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Carbon-fibre composite material for repairing and reinforcing weld seam defect and its method

A carbon fiber sheet and reinforcement technology, which is applied in the direction of adhesive type, epoxy resin glue, adhesive, etc., can solve the problem that there is no good technical solution for the reinforcement of girth welds and spiral weld defects.

Inactive Publication Date: 2006-11-01
BEIJING SAFETECH PIPELINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] So far, there is no good technical solution for the reinforcement of girth weld and spiral weld defects

Method used

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  • Carbon-fibre composite material for repairing and reinforcing weld seam defect and its method
  • Carbon-fibre composite material for repairing and reinforcing weld seam defect and its method
  • Carbon-fibre composite material for repairing and reinforcing weld seam defect and its method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0099] Embodiment 1: Reinforcing effect experiment

[0100] In order to verify the reinforcement effect of carbon fiber composites on welds containing crack defects, we designed the following experiments to test the reinforcement effect. The samples used in the experiment are as Figure 4 As shown, the sample is assembled from two parts (A) and (B), and the two parts have the same length l and diameter Ф of the test section; the diameter Ф of the butt joint of the sample is 40mm, and the length l 1 is 30mm; the diameter  of the sample holding end is 20mm. The sample is made of 45# steel. See the physical appearance of the sample Figure 5 . The extreme case of a fully split circumferential weld is simulated with this specimen. A total of three samples were processed to compare and verify the effects of different winding methods and whether to apply primer on the shear strength of carbon fiber composite materials and steel. The reinforcing material layers of the three sa...

Embodiment 2

[0118] Example 2: Effect of material surface roughness on shear force between reinforcing material and pipe body

[0119] Using materials and methods similar to those in Example 1, experiments were carried out to change the diameter, winding length and roughness of the sample rod.

[0120] The samples used in the experiment were Figure 4 As shown, the sample is assembled from two parts (A) and (B). The two parts have the same length l of the experimental section, which is 100mm, and the diameter of the experimental section is 50mm; the diameter of the butt joint of the sample is 20mm. length l 1 is 30mm; the diameter  of the sample holding end is 20mm. The sample is made of 45# steel; the layup sequence of both samples is 90 / 0 / 90 / 0 / 90 / 0 / 90.

[0121] Experiments and testing methods are as described in Example 1. The experimental results are as follows:

[0122] sample

Numbering

Reinforcement wrapped around

winding length(mm)

roughness

()...

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Abstract

A method for repairing and reinforcing the defect on the welded seam of pipeline by use of composite carbon fiber material features several layers of wet carbon fiber sheet are tightly wound around and adhered onto said weld seam in various directions. It is possible to use the repairing resin and perform anticorrosion treatment on the external surface of carbon fiber layer.

Description

field of invention [0001] The present invention relates to a technique for repairing and reinforcing weld defects with resin-based carbon fiber composite materials, and more particularly, the present invention relates to weld defects for weld defects, such as pipeline weld defects, including girth welds and spiral welds A method for repairing and strengthening defects, and the application of the materials and methods in repairing and strengthening various weld defects. Background technique [0002] Oil and gas pipeline transportation is one of the five major transportation industries. At present, my country's long-distance oil and gas pipelines alone have reached more than 30,000 kilometers. During the installation and service of such a long-distance pipeline, welding defects may appear in many welds, such as incomplete penetration or cracks in welded seams, and the welded seams include girth welds and spiral welds. If girth welds and spiral welds have defects of incomplete...

Claims

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Application Information

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IPC IPC(8): B23P6/00B29C73/00C09J163/00
Inventor 王修云郑岩王金友陈迎锋
Owner BEIJING SAFETECH PIPELINE
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