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A self-shielding flux-cored welding wire for ultra-high content vanadium modified surfacing welding and its preparation method

A technology of flux-cored welding wire and self-protection, applied in welding equipment, welding medium, manufacturing tools, etc., to achieve the effect of simple and reliable preparation method, high deposition efficiency, and high degree of alloy homogenization

Active Publication Date: 2018-07-06
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no technical disclosure on improving the self-protection effect of welding wire by controlling the particle size of components

Method used

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  • A self-shielding flux-cored welding wire for ultra-high content vanadium modified surfacing welding and its preparation method

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Comparison scheme
Effect test

Embodiment 1

[0035] A self-shielding flux-cored welding wire for ultra-high vanadium modified surfacing welding, 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: 58g of 80-mesh high-carbon chromium Iron, 28g of 80-mesh iron vanadium, 1g of graphite, 1g of aluminum-magnesium alloy, 9g of silicon-manganese alloy, 3g of 80-mesh iron powder, of which graphite, aluminum-magnesium alloy and silicon-manganese alloy are all 60 mesh and 200 mesh Two particle sizes were added, and the mass fractions of 60 mesh and 200 mesh in each powder added accounted 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 50%. Then close the U-shaped groove so that the powder is wrapped therein. Then make it pass through one or more of th...

Embodiment 2

[0037] A self-shielding flux-cored welding wire for ultra-high vanadium modified surfacing welding, including a low-carbon steel strip and a flux core, the flux core is filled in the steel strip, and the flux core components are prepared according to the following quality: 52g of 80-mesh high-carbon chromium Iron, 36g of 80-mesh iron vanadium, 1.5g of graphite, 3g of aluminum-magnesium alloy, 3g of silicon-manganese alloy, 4.5g of 80-mesh iron powder, wherein graphite, aluminum-magnesium alloy and silicon-manganese alloy are all made of 60 mesh and Two particle sizes of 200 mesh were added, and the mass fractions of 60 mesh and 200 mesh in each powder added accounted 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 54%. Then close the U-shaped groove so that the powder is wrapped therein. Then make it pass thr...

Embodiment 3

[0039] A self-shielding flux-cored welding wire for ultra-high vanadium modified surfacing welding, 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: 54g of 80-mesh high-carbon chromium Iron, 30g of 80-mesh iron vanadium, 2g of graphite, 4g of aluminum-magnesium alloy, 5g of silicon-manganese alloy, 5g of 80-mesh iron powder, of which graphite, aluminum-magnesium alloy and silicon-manganese alloy are all 60 mesh and 200 mesh Two particle sizes were added, and the mass fractions of 60 mesh and 200 mesh in each powder added accounted 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 52%. Then close the U-shaped groove so that the powder is wrapped therein. Then make it pass through on...

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Abstract

The invention discloses a modified self-shielded flux-cored wire with ultrahigh vanadium content and used for surfacing and a preparation method thereof. Mild-carbon steel strips serve as the skin, a flux core comprises the components, by weight, of 52-58% of high carbon ferro-chrome, 28-36% of ferrovanadium, 1-2% of graphite, 1-4% of an aluminum magnesium alloy, 3-9% of a silicon manganese alloy and the balance ferrous powder, and the graphite, the aluminum magnesium alloy and the silicon manganese alloy which are each of at least two different granularities are added. According to the modified self-shielded flux-cored wire provided by the invention, the good welding process performance is guaranteed by adding the flux-core components of different granularities; since an appropriate amount of V is added into the flux core, transformation from the hypereutectic structure of high-chromium cast iron to a hypoeutectic structure is promoted, and the tenacity of a surfacing layer is remarkably improved; and the hardness is high, the abrasive resistance is excellent, the welding process performance is good, the melting efficiency is high, and slag removing is not needed for multi-layer welding.

Description

technical field [0001] The invention belongs to the field of welding in material processing engineering, and in particular relates to a self-shielding flux-cored welding wire for ultra-high content vanadium modified surfacing welding 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. Coarse Cr in hypereutectic structure of high chromium cast iron surfacing alloy 7 C 3 Type carbide, on the one hand, is beneficial to improve wear resistance, on the other hand, it is prone to metallurgical defects and microcracks, and is very brittle, which becomes an important reason why surfacing alloys develop into macrocracks or even cracks during service. . Therefore, overcoming the defects of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/02B23K35/30B23K35/368B23K35/40
CPCB23K35/0266B23K35/3086B23K35/368B23K35/406
Inventor 刘大双魏萍祁凯
Owner JIANGSU UNIV OF SCI & TECH
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