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Flux-cored welding wire for oil and gas transmission pipeline and preparation method thereof

A technology for conveying pipes and flux-cored wires, applied in welding equipment, manufacturing tools, welding media, etc., can solve the problems of low-temperature toughness of welded joints, unstable low-temperature impact value, unreasonable composition design, etc., to reduce weld structure Impurities, facilitate slag forming and covering performance, and improve stability

Active Publication Date: 2021-05-28
GUILIN UNIV OF AEROSPACE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the flux-cored welding wires for oil and gas pipelines are mainly imported from abroad. The domestically produced flux-cored welding wires in my country still have unreasonable composition design, and the welded joints still need to be improved in terms of low-temperature toughness, low-temperature impact value instability and strength.

Method used

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  • Flux-cored welding wire for oil and gas transmission pipeline and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Flux-cored welding wire for oil and gas transmission pipelines is composed of a flux core and a low-carbon steel strip wrapped around the flux core. The flux core accounts for 12% of the total weight of the flux-cored welding wire for oil and gas transmission pipelines. Redstone powder 5%, nickel powder 3%, zirconium powder 3%, white corundum powder 1%, yttrium trioxide 1%, manganese silicon alloy powder 2%, chromium ferroalloy powder 1%, magnesium oxide powder 1%, molybdenum ferroalloy powder 0.5%, tungsten carbide powder 0.5%, rare earth fluoride 0.5%, cerium oxide 0.1%, and the balance is iron powder. The sum of the mass percentages of the above components is 100%, and the silicon-manganese ratio in the manganese-silicon alloy powder is 30%. : 70; the chromium content in the ferrochrome alloy powder is 30wt%; the molybdenum content in the ferromolybdenum alloy powder is 50wt%.

[0026] The preparation method of flux-cored welding wire for oil and gas pipelines is as ...

Embodiment 2

[0030] Flux-cored welding wire for oil and gas transmission pipelines is composed of a flux core and a low-carbon steel strip wrapped around the flux core. The flux core accounts for 15% of the total weight of the flux-cored welding wire for oil and gas transmission pipelines. Redstone powder 6%, nickel powder 4%, zirconium powder 4%, white corundum powder 2%, yttrium trioxide 2%, manganese silicon alloy powder 3%, chromium ferroalloy powder 3%, magnesium oxide powder 2%, molybdenum ferroalloy powder 1%, tungsten carbide powder 1%, rare earth fluoride 1%, cerium oxide 0.2%, and iron powder as the balance, the sum of the above components by mass percentage is 100%, and the silicon-manganese ratio in the manganese-silicon alloy powder is 30% : 70; the chromium content in the ferrochromium alloy powder is 35wt%; the molybdenum content in the ferromolybdenum alloy powder is 55wt%.

[0031] The preparation method of flux-cored welding wire for oil and gas pipelines is as follows: ...

Embodiment 3

[0035] Flux-cored welding wire for oil and gas pipelines consists of a flux core and a low-carbon steel strip wrapped around the core. The flux core accounts for 20% of the total weight of the flux-cored wire for oil and gas pipelines. The flux core contains the following components in mass percentage: Redstone powder 10%, nickel powder 6%, zirconium powder 6%, white corundum powder 4%, yttrium trioxide 3%, manganese silicon alloy powder 5%, chromium ferroalloy powder 5%, magnesium oxide powder 4%, molybdenum ferroalloy powder 2%, tungsten carbide powder 2%, rare earth fluoride 2%, cerium oxide 0.5%, and the balance is iron powder. The sum of the mass percentages of the above components is 100%, and the silicon-manganese ratio in the manganese-silicon alloy powder is 30%. : 70; the chromium content in the ferrochromium alloy powder is 35wt%; the molybdenum content in the ferromolybdenum alloy powder is 55wt%.

[0036] The preparation method of flux-cored welding wire for oil a...

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Abstract

The invention relates to a drug-cored welding wire for oil and gas transportation pipelines and a preparation method thereof, which is characterized in that it consists of a drug core and a low-carbon steel strip wrapped around the drug core, and the drug core accounts for 12% of the total weight of the drug-cored welding wire for oil and gas transportation pipelines. ‑20%, the drug core contains the following components in mass percentage: rutile powder 5‑10%, nickel powder 3‑6%, zirconium powder 3‑6%, white corundum powder 1‑4%, diyttrium trioxide 1‑3%, manganese silicon alloy powder 2‑5%, chromium iron alloy powder 1‑5%, magnesium oxide powder 1‑4%, molybdenum iron alloy powder 0.5‑2%, tungsten carbide powder 0.5‑2%, rare earth fluoride 0.5% -2%, 0.1-0.5% of cerium oxide, and iron powder as the balance, the sum of the mass percentages of the above components is 100%. The flux-cored welding wire for the oil and gas transportation pipeline of the present invention has the advantages of beautiful weld shape, easy slag removal, small spatter, stable arc, and excellent low-temperature toughness, low-temperature impact resistance and strength of weld structure alloy.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a flux-cored welding wire for oil and gas transmission pipelines and a preparation method thereof. Background technique [0002] With the rapid development of social economy, there are more and more long-distance oil and natural gas pipeline construction projects in my country, including the first line of West-East Gas Pipeline, Sichuan-East Gas Pipeline, Second West-East Gas Pipeline, and Third West-East Gas Pipeline. The diameter of the pipeline in the project is getting bigger and bigger, and the grade of steel is getting higher and higher. In order to meet the growing demand for natural gas, natural gas pipelines are developing towards long-distance, high-pressure, and large-caliber directions, and the strength level of steel used for pipelines is also increasing. In addition to X70 and X80 steel, X90 and other higher-level steel The application prospect of pipeline steel in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K35/12B23K35/40
CPCB23K35/0266B23K35/3053B23K35/406
Inventor 刘运强叶东郑利华
Owner GUILIN UNIV OF AEROSPACE TECH
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