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Pipeline welding seam defect treatment method

A defect treatment and welding method technology, which is applied to welding equipment, arc welding equipment, workpiece edge parts, etc., can solve problems such as unsuitable welding and repairing of high-pressure pipelines, and achieve the effect of reducing process control requirements and reducing production costs

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

AI Technical Summary

Problems solved by technology

[0009] The invention proposes a method for treating weld defects of high-pressure pipelines to solve the problem that welding repairs are not suitable for weld defects in existing high-pressure pipelines

Method used

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  • Pipeline welding seam defect treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] The high-pressure mud pipeline used by an ultra-deepwater semi-submersible drilling platform is made of ASTM A519Gr.4130 material, and the supply status is usually quenched and tempered. The chemical composition range and mechanical performance requirements specified in the ASTM specification 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 ...

Embodiment 2

[0090] Pipe material, welding material, welding and heat treatment for the first time are the same as in Example 1

[0091] Figure 6 It is the schematic diagram of the welding repair groove of the embodiment of the present invention 2, as Figure 6 As shown, after the welding of the 141.3mm×31.75mm pipe is completed, it is found that the root is poorly formed, and the depth has exceeded the standard requirement by about 15mm. After removing the defect, the groove root gap a3 is 1-4mm, the root blunt edge a4 is 0-1mm, the groove angle α is 50°, and surfacing welding is performed on the original welding layer 10 on the weld side, and then The surfacing layer 20 is ground off by about 2mm, and ensure that the groove meets the specified requirements after assembly:

[0092] The parameters during surfacing welding are shown in Table 6:

[0093] Table 6 surfacing welding parameters

[0094]

[0095] The main welding parameters during welding and heat treatment are shown in T...

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Abstract

The invention provides a pipeline welding seam defect treatment method. The method includes the steps: firstly, performing non-destructive inspection for welding seams; secondly, determining the form of formed grooves according to that defects are positioned inside the welding seams, on outer surfaces of the welding seams or at the roots of the welding seams; thirdly, determining a welding method according to the form of the formed grooves and welding the welding seams; and fourthly, performing post-weld heat treatment for welded joints after welding. By the method, welding seam defects on materials can be directly repaired by welding, 100% of one-step welding qualified rate is not pursued necessarily, process control requirements are lowered, defect inspection before heat treatment can be omitted, pipe replacement is avoided after the defects are caused, and accordingly production cost is reduced greatly.

Description

technical field [0001] The invention relates to a weld defect repair process for high-strength / ultra-high-strength steel pipes, in particular to an overall weld defect repair scheme for low-alloy high-pressure pipelines on newly built 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. Among them, Ultra-Depth Water (UDW for short) and Ultra-Depth Drilling...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/00B23K9/16B23K9/04B23K33/00
Inventor 时群超郝学军肖明颖范振红曾清波
Owner LONGKOU CIMC RAFFLES OFFSHORE