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Self-protection flux-cored wire for 25Cr2Ni4MoV and preparation method thereof

A flux-cored wire, self-protection technology, applied in welding equipment, welding media, manufacturing tools, etc., can solve the problems of failure, scarcity, poor impact toughness, etc., and achieve the effects of convenient operation, simple preparation method and less welding spatter

Active Publication Date: 2018-04-13
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the matching welding consumables for 25Cr2Ni4MoV alloy steel on the market are extremely rare, and the impact toughness is poor, which often leads to its failure in engineering applications
In addition, there are only a few reports on the welding process of 25Cr2Ni4MoV alloy steel welding, and no reports on its fusion welding self-shielding flux cored wire

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0042] The preparation method of 25Cr2Ni4MoV self-shielding flux-cored welding wire, the specific steps are as follows:

[0043]Step 1: Weigh chromium powder 12%-15%, nickel powder 20%-24%, molybdenum powder 3%-6%, vanadium powder 2%-4%, copper powder 2%-4%, fluorine Barium oxide 25%-30%, marble 5%-8%, aluminum-magnesium alloy 4%-8%, rutile 8%-12%, quartz sand 6%-10%, the sum of the mass percentages of the above components is 100%;

[0044] Step 2: Mix the barium fluoride, marble, aluminum-magnesium alloy, and quartz sand weighed in step 1 to obtain a mixed drug powder A, add water glass binder to the mixed drug powder A and mix evenly, and then place it in a heating furnace for sintering. Crush and sieve to obtain the mixed medicinal powder B; in step 2: the sintering temperature is 650-750°C, the sintering time is 4-6h, and the sieving particle size is 60-140 mesh;

[0045] Step 3: Mix the chromium powder, nickel powder, molybdenum powder, vanadium powder, copper powder, ru...

Embodiment 1

[0050] The preparation method of 25Cr2Ni4MoV self-shielding flux-cored welding wire, the specific steps are as follows:

[0051] Step 1: Weigh 12% of chromium powder, 20% of nickel powder, 6% of molybdenum powder, 2% of vanadium powder, 4% of copper powder, 25% of barium fluoride, 6% of marble, 8% of aluminum-magnesium alloy, 8% rutile, 9% quartz sand, the sum of the mass percentages of the above components is 100%;

[0052] Step 2: Mix barium fluoride, marble, aluminum-magnesium alloy, and quartz sand weighed in step 1 to obtain mixed powder A, add water glass binder to mixed powder A and mix well, then place in a heating furnace at 750°C Sintering for 4 hours, crushing, and passing through a 60-140 mesh sieve to obtain mixed medicinal powder B;

[0053] Step 3: Mix the chromium powder, nickel powder, molybdenum powder, vanadium powder, copper powder, rutile powder weighed in step 1 and the mixed powder B obtained in step 2, and dry in a vacuum drying oven at 200°C 2h, obta...

Embodiment 2

[0059] The preparation method of 25Cr2Ni4MoV self-shielding flux-cored welding wire, the specific steps are as follows:

[0060] Step 1: Weigh 13% of chromium powder, 21% of nickel powder, 4% of molybdenum powder, 3% of vanadium powder, 3% of copper powder, 25% of barium fluoride, 8% of marble, 7% of aluminum-magnesium alloy, 10% rutile, 6% quartz sand, the sum of the mass percentages of the above components is 100%;

[0061] Step 2: Mix barium fluoride, marble, aluminum-magnesium alloy, and quartz sand weighed in step 1 to obtain mixed powder A, add water glass binder to mixed powder A and mix well, then place in a heating furnace at 650°C Sintering for 6 hours, crushing, and passing through a 60-140 mesh sieve to obtain mixed medicinal powder B;

[0062] Step 3: Mix the chromium powder, nickel powder, molybdenum powder, vanadium powder, copper powder, rutile powder weighed in step 1 and the mixed powder B obtained in step 2, and dry in a vacuum drying oven at 250 °C 2h, ob...

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Abstract

The invention discloses a self-protection flux-cored wire for 25Cr2Ni4MoV. The self-protection flux-cored wire comprises a flux core and a welding skin. The flux core comprises, by mass, 12%-15% of chromium powder, 20%-24% of nickel powder, 3%-6% of molybdenum powder, 2%-4% of vanadium powder, 2%-4% of copper powder, 25%-30% of barium fluoride, 5%-8% of marble, 4%-8% of aluminum-magnesium alloy, 8%-12% of rutile and 6%-10% of quartz sand. The sum of the mass percentages of the above components is 100%. The preparation method comprises the following steps of adding raw material components intoa U-shaped groove, rolling and closing, drawing and straightening, forming a disc into a disc, and sealing and packaging. The flux-cored wire is beautiful in appearance of welding seams, and the welding joints have excellent mechanical properties. The invention discloses a preparation method. The preparation method is simple, convenient to operate and capable of being used for mass production.

Description

technical field [0001] The invention belongs to the technical field of metal material welding, and in particular relates to a self-shielding flux-cored welding wire for 25Cr2Ni4MoV, and also relates to a preparation method of the welding wire. Background technique [0002] In recent years, with the advancement of my country's industrialization process, the industrial sector is vigorously carrying out energy conservation and consumption reduction, industrial upgrading and integration and reorganization, and industrial infrastructure equipment needs a large number of updates. Centrifugal fans, as important supporting equipment in industry, will be more widely used in fields such as electric power, cement, petrochemical, coal, mining and environmental protection. The centrifugal fan is based on the principle of converting kinetic energy into potential energy. It uses a high-speed rotating impeller to accelerate the gas, then decelerates, changes the flow direction, and converts...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/24B23K35/368B23K35/40
CPCB23K35/24B23K35/368B23K35/40
Inventor 张敏慕二龙程康康史杰李乐王裕
Owner XIAN UNIV OF TECH
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