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Composite material repairing and strengthening method for boss fillet weld

A composite material and composite material fiber technology, which is applied in the field of composite material repair and reinforcement where the boss welding forms a cross weld with the main pipe weld, and can solve problems such as boss fillet weld welding and pipeline girth weld welding

Active Publication Date: 2016-12-21
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
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  • Claims
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Problems solved by technology

On the other hand, replacing the pipeline will also cause problems such as new girth weld welding and boss fillet weld welding.

Method used

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  • Composite material repairing and strengthening method for boss fillet weld
  • Composite material repairing and strengthening method for boss fillet weld

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Embodiment Construction

[0028] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0029] The design content of the present invention is mainly to provide a method for repairing and reinforcing composite materials of boss fillet welds, comprising the following steps:

[0030] 1) First, use a cleaning agent to clean the surface of the main pipe section, branch pipe section and fillet welded steel pipe within the width of the reinforcement to be repaired, and dry them sufficiently.

[0031] 2) Spread the prepared epoxy resin dipping glue evenly on the surface of the reinforced pipe section to be repaired.

[0032] 3) According to the minimum repair width of reinforcement, the number of reinforcement layers and the groove requirements of the boundary, the fiber cloth width is gradually reduced and the thickness of the reinforcement layer is gradually increased in the repair an...

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Abstract

The invention discloses a composite material repairing and strengthening method for a boss fillet weld. The composite material repairing and strengthening method comprises the following steps of: cleaning a to-be-repaired-and-strengthened steel tube surface within a width range, and sufficiently drying; coating the surface of a to-be-repaired-and-strengthened tube section with prepared epoxy resin sticky dipping glue; (3) according to strengthening width, the number of strengthening layers and groove requirements of a boundary, sequentially winding cut composite material fiber cloth and interlayer epoxy resin sticky dipping glue around steel tubes crosswise and spirally, wherein the composite material fiber cloth mutually overlaps by 50% during spiral winding; enabling the groove of the boundary to be a slope with an angle being 15+ / -5 degrees; and curing and naturally drying in air, thereby completing a composite material repairing and strengthening process for the boss fillet weld. The composite material repairing and strengthening method avoids safety accidents such as leakage in an operation process, especially avoids a phenomenon that cracks of a cross weld extend and fracture along a straight weld area of a performance main pipeline, and avoids occurrence of severe disasters and loss.

Description

technical field [0001] The invention relates to a method for repairing and strengthening composite material of fillet welds of bosses, in particular to a repairing and strengthening method of composite materials for forming intersecting welds with welds of main pipes after bosses are welded. Background technique [0002] Stations and valve rooms are essential components in the storage and transportation of oil and gas. In order to meet the installation needs of valves, instruments and flanges, it is often encountered in the design of stations and valve chambers to open holes and weld bosses on the main pipe. ERW welded pipe is electric resistance welded steel pipe without filler metal. It is widely used in many key station projects because of its uniform wall thickness, easy anti-corrosion coating, high dimensional accuracy, and no internal welding bumps. According to the standards SY 0402-2002 "Code for Construction and Acceptance of Process Piping Engineering in Petroleu...

Claims

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Application Information

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IPC IPC(8): B23K37/00B23P6/00
CPCB23K37/00B23P6/00
Inventor 胡美娟李鹤罗金恒邵春明池强杨坤张伟卫
Owner BC P INC CHINA NAT PETROLEUM CORP
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