Cladding method for inner wall of pipeline

A pipeline and cladding technology, applied in the coating, metal material coating process, etc., can solve the problems of natural gas and crude oil leakage, unsatisfactory effect, economic loss, etc., achieve high yield, avoid sharp temperature rise, improve quality effect

Active Publication Date: 2016-03-30
SHANDONG ENERGY HEAVY EQUIP GRP DAZU REMANUFACTURING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Once a corrosion accident occurs in the oil pipeline, natural gas and crude oil will leak, or burn and explode, which will not only cause serious economic losses, but also cause environmental pollution.
At present, coating anticorrosion and electrical protection are often used in China to improve the corrosion resistance of the inner wall of oil pipelines, but the results are not satisfactory.

Method used

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  • Cladding method for inner wall of pipeline
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A method for cladding the inner wall of a pipeline, comprising the following steps:

[0045] (1) Pretreat the inner wall of the pipeline 1 to be processed, remove burrs and rust on the inner wall surface, and expose the metallic luster;

[0046] (2) The pipeline 1 to be processed is fixed on the tooling, the laser head is placed inside the pipeline 1 to be processed, and the laser head feeds in the direction of the main axis of the pipeline 1 to be processed, and the laser head is provided with a smoke removal The device and powder feeding device can absorb the smoke generated during the cladding process in time;

[0047] (3) Adopt synchronous powder feeding mode, the laser head moves from one end of the pipeline to be processed 1 to the other end along the main axis direction of the pipeline to be processed 1, and completes a feed movement;

[0048] (4) The laser head resets along the main axis direction of the pipeline 1 to be processed, and performs the next feed mo...

Embodiment 2

[0060] The same part of this embodiment and Embodiment 1 will not be described again, the difference is:

[0061] The alloy powder includes the following formula components: C: 0.9-1.2 parts, W: 4.0-4.2 parts, Ni: 1.0-3.0 parts, Co: 60.8-66.6 parts, Fe: 0.3-1.0 parts, Cr: 26.1-28.5 parts Parts, Si: 1.1-1.3 parts.

[0062] The length of the pipeline 1 to be processed is 3m, the cross section of the pipeline 1 to be processed is a square, and the cladding method is as follows:

[0063] (1) During a feed movement of the laser head along the main axis direction of the pipeline to be processed 1, the laser head is clad from one end of the inner wall of the pipeline to be processed 1 to the other end to obtain the Nth cladding strip 2, Its unilateral thickness is 1.6mm;

[0064] (2) The laser head is reset along the main axis direction of the pipeline 1 to be processed, and cladding the side of the Nth cladding strip 2 from one end of the pipeline 1 to be processed to the other en...

Embodiment 3

[0071] The same part of this embodiment and Embodiment 1 will not be described again, the difference is:

[0072] The alloy powder includes the following formula components: C: 1.2 parts, W: 4.2 parts, Ni: 3.0 parts, Co: 66.6 parts, Fe: 1.0 parts, Cr: 28.5 parts, Si: 1.3 parts.

[0073] The length of the pipeline 1 to be processed is 2.5m, and the cross section of the pipeline 1 to be processed is a regular hexagon, and the cladding method is as follows:

[0074] (1) During a feed movement of the laser head along the main axis direction of the pipeline to be processed 1, the laser head is clad from one end of the inner wall of the pipeline to be processed 1 to the other end to obtain the Nth cladding strip 2, Its unilateral thickness is 2mm;

[0075] (2) The laser head is reset along the main axis direction of the pipeline 1 to be processed, and cladding the side of the Nth cladding strip 2 from one end of the pipeline 1 to be processed to the other end, forming the N+th 1 c...

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Abstract

The invention discloses a cladding method for the inner wall of a pipeline and belongs to the technical field of laser cladding methods. Alloy powder is cladded on the inner wall of the pipeline to be machined, and a cladding layer is obtained. By means of the cladding method, the corrosion resistance and abrasion resistance of the inner wall of the pipeline are effectively improved, the service life of the pipeline is prolonged, and the operability for conducting laser cladding on the inner wall of the pipeline is improved; effective metallurgical bonding is achieved between the alloy powder and the inner wall of the pipeline, so that the cladding layer is prompted to have good oxidization resistance, impact resistance and thermal fatigue resistance. The cladding method can meet requirements for the high technology and automation development of enterprises.

Description

technical field [0001] The invention relates to the technical field of laser cladding methods, in particular to a cladding method for the inner wall of a pipeline. Background technique [0002] As a carrier of gas, liquid or solid particles, pipelines are mainly used in water supply, drainage, heat supply, gas supply, long-distance transportation of oil and natural gas, agricultural irrigation, hydraulic engineering and various industrial devices. Pipeline traffic, support, slope, drainage and exhaust, compensation, heat preservation and heating, anticorrosion and cleaning, identification and painting, safety and other factors are important issues for both ground laying and underground laying. Corrosion is the most important issue for pipelines. The main cause of failure accidents. [0003] The environment of petroleum pipelines is extremely complex, and it is one of the pipelines that are extremely vulnerable to corrosion. Water, gas, hydrocarbons and other gas, liquid, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C19/07
CPCC22C19/07C23C24/106
Inventor 周峰杨庆东李圣文澹台凡亮杨帆宋其伟杜学芸陶常胜李阳
Owner SHANDONG ENERGY HEAVY EQUIP GRP DAZU REMANUFACTURING CO LTD
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