Butt welding technological method for plastic pipes with functional layers

Abstract

The invention discloses a butt welding technological method for plastic pipes with functional layers and belongs to the technical field of composite pipe welding. Each plastic pipe is a composite pipecomposed of an inner wall layer and an outer wall layer, wherein the inner wall layer of the plastic pipe is made of weldable functional materials. The butt welding technological method comprises thefollowing steps that a V-shaped groove and an annular groove are machined in a butt-joint end face of each plastic pipe, end face butt-joint alignment is conducted the two plastic pipes, and the butt-joint end faces are welded. The annular grooves are machined in the end faces of the plastic pipes, thus when the butt-joint end faces of the two plastic pipes are welded, extruded materials of the outer wall layers enter the annular grooves located at the junctions of the inner wall layers and the outer wall layers, and the effect that the inner wall layers are welded into a continuous whole canbe ensured. With the adoption of the butt welding technological method, the problems that after heated, materials of outer wall layers are turned toward the interiors and outer walls of pipelines under the action of welding pressure, and consequently the inner wall functional layers are discontinuous due to flowing extrusion of thicker materials of outer wall layers on plastic of the inner wall functional layers are solved, and usability of the joint of the plastic pipes is ensured.

Description

technical field [0001] The invention belongs to the technical field of composite pipe welding, and in particular relates to a butt welding process for plastic pipes with functional layers. Background technique [0002] With the rapid development of infrastructure, pipes made of various plastics and metal or non-metal reinforcing materials are widely used. With the increase in the application of composite pipes, there are more and more functional pipe materials on the inner wall, but the functional materials on the inner wall are generally not continuous at the interface, resulting in a breakpoint of functional characteristics at the pipe interface. As a continuous pipe butt welding technology, the V-groove processing butt welding process is mentioned in the patent 201510140808.4 A pipe butt welding process for continuous pipe, which is used for continuous welding of steel pipes, but does not specify the functional material of the inner wall How to solve the problem of conti...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a butt welding process for plastic pipes with functional layers, which aims to solve the technical problem that the functional material on the inner wall of the pipe in the prior art cannot be continuous at the pipe interface, and there are breakpoints in functional characteristics

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