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Semiautomatic argon tungsten-arc welding technological process of bimetal compounding sea pipe

A technology of argon tungsten arc and welding technology, which is applied in the direction of metal processing equipment, welding equipment, arc welding equipment, etc., can solve the problems of unsuitable welding of composite pipelines, waste of manpower, material and financial resources, and influence of pipeline welding speed, etc., to save auxiliary equipment The effect of reducing working time, reducing labor intensity and improving welding efficiency

Inactive Publication Date: 2012-07-04
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this semi-automatic welding process needs to switch welding methods during root welding, filling and capping, which wastes a lot of time and affects the welding speed of the pipeline, especially not suitable for welding composite pipelines
[0010] In short, if the conventional argon arc welding technology is used in the laying and welding of the bimetal composite pipe and the prefabrication of the riser, it will take a lot of time, waste a lot of manpower, material and financial resources, and the repair rate is high

Method used

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  • Semiautomatic argon tungsten-arc welding technological process of bimetal compounding sea pipe
  • Semiautomatic argon tungsten-arc welding technological process of bimetal compounding sea pipe
  • Semiautomatic argon tungsten-arc welding technological process of bimetal compounding sea pipe

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The specification of bimetallic composite sea pipe is Φ219.1×14.3+3mm, in which the base material is PSL2X65SMLS material according to API standard, and the inner lining is 316L stainless steel material. The main steps of the process are as follows:

[0049] 1. Preparation process before welding:

[0050] 4) Groove production: prepare a single-sided "J"-shaped groove by machining, with a slope angle of 8°, a blunt edge thickness of 1.7mm, and a transition arc radius of 3mm.

[0051] 5) Butt joint assembly groove: the clearance is required to be 0mm, and check to confirm that there are no defects in the welded parts and edges.

[0052] 6) Selected welding materials: ARCOS 625 and Atlantic 316L.

[0053] Welding consumables are selected based on the principle of high matching. The yield strength of welding consumables is 80-200Mpa higher than that of the base metal to ensure that the mechanical properties and corrosion resistance of the welded joints meet the requiremen...

Embodiment 2

[0072] The specification of bimetallic composite sea pipe is Φ219.1×14.3+3mm, in which the base material is PSL2X65SMLS material according to API standard, and the inner lining is 316L stainless steel material. The main steps of the process are as follows:

[0073] 1. Preparation process before welding:

[0074] 1) Groove production: A single-sided "J"-shaped groove is prepared by machining, with a slope angle of 9°, a blunt edge thickness of 1.9mm, and a transition arc radius of 3mm.

[0075] 2) Butt joint assembly groove: the clearance is required to be 0mm, and check to confirm that there are no defects in the welded parts and edges.

[0076] 3) Selected welding materials: ARCOS 625 is used as filler welding and cover welding materials, Atlantic 316L is used as bottom welding and hot pass welding materials.

[0077] 2. Bottom welding process:

[0078] The bottom welding process adopts single-layer single-pass welding.

[0079] The semi-automatic tungsten argon shielded ...

Embodiment 3

[0095] The specification of bimetallic composite sea pipe is Φ219.1×14.3+3mm, in which the base material is PSL2X65SMLS material according to API standard, and the inner lining is 316L stainless steel material. The main steps of the process are as follows:

[0096] 1. Preparation process before welding:

[0097] 1) Groove production: Prepare a single-sided "J"-shaped groove by machining, with a slope angle of 7°, a blunt edge thickness of 1.8mm, and a transition arc radius of 3mm.

[0098] 2) Butt joint assembly groove: the clearance is required to be 0mm, and check to confirm that there are no defects in the welded parts and edges.

[0099] 3) Selected welding materials: ARCOS 625 is used as filler welding and cover welding materials, Atlantic 316L is used as bottom welding and hot pass welding materials.

[0100] 2. Bottom welding process:

[0101] The bottom welding process adopts single-layer single-pass welding.

[0102] The semi-automatic tungsten argon shielded weld...

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Abstract

The invention relates to a semiautomatic argon tungsten-arc welding technological process of a bimetal compounding sea pipe, a labour hand-held semi-automatic welding gun welding is adopted, a wire feeder continuously feeds wires, and argon gas is utilized as protective gas. The technological process comprises the following operation steps of: firstly, procedure preparation before welding: manufacturing a groove, picking up fitting the groove, and selecting a welding material; secondly, backing welding process: adopting single layer one-pass welding, wherein two welders respectively stand thetwo sides of a welding seam so as to finish the backing welding; thirdly, hot-runner welding procedure: adopting single layer two-way welding and two-person welding; fourthly, filling welding procedure: adopting five-layer two-way welding and the two-person welding, and dismantling the protective gas after welding four layers; and fifthly, a cover surface welding process: adopting the single layer one-pass welding. The technological process provided by the invention has the advantages of high welding quality, small labour intensity, low construction cost, and high production efficiency; and the technological process is suitable for a compounding submarine pipeline and welding procedure of a subsidiary vertical pipe of the compounding submarine pipeline, and is suitable for the welding of a deep water composite material pressure container and deep water pipe manifold nickel base alloy and the like.

Description

technical field [0001] The invention relates to an argon arc welding method, in particular to a semi-automatic tungsten argon arc welding process for bimetal composite sea pipes, belonging to the field of welding technology. Background technique [0002] In 2011, my country's first bimetallic composite pipeline for offshore oil and gas fields - the Yacheng 13-4 gas field development project, the laying and installation of submarine pipelines and riser umbilical cables officially started, which marks the further development of pipelines for offshore oil and gas fields in my country. It marks a major breakthrough in the welding technology of bimetallic composite pipes in China, and is of great significance to the development of oil fields with high corrosive medium content. [0003] The natural gas transported by the sea pipeline of Yacheng 13-4 gas field contains more corrosive media, which is highly corrosive to ordinary carbon steel sea pipes. In order to prolong the service...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/167B23K9/12B23K9/23
Inventor 周声结周东荣张立井元彬彭忠卫王文龙童仁平陈大江
Owner CHINA NAT OFFSHORE OIL CORP
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