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Flux-cored wire for welding X90 pipeline steel and preparing method thereof

A technology of flux-cored welding wire and pipeline steel, applied in welding equipment, welding medium, welding/cutting medium/material, etc., can solve the problems of no flux-cored welding wire, difficult field operation, etc., and achieve good arc starting and arc stabilization performance. , The effect of good molten pool fluidity and uniform particle size

Inactive Publication Date: 2015-07-01
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, X90 is only used in a small range. There is no flux-cored wire that matches it in the market, and most of them are welded by submerged arc welding, which is difficult to carry out field work.

Method used

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  • Flux-cored wire for welding X90 pipeline steel and preparing method thereof
  • Flux-cored wire for welding X90 pipeline steel and preparing method thereof
  • Flux-cored wire for welding X90 pipeline steel and preparing method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0033] The preparation method of the above-mentioned flux-cored welding wire for X90 pipeline steel welding, the specific steps are as follows:

[0034] Step 1, weigh 30% to 55% of fluoride, 10% to 20% of oxide, 2% to 5% of carbonate, 7% to 10% of Al-Mg alloy powder and 8% to 15%, 0.5%-2.5% chromium powder, 3%-6% molybdenum powder, 1%-3% copper powder, 10%-15% electrolytic manganese, 1%-4% ferro-niobium, 0.5%-1.5% ferro-titanium %, ferrosilicon 2% to 4%, the sum of the mass percentages of each component is 100%;

[0035] Fluorides, oxides and carbonates are baked at 250°C for 1.5h before weighing; Al-Mg alloy powder, nickel powder, chromium powder, molybdenum powder, copper powder, electrolytic metal manganese, ferro-niobium, and ferro-titanium , Ferrosilicon, bake at 150°C for 1.5h before weighing;

[0036] The fluoride is a mixture of barium fluoride and lithium fluoride with a mass ratio of 6:1; the oxide is a mixture of magnesium oxide, aluminum oxide, titanium oxide and...

Embodiment 1

[0052] Step 1, weigh 471.5g of barium fluoride, 78.5g of lithium fluoride, 20g of magnesium oxide, 30g of aluminum oxide, 10g of titanium oxide, 40g of silicon dioxide, 20g of sodium carbonate, 70g of Al-Mg alloy powder, nickel powder 80g, chromium powder 5g, molybdenum powder 30g, copper powder 10g, electrolytic manganese metal 100g, ferro-niobium 10g, ferro-titanium 5g, ferrosilicon 20g;

[0053] Step 2, dry-mix barium fluoride, lithium fluoride, magnesium oxide, aluminum oxide, titanium oxide, silicon dioxide and sodium carbonate in a powder mixer for 0.5h and then put them into a spray granulator, Use water as a binder for granulation, and the particle size is controlled at 2-3mm;

[0054] Step 3, sintering the granules obtained in step 2 at 700°C for 0.8h, and then crushing them, and screening out the medicinal powder with a particle size of 60-100 mesh;

[0055] Step 4, uniformly mixing the drug powder obtained in step 3 with Al-Mg alloy powder, nickel powder, chromium ...

Embodiment 2

[0059] Step 1, weigh barium fluoride 257g, lithium fluoride 43g, magnesium oxide 100g, aluminum oxide 30g, titanium oxide 50g, silicon dioxide 20g, sodium carbonate 30g, Al-Mg alloy powder 90g, nickel powder 100g, Chromium powder 10g, molybdenum powder 50g, copper powder 20g, electrolytic manganese metal 120g, ferro-niobium 30g, ferro-titanium 10g, ferrosilicon 40g;

[0060] Step 2, dry-mix barium fluoride, lithium fluoride, magnesium oxide, aluminum oxide, titanium oxide, silicon dioxide and sodium carbonate in a powder mixer for 0.6h and then put them into a spray granulator, Use water as a binder for granulation, and the particle size is controlled at 2-3mm;

[0061] Step 3, sintering the granules obtained in step 2 for 0.7 hours at 720° C. and then crushing, and screening out the powder with a particle size of 60 to 100 mesh;

[0062] Step 4, uniformly mixing the drug powder obtained in step 3 with Al-Mg alloy powder, nickel powder, chromium powder, molybdenum powder, cop...

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Abstract

The invention discloses a flux-cored wire for welding X90 pipeline steel. The flux-cored wire for welding the X90 pipeline steel comprises a flux core and skin. The flux core comprises, by mass, 30%-55% of fluoride, 10%-20% of oxide, 2%-5% of carbonate, 7%-10% of Al-Mg, 8%-15% of nickel powder, 0.5%-2.5% of chromium powder, 3%-6% of molybdenum powder, 1%-3% of copper powder, 10%-15% of electrolytic manganese metal, 1%-4% of ferrocolumbium, 0.5-1.5% of ferrotitanium, and 2%-4% of ferrosilicon. According to the flux-cored wire for welding the X90 pipeline steel, through control over the addition of the denitrfying agent and the oxygen agent and the slag making function and the gas making function of the fluoride, a good slag-gas-metal triune self-protection function is achieved; the arcing performance and the arc stabilizing performance are good, the fluidity of a molten bath is high, splashed particles are fine and small, slag is evenly covered after welding, slag removal is easy, and formed weld joints are delicate and attractive.

Description

technical field [0001] The invention belongs to the technical field of metal welding materials, and in particular relates to a flux-cored welding wire used for welding X90 pipeline steel, and also relates to a preparation method of the flux-cored welding wire. Background technique [0002] As the demand for oil and natural gas continues to grow around the world, improving transmission efficiency and reducing pipeline laying costs have become an important part of the global economy. Therefore, high-grade pipeline steel will become the main steel used for oil and gas pipeline laying. Therefore, the development of matching welding materials and complete sets of technology and product development has become a top priority. The development of self-shielding flux-cored wires with good welding process performance, excellent mechanical properties, high construction efficiency and satisfying all-position welding construction will greatly solve the problem of matching welding consumab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/368B23K35/40
CPCB23K35/368B23K35/40
Inventor 张敏任晓龙刘明志舒绍燕张明
Owner XIAN UNIV OF TECH
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