Method for manufacturing defect simulation test block for polyethylene pipe hot-melt welded joint

Abstract

The invention discloses a method for manufacturing a defect simulation test block for a polyethylene pipe hot-melt welded joint, which comprises the following steps of: 1, selecting a defect-free polyethylene pipe to manufacture a defect prefabricated pipe and a butt joint pipe, and prefabricating defects at one end of the defect prefabricated pipe according to the defect type of the hot-melt welded joint to form a defect distribution end, wherein the prefabricated defect is in a standard shape; 2, enabling the defect distribution end of the defect prefabricated pipe and the butt joint pipe to be subjected to hot melting welding, and forming a hot-melt welded joint; and axially cutting the defect prefabricated pipe and the butt-joint pipe which are subjected to hot-melt welding to form the polyethylene pipe hot-melt welded joint defect simulation test block. In the defect prefabrication process, the defect character is standardized into a regular shape as the standard defect form for detection technology verification and scientific research, and prefabrication and quantitative measurement of the defect are facilitated. By changing the shape of the defect, the manufactured defect can be closer to the actual shape on site, and simulation and comparison of the actual defect are more convenient.

Description

technical field [0001] The invention belongs to the field of non-destructive testing simulation test block preparation, in particular to a production method of polyethylene pipe hot-melt welding joint defect simulation test block. Background technique [0002] With the rapid development of economy and society, non-metallic pipelines are more and more widely used in oil and gas fields. In recent years, the statistics of surface engineering construction in various oil and gas fields show that the length of newly built pipelines exceeds 10,000 km each year, of which non-metallic pipelines account for 10% to 30%. In addition, non-metallic pipes are increasingly used in environmental protection projects, water supply projects, and urban gas projects. The safety of non-metallic pipelines has attracted more and more attention. The detection and evaluation of non-metallic pipelines will have great market space and development prospects in the future. Among many non-metallic pipe p...

AI Technical Summary

Problems solved by technology

[0003] At present, there are many research results and technical means for polyethylene pipeline routing detection and buried depth detection, but for the non-destructive testing technology after excavation, due to the lack of systematic research, there is no mature non-destructive testing means and methods for non-metallic pipelines at present. Standard specifications, which make the detection of non-metallic pipeline defects a difficult problem, urgently need to fill in the gaps

The preparation of non-destructive testing simulation test blocks for polyethylene pipe weld defects has become an important part of non-destructive testing technology. At present, no mature technology has been reported. The reason is that the materials of polyethylene pipes and metal pipes are very different. The production, connection, and transportation environment are very different from metal pipes, and the main defect forms and formation mechanisms are also different. For example, the common crack defects in metal pipes hardly exist in polyethylene pipes, and the welding of polyethylene pipes The method directly adopts thermal fusion or electric fusion, and does not require materials such as welding wire, so the method for preparing defects in metal pipelines is not suitable for non-metallic pipelines

Images