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Multiple-wire submerged-arc welding technology for guaranteeing subsea pipeline steel pipe connector comprehensive performance

A multi-wire submerged arc welding technology with comprehensive performance, which is applied in the field of pipeline steel welding, can solve the problems of unsatisfactory impact energy and joint hardness of weld metal and fusion line, and achieve good hydrogen-induced cracking performance, good low-temperature toughness, high The effect of tensile strength

Active Publication Date: 2013-12-11
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a multi-wire submerged arc welding process that guarantees the comprehensive performance of seabed pipeline steel pipe joints, and solves the problem that the weld metal and fusion line impact energy and joint hardness cannot meet the requirements of engineering technology in the pipe making process of 28.8mmX65MS pipeline steel Requirements; and economical, simple, easy to implement, conducive to promotion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) X65MS submarine pipeline steel with yield strength of 450-610MPa, tensile strength ≥ 530MPa, impact energy ≥ 100J at -30°C produced by TMCP process, steel plate thickness 14.3-28.8mm, steel pipe diameter Φ813mm;

[0015] The matching of welding wire is: the selection of welding wire for inner welding seam is H08C welding wire for wire 1 and wire 2, the diameter of welding wire is Φ4.0mm, the diameter of welding wire for third wire is H08E, and the diameter of welding wire is Φ3.2mm; all welding wires for outer welding seam are H08C welding wire, The diameter of 1 wire and 2 wire welding wire is Φ4.0mm, and the diameter of 3 wire welding wire is Φ3.2mm;

[0016] H08C welding wire matches the mechanical properties of SJ101G flux deposited metal: tensile strength 620MPa, yield strength 575MPa, elongation 27%, -20°C impact energy 111J, -40°C impact energy 64J;

[0017] (2) A double-sided symmetrical X-shaped bevel is opened at the joint, and the bevel angle is as small ...

Embodiment 2

[0021] (1) X65MS submarine pipeline steel with yield strength of 450-610MPa, tensile strength ≥ 530MPa, impact energy ≥ 100J at -30°C produced by TMCP process, steel plate thickness 14.3-28.8mm, steel pipe diameter Φ813mm;

[0022] The matching of welding wire is: the selection of welding wire for inner welding seam is H08C welding wire for wire 1 and wire 2, the diameter of welding wire is Φ4.0mm, the diameter of welding wire for third wire is H08E, and the diameter of welding wire is Φ3.2mm; all welding wires for outer welding seam are H08C welding wire, The diameter of 1 wire and 2 wire welding wire is Φ4.0mm, and the diameter of 3 wire welding wire is Φ3.2mm;

[0023] H08C welding wire matches the mechanical properties of SJ101G flux deposited metal: tensile strength 620MPa, yield strength 575MPa, elongation 27%, -20°C impact energy 111J, -40°C impact energy 64J;

[0024] (2) A double-sided symmetrical X-shaped bevel is opened at the joint, and the bevel angle is as small ...

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Abstract

The invention discloses a multiple-wire submerged-arc welding technology for guaranteeing subsea pipeline steel pipe connector comprehensive performance, and belongs to the technical field of pipeline steel welding. The multiple-wire submerged-arc welding technology solves the problem that impact energy of 28.8mmX65MS pipeline steel pipe weld metal and fusion lines and connector rigidity cannot meet the engineering requirements. Welding of an inner weld joint and welding of an outer weld joint are completed by the adoption of automatic three-wire submerged-arc welding, a first wire of the inner weld joint, a second wire of the inner weld joint and a weld wire of the outer weld joint are H08C weld wires, and a third wire of the inner weld joint is an H08E weld wire; the diameter of the first wire and the diameter of the second wire are respectively 4.0mm, and the diameter of the third wire is 3.2mm. The bevel angle of a connector should be as small as possible, the base metal fusion ratio is improved, the comprehensive performance of the connector is guaranteed through weld joint attenuation by base metal, the bevel angle is chosen to be 60 degrees to 70 degrees, and a truncated edge of 8-10mm is reserved. According to the multiple-wire submerged-arc welding technology, through optimization of the bevel angle and different matching of weld materials, the harsh requirements for the comprehensive performance of the steel pipe welding connector of a subsea pipeline with the ratio of thickness to radial dimension being 0.0354 are met, and the technology is economical, simple and convenient to apply, easy to implement and beneficial to popularization.

Description

technical field [0001] The invention belongs to the technical field of pipeline steel welding, and in particular provides a multi-wire submerged arc welding process for ensuring the comprehensive performance of submarine pipeline steel pipe joints, which is suitable for welding 28.8mmX65MS submarine pipeline steel. Background technique [0002] Pipeline transportation is the most economical and reasonable way to transport oil and natural gas over long distances. Submarine line pipe, as a kind of pipeline steel pipe, is mainly used for submarine pipelines serving in acidic environments and onshore surface gathering and transportation pipelines. Due to the particularity of the working environment, it is required to have high strength, high low temperature crack arrest toughness and good weldability. For pipeline steel pipes in special areas, it is also required to have the ability to resist H2S corrosion and large strain. The requirements for the mechanical properties of ste...

Claims

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Application Information

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IPC IPC(8): B23K9/18B23K9/173B23K33/00
Inventor 陈延清郭占山张熹刘宏齐建鞠建斌张飞虎牟淑坤董现春张楠
Owner SHOUGANG CORPORATION
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