WC particle-reinforced Ni-based MIG hardfacing flux-cored wire

A technology of particle reinforcement and welding wire, applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve problems such as wear and tear, and achieve the effect of uniform surfacing layer, high welding quality, easy automation and mechanization

Inactive Publication Date: 2013-11-27
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The ultimate goal to be achieved by the present invention is: use a kind of WC particle of the present invention to strengthen the nickel-based wear-resistant surfacing welding flux-cored wire, prepare the surfacing alloy with MIG, make the surfacing layer have the wear-resistant characteristics of cemented carbide composite materials, Solve the problem of abrasive wear of picks, prolong the service life of picks and reduce costs

Method used

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  • WC particle-reinforced Ni-based MIG hardfacing flux-cored wire

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preparation example Construction

[0035] The nickel-based surfacing flux-cored wire for coal mine picks provided by the present invention, the strip material used in the flux-cored wire sheath is a pure nickel strip with a content of more than 99%, and the filling rate of the flux-cored wire is 30-40%. The core powder includes the following substances in mass percentage: tungsten carbide: 30-75%; silicon carbide: 4-17%; boron carbide: 3-15%; electrolytic manganese powder: 1-5%; sodium fluoride: 1- 12%, the balance is nickel powder. The preparation method of nickel-based surfacing flux-cored welding wire for coal mine picks of the present invention comprises the following steps:

[0036] 1. Roll the Ni strip into a U shape, then add the flux core powder accounting for 30-40% of the flux cored wire gross weight of the present invention in the U shape groove;

[0037] 2. Close the U-shaped groove, wrap the drug core in it, pass through the wire drawing die, draw and reduce the diameter one by one, and finally ma...

Embodiment 1

[0048] Embodiment 1. A nickel-based wear-resistant surfacing flux-cored wire reinforced with WC particles, including 0.45 kg of cast tungsten carbide, 0.06 kg of silicon carbide, 0.045 kg of boron carbide, 0.010 kg of electrolytic manganese powder, and 0.01 kg of sodium fluoride. Add the obtained flux core powder into the U-shaped nickel tape groove, the filling rate is 37%, and close the U-shaped groove to obtain a WC particle-reinforced wear-resistant surfacing flux-cored wire with a diameter of 1.6mm. The welding process parameters are: 100% argon gas protection, voltage 19V, current 160A. The alloy composition in the obtained deposited metal is: WC: 11.1wt.%; Si: 1.3wt.%; B: 1wt.%; Mn: 0.3wt.%; Ni: balance.

Embodiment 2

[0049] Embodiment 2. A nickel-based wear-resistant surfacing flux-cored wire reinforced with WC particles, including 1.125 kg of cast tungsten carbide, 0.255 kg of silicon carbide, 0.225 kg of boron carbide, 0.075 kg of electrolytic manganese powder, and 0.18 kg of sodium fluoride. Add the obtained flux core powder into the U-shaped nickel tape groove, the filling rate is 40%, and close the U-shaped groove to obtain a WC particle-reinforced wear-resistant surfacing flux-cored wire with a diameter of 1.6mm. The welding process parameters are: 100% argon gas protection, voltage 24V, current 230A. The alloy composition in the obtained deposited metal is: WC: 30wt.%; Si: 5.6wt.%; B: 5wt.%; Mn: 1.48wt.%;

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Abstract

The invention discloses a WC particle-reinforced Ni-based MIG hardfacing flux-cored wire and belongs to surface-modified cored wires used in the technical field of engineering application. The flux-cored wire is composed of a nickel strap wrapper and core portion powder. Core ingredients comprise, by mass, 30%-75% of tungsten carbide, 4%-17% of silicon carbide, 3%-15% of boron carbide, 1%-5% of electrolytic manganese powder, 1%-12% of sodium fluoride and the balance of nickel powder. Ingredients of obtained deposited metal comprise 11.1%-30% of tungsten carbide, 1.3%-5.6% of silicon, 1%-5% of boron, 0.3%-1.48% of manganese and the balance of nickel. A surfacing layer prepared by flux-cored wires is high in hardness (>45HRC), and the hardness of WC hard phases in the surfacing layer reaches 1800HV0.3. According to the WC particle-reinforced Ni-based MIG hardfacing flux-cored wire, the 'shadow protection' effect is achieved mainly through matching of added WC particles and a Ni-based substrate, and therefore wear resistance can be achieved; besides, welding performance of surfacing alloy is improved by adding the deoxidizing agents including silicon and manganese, alterative Na / F and the like.

Description

technical field [0001] The invention relates to a WC particle-reinforced nickel-based MIG wear-resistant surfacing flux-cored welding wire, which belongs to the field of welding materials. It can be widely used in wear-resistant parts of machinery in mining, machinery, electric power and other industries. It can also be repaired by surfacing welding and manufacture new wear-resistant parts. The flux-cored welding wire of the invention is mainly used for picks in the coal industry. Background technique [0002] According to statistics, 70% of the reasons for premature failure of mechanical equipment are due to wear and corrosion, and 1 / 3 to 1 / 2 of energy is consumed in friction and wear in each production process. In metallurgy, power generation, mining, building materials, coal and other industries, there are serious wear and tear problems of equipment in many working conditions, resulting in premature equipment damage, requiring shutdown for maintenance or replacement, aff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/368B23K35/40B23K9/04
Inventor 贺定勇周正田丽纷刘飞蒋建敏崔丽王智慧李晓延
Owner BEIJING UNIV OF TECH
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