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Winter welding construction method of long-distance transport pipe line

A construction method and pipeline technology, applied in welding equipment, manufacturing tools, arc welding equipment, etc., can solve problems such as restricting pipeline welding construction, and achieve the effects of low welding cold crack sensitivity index, low carbon equivalent, and high low temperature toughness.

Inactive Publication Date: 2010-12-29
CHINA MCC 2 GRP CO LTD
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

This greatly restricts the welding construction of the pipeline.

Method used

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Examples

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Effect test

Embodiment

[0012] The welding construction method of the present invention is applied to the slurry pipeline welding construction in Baotou Steel's ore slurry pipeline engineering, and the weldability test is carried out before the welding construction to obtain the welding process evaluation and regulations to guide the welding construction. Firstly, remove the rust within 50mm of the nozzle to expose the metallic luster; grind the groove of the nozzle, use an excavator to grade the pipeline, and use a pneumatic internal counterpart to assemble the pipeline, and then weld the Set up a heat preservation shed around, and install 4 Yuba and 2 iodine tungsten lamps in the heat preservation shed to increase the ambient temperature and reduce the humidity, so that the temperature in the heat preservation shed is higher than 5°C and the humidity is less than 90% RH; The pipeline is preheated, and the preheating method adopts a pipeline crawler heater. The heating temperature range is 80-140°C. ...

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Abstract

The invention relates to a winter welding construction method of a long-distance transport pipeline, which is characterized by comprising the following steps of: pairing pipes, setting up a heat-preservation shed around the orifices of the pipes to be welded before welding to preserve heat and dehumidify, and carrying out all-position welding on the pipes by using a cellulose manual underhand welding method and a semiautomatic underhand welding method in a welding process, wherein the manual welding is adopted for root welding and the semiautomatic welding is adopted for other welding; heating a welded junction at 100-150 DEG C by using an electric heater after finishing welding and keeping a constant temperature for half an hour, then immediately wrapping the completed welded junction and covering with felt, binding by using a rubber belt and preserving heat for above 24 hours. The winter welding construction method of the long-distance transport pipeline has the advantages of overcoming the defect that the welding construction of the long-distance transport pipeline cannot be carried out in winter due to cold climate in northern areas and ensuring the normal welding construction of the long-distance transport pipeline in winter, has high welding quality and is suitable for welding high-intensity pipelines mainly made from X65 and the like. The winter welding construction method of the long-distance transport pipeline is characterized by low carbon equivalent, low sensitivity index of welding cold crack and high low-temperature toughness and is mainly used for the long-distance transport pipelines of petroleum, natural gas, slurry and the like.

Description

technical field [0001] The invention relates to a winter welding construction method of a long-distance pipeline, belonging to the technical field of welding. Background technique [0002] At present, the welding construction of most pipelines, including the construction of long-distance pipelines, is generally welded under normal temperature conditions where the temperature is allowed, that is, the temperature must not be lower than -5 degrees Celsius. This restricts the welding construction of the pipeline to a great extent. It is impossible to carry out the welding construction of pipelines for a long time in winter, especially in the northern region, which is more obviously affected by weather factors. Contents of the invention [0003] The purpose of the present invention is to provide a high-strength pipeline suitable for welding whose main material is X65. It is characterized by low carbon equivalent, low welding cold crack sensitivity index, and high low-temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/00
Inventor 孙权仁王蒙强朱宇窦明月梁际云
Owner CHINA MCC 2 GRP CO LTD
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