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Welding process of natural gas long-distance pipeline

A long-distance pipeline and welding process technology, applied in welding equipment, welding equipment, auxiliary welding equipment, etc., can solve problems such as poor interface conditions, difficult control of weld gaps, and wind speed affecting welding quality, and achieve the goal of reducing welding quality Influence and optimize the effect of interface groups on conditions and improve accuracy

Inactive Publication Date: 2019-11-12
芜湖中燃城市燃气发展有限公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The welding process of long-distance natural gas pipelines belongs to on-site construction, and the construction topography and topography during on-site construction have a crucial impact on the welding quality. Since long-distance pipelines will encounter various topography and topography, the differences will lead to Diversification, poor interface conditions, and difficult to control the weld gap; in addition, the wind speed during the welding process is also a factor affecting the welding quality

Method used

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  • Welding process of natural gas long-distance pipeline
  • Welding process of natural gas long-distance pipeline
  • Welding process of natural gas long-distance pipeline

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Effect test

Embodiment 1

[0038] The specific welding process is as follows:

[0039] 1. Open the groove 3 at the crack of the long-distance pipeline 1, and clean out all the dirt on the inside of the groove and within 25mm on both sides of the groove, and polish the spiral weld within 10mm on both sides of the groove 3 to be flush with the base metal , and a gentle transition at an elevation angle of 30°, the blunt edge of the groove 3 is between 1.5 and 2.0mm;

[0040] 2. Disassemble the long-distance pipeline 1 from the connecting pipe 2 at both ends, and place the fixed base 20 on the bottom of the long-distance pipeline 1, and use the left positioning ring 21 and the right positioning ring 22 to fix the fixing frame 4 on both sides of the groove 3 , and use the fixed pin 26 to precisely position the left positioning ring 21 and the right positioning ring 22;

[0041] 3. Carry out the welding process by adopting the manual downward welding method.

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Abstract

The invention discloses a welding process of a natural gas long-distance pipeline. The welding process involves long-distance pipelines and a communicating pipe; the communicating pipe is fixedly arranged between two adjacent long-distance pipelines in a sealing manner; a groove is formed in the long-distance pipelines; fixing frames are arranged on the two sides of the groove; each fixing frame comprises a fixing base, a left positioning ring and a right positioning ring; the left positioning ring and the right positioning ring are correspondingly and fixedly arranged on the fixing base through hinges; and the left positioning ring and the right positioning ring are positioned through fixing pins. The fixing frames are additionally arranged on the long-distance pipeline so as to achieve the purpose of fixing the long-distance pipeline, the precision of welding joints of a connecting pipe is improved, and the condition of an interface group is optimized; and in addition, the fixing frames can play a certain wind shielding role, so that the influence of the wind speed on the welding quality can be reduced as much as possible.

Description

technical field [0001] The invention relates to a long-distance pipeline welding process, in particular to a long-distance natural gas pipeline welding process, which belongs to the application field of natural gas equipment. Background technique [0002] The welding process of long-distance natural gas pipelines belongs to on-site construction, and the construction topography and topography during on-site construction have a crucial impact on the welding quality. Since long-distance pipelines will encounter various topography and topography, the differences will lead to Diversification, poor interface conditions, and difficult control of the weld gap; in addition, the wind speed during the welding process is also a factor that affects the welding quality. Contents of the invention [0003] The object of the present invention is to provide a welding process for long-distance natural gas pipelines in order to solve the above problems. [0004] The present invention achieve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/235B23K37/053
CPCB23K9/235B23K37/053
Inventor 曹亮
Owner 芜湖中燃城市燃气发展有限公司
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