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Self-generated wear-resistant surfacing self-protected flux-cored wire reinforced by boron carbide with great volume fraction and preparation method for self-generated wear-resistant surfacing self-protected flux-cored wire

A boron carbide, flux-cored wire technology, applied in welding equipment, welding media, manufacturing tools, etc., can solve the problems of limited addition of alloying elements, inability to obtain hard phase, limited addition of alloying elements, etc., to achieve alloy homogenization High degree, good welding process performance, good welding process performance

Active Publication Date: 2016-11-23
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structural characteristics of the self-shielding flux-cored wire make it very limited to add alloying elements in the flux core. In the traditional self-shielding flux-cored wire, the amount of slagging agent added often reaches about 50% (mass fraction), and the alloying elements The addition amount of surfacing alloy is very limited, and it is impossible to obtain a sufficient volume fraction of hard phase, which inevitably limits the further improvement of the wear resistance of surfacing alloys.

Method used

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Embodiment 1

[0030]A self-generated large volume fraction boron carbide reinforced wear-resistant surfacing self-shielding flux-cored wire, including a low-carbon steel strip and a flux core, the flux core is filled in the steel strip, and the composition of the flux core is prepared according to the following quality: 62g of 80 mesh High-carbon ferrochrome, 6g of 80-mesh chromium powder, 22g of 80-mesh ferroboron, 2g of graphite, 2g of aluminum-magnesium alloy, 5g of silicon-manganese alloy, 1g of 80-mesh iron powder, of which graphite, aluminum-magnesium alloy and Silicon-manganese alloys are added in two particle sizes of 60 mesh and 200 mesh, and the mass fractions of 60 mesh and 200 mesh in each added powder account for 50% respectively. The various powders taken are put into the powder mixer, mixed for 40 minutes, and then the mixed powder is added into the U-shaped 21×0.5mm H08A carbon steel belt groove, and the filling rate is 57%. Then close the U-shaped groove so that the powder ...

Embodiment 2

[0032] A self-generated large volume fraction boron carbide reinforced wear-resistant surfacing self-shielding flux-cored wire, including a low-carbon steel strip and a flux core, the flux core is filled in the steel strip, and the composition of the flux core is prepared according to the following quality: 52g of 80 mesh High-carbon ferrochrome, 2g of 80-mesh chromium powder, 25g of 80-mesh ferroboron, 3g of graphite, 1g of aluminum-magnesium alloy, 8g of silicon-manganese alloy, 9g of 80-mesh iron powder, of which graphite, aluminum-magnesium alloy and Silicon-manganese alloys are added in two particle sizes of 60 mesh and 200 mesh, and the mass fractions of 60 mesh and 200 mesh in each added powder account for 50% respectively. Put the various powders taken into the powder mixer, mix for 40 minutes, then add the mixed powder into the U-shaped 21×0.5mm H08A carbon steel belt groove, and the filling rate is 58%. Then close the U-shaped groove so that the powder is wrapped the...

Embodiment 3

[0034] A self-generated large volume fraction boron carbide reinforced wear-resistant surfacing self-shielding flux-cored wire, including a low-carbon steel strip and a flux core, the flux core is filled in the steel strip, and the composition of the flux core is prepared according to the following quality: 55g of 80 mesh High-carbon ferrochrome, 3g of 80-mesh chromium powder, 30g of 80-mesh ferroboron, 4g of graphite, 2g of aluminum-magnesium alloy, 4g of silicon-manganese alloy, 2g of 80-mesh iron powder, of which graphite, aluminum-magnesium alloy and Silicon-manganese alloys are added in two particle sizes of 60 mesh and 200 mesh, and the mass fractions of 60 mesh and 200 mesh in each added powder account for 50% respectively. Put the various powders taken into the powder mixer, mix for 40 minutes, then add the mixed powder into the U-shaped 21×0.5mm H08A carbon steel belt groove, and the filling rate is 60%. Then close the U-shaped groove so that the powder is wrapped the...

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Abstract

The invention discloses a self-generated wear-resistant surfacing self-protected flux-cored wire reinforced by boron carbide with great volume fraction and a preparation method for the self-generated wear-resistant surfacing self-protected flux-cored wire. By taking a low-carbon steel belt as skin, the flux-cored wire consists of the following components in percentage by mass: 52-62% of high carbon ferro-chrome, 2-6% of chromium powder, 22-30% of ferroboron, 2-4% of graphite, 1-3% of an aluminum-magnesium alloy, 4-8% of a silicon-manganese alloy, and the balance iron powder; the graphite, the aluminum-magnesium alloy and the silicon-manganese alloy are added with grain sizes being 60 meshes and 200 meshes; and the flux core powder accounts for 55-60% of the total weight of the flux-cored wire. According to the flux-cored wire provided by the invention, flux core components with different grain sizes are added, so that good welding process performances are guaranteed; the flux core components are reasonably proportioned with other flux core components, so that boron carbide with mass fraction being 90% or more, namely (Cr, Fe)7(C, B) 3 and (Cf, Fe)3(C, B), is obtained in a surfacing alloy structure, hardness of a surfacing layer is as high as 65-68 HRC, and wear resistance of abrasives resistant to low stress is extremely good; and the welding process performances are good, deposition efficiency is high, and multi-layer welding is carried out while slag does not need to clear.

Description

technical field [0001] The invention belongs to the field of welding in material processing engineering, and in particular relates to a self-generated large volume fraction boron carbide reinforced wear-resistant surfacing welding self-protected flux-cored welding wire and a preparation method thereof. Background technique [0002] As a green manufacturing process, surfacing welding is widely used in the repair or remanufacture of various wear-resistant parts. Due to low cost and easy preparation, Cr 7 C 3 High-chromium cast iron surfacing alloys with type carbides as wear-resistant skeletons are widely used. Generally speaking, the larger the volume fraction of carbide hard phase, the better the wear resistance of the surfacing alloy. [0003] Self-shielding flux-cored wire is widely recognized and used as a surfacing material due to its convenient composition adjustment, no additional auxiliary gas, and high welding efficiency. However, the structural characteristics o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/02B23K35/30B23K35/368B23K35/40
CPCB23K35/0266B23K35/3086B23K35/368B23K35/406
Inventor 刘大双魏萍黄文斌卢聪
Owner JIANGSU UNIV OF SCI & TECH
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