background technique [0002] At present, there are usually two methods of welding by heating plastic to a molten state: [0003] 1. Inserting after hot melting: First, plastic pipe or steel-plastic composite pipe (usually composed of an inner plastic layer, a middle steel pipe layer, and an outer plastic layer, and also includes a plastic layer and a steel pipe layer), The side wall of the pipe fitting socket is heated to a molten state, and then the plastic pipe or steel...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved and the technical task proposed by the present invention are to overcome the defects that the existing welding method is difficult to be used for welding full-size steel-plastic composite pipes and leakage after welding cannot be remedied, and to provide a steel-plastic composite pipe Electromagnetic induction welding method

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