Pipeline welding method

A welding method and pipeline technology, which is applied in welding equipment, welding/welding/cutting items, pipeline systems, etc., can solve problems such as difficult quality assurance and stability, and achieve the effect of suppressing the tendency of cracks

Active Publication Date: 2013-01-02
LONGKOU CIMC RAFFLES OFFSHORE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The invention proposes a pipeline welding method to solve the defect that the

Method used

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Embodiment 1

[0071] On an ultra-deepwater semi-submersible drilling platform, the high-pressure mud pipeline used is: ASTM A519Gr.4130 material, and the supply state is usually quenched and tempered. The chemical composition range and mechanical performance requirements specified in ASTM specifications are shown in Table 1 and Table 2 .

[0072] Table 1 Chemical composition range of ASTM A519Gr.4130 (%)

[0073] steel grade

C

mn

Cr

Mo

P

S

Si

ASTM A519Gr.4130

0.28-0.33

0.40-0.60

0.80-1.10

0.15-0.25

≤0.04

≤0.04

0.15-0.35

[0074] Table 2 Typical mechanical properties of ASTM A519Gr.4130

[0075] steel grade

state

Tensile (MPa)

Yield (MPa)

Elongation(%)

ASTM A519Gr.4130

Conditioning

724

586

20%

[0076] According to the requirements of offshore platform construction specifications, additional impact toughness requirements are req...

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Abstract

The invention discloses a pipeline welding method which includes the steps: firstly, processing and assembling a weld joint to form a correct welding joint form; secondly, selecting a GTAW (gas tungsten arc welding) and SMAW (shielded metal arc welding) combined welding method for welding; and thirdly, performing post-weld heat treatment for the finished weld joint. The root is made of welding materials fine in anti-cracking performance, and the GTAW method is selected to effectively inhibit the cracking tendency of the root. The strength of the weld joint is guaranteed by the combined strength of two kinds of welding materials, and the overall strength of the joint is higher than the strength of a base material.

Description

technical field [0001] The invention relates to a welding process for high-strength / ultra-high-strength steel pipes, in particular to an overall welding process scheme for low-alloy high-pressure pipelines on deep-water / ultra-deep-water ocean drilling rigs. Background technique [0002] At present, the oil industry is investing more and more in offshore oil and gas, especially the importance and strategic position of oil exploration and development in deep sea and cold sea areas has attracted more and more attention from the industry. Drilling equipment is the core device of offshore drilling platforms. For deepwater and ultra-deepwater offshore drilling platforms, due to the requirements of operating water depth and drilling depth, high-pressure pipelines related to mud / cement / throttling / killing / well control systems must use super Only high-strength steel pipes can meet the requirements of use. [0003] Among them, Ultra-Depth Water (UDW for short) and Ultra-Depth Drilling...

Claims

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Application Information

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IPC IPC(8): B23K9/02B23K9/173B23K9/235B23K33/00B23K101/10B23K103/04
Inventor 时群超郝学军肖明颖范振红陈璐
Owner LONGKOU CIMC RAFFLES OFFSHORE
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