Little slag self-protection hard-surface flux-cored wire for build-up welding

A self-protection and hard surface technology, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of reducing work efficiency and increasing the workload of construction personnel, so as to improve production efficiency, reduce workload, cost reduction effect

Inactive Publication Date: 2014-06-18
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] On the other hand, during the surfacing process of the existing hardfacing flux-cored welding wire, slag crusts will be produced on the surface of the weld bead, and the surface slag crusts need to be removed during continuous surfacing welding, which increases the labor of construction personnel. workload, while reducing work efficiency

Method used

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  • Little slag self-protection hard-surface flux-cored wire for build-up welding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Choose a 12x0.3 (width 12mm, thickness 0.3mm) low carbon steel strip, and roll it into a U shape after cleaning. Take 1300g of high-carbon ferrochromium, 70g of high-carbon ferromanganese, 30g of 75# ferrosilicon, 50g of graphite, 50g of iron powder, TiO 2 6g, calcium fluoride 3g, sodium fluorosilicate 5g, calcium carbonate 3g, aluminum-magnesium alloy powder 9g, put them together in a drying oven at 120 degrees Celsius and bake for 4 hours, then put them into a mixer and mix well. The mixed medicine powder is added into the U-shaped steel belt groove through a powder feeder to form, and the filling rate of the medicine powder is 47%. The wire is drawn and reduced to a diameter of 2.8 mm by a wire drawing machine for 5 times. Under the voltage of 29.6-30.3V and the current of 280-360A, open arc surfacing welding is carried out, and the macroscopic hardness of the surfacing layer is 56HRC.

Embodiment 2

[0031] Choose a 16x0.4 (width 16mm, thickness 0.4mm) low-carbon steel strip, and roll it into a U shape after cleaning. Take 1400g of high-carbon ferrochrome, 65g of high-carbon ferromanganese, 50g of 45# ferrosilicon, 55g of graphite, 25g of iron powder, TiO 2 10g, calcium fluoride 5g, fluoride 5g, lithium fluoride 3g, sodium fluorosilicate 3g, calcium carbonate 3g, aluminum-magnesium alloy powder 15g, put them together in a drying oven at 120 degrees Celsius and bake for 4 hours, then put them in the mixing Mix well in the feeder. The mixed powder is added to the U-shaped steel belt groove through a powder feeder to form, and the filling rate of the powder is 49%. The wire is drawn and reduced to a diameter of 3.2 mm by a wire drawing machine for 6 times. Under the voltage of 29.6-30.3V and the current of 300-420A, open arc surfacing welding is carried out, and the macroscopic hardness of the surfacing layer is 58HRC.

Embodiment 3

[0033] Choose a 12x0.3 (width 12mm, thickness 0.3mm) low carbon steel strip, and roll it into a U shape after cleaning. Take 1200g of high-carbon ferrochrome, 65g of high-carbon ferromanganese, 30g of 75# ferrosilicon, 45g of graphite, 50g of iron powder, TiO 2 8g, lithium fluoride 4g, sodium fluorosilicate 8g, sodium carbonate 5g, aluminum-magnesium alloy powder 13g, put them together in a drying oven at 120 degrees Celsius and bake for 4 hours, then put them into a mixer and mix well. The mixed powder is fed into the U-shaped steel belt groove through the powder feeder to form, and the filling rate of the powder is 50%. The wire is drawn and reduced to a diameter of 2.8mm by a wire drawing machine for 4 times. Under the voltage of 29.6-30.3V and the current of 280-360A, open arc surfacing welding is carried out, and the macroscopic hardness of the surfacing layer is 55HRC.

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Abstract

The invention relates to a little slag self-protection hard-surface flux-cored wire for build-up welding. The little slag self-protection hard-surface flux-cored wire consists of a low-carbon steel strip and a flux-cored wire, and is characterized in that the flux-cored wire comprises the following components in percentage by mass: 75 to 90 percent of high carbon ferro-chrome, 3.5 to 5.5 percent of ferromanganese, 1 to 4.0 percent of ferrosilicon, 2.5 to 4 percent of graphite, 0.2 to 2 percent of TiO2, 0.2 to 2 percent of fluoride, 0 to 1 percent of carbonate, 0.2 to 2 percent of aluminum magnesium alloy powder and the balance of iron powder. According to the little slag self-protection hard-surface flux-cored wire, the aim of reducing the cost of the flux-cored wire is fulfilled under the condition that the hardness and abrasive resistance of the conventional build-up welding layer are not reduced; and according to the flux-cored wire, little slag can be formed on the surface of a welding bead and can fall off automatically after the surface is sprayed by water, so that the workload is reduced, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of surfacing welding materials. Background technique [0002] In industries such as metallurgy, power generation, mining, building materials, coal, cement, etc., there are serious wear and tear problems of equipment under many working conditions, causing premature damage to equipment and requiring shutdown for maintenance or replacement. Therefore, it is of great significance to develop high-performance anti-wear materials and improve the service life of equipment to reduce downtime and maintenance, increase production, and increase benefits. [0003] Fe-Cr-C surfacing alloys exhibit good wear resistance due to the combination of primary hard phases, eutectic carbides and a softer Fe matrix, are inexpensive and have good high-temperature performance and are widely used in these used in industrial production. [0004] At present, flux-cored wires containing only iron, chromium, carbon, silicon, and manganes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/368B23K35/40
Inventor 刘军军张萌郭守晖
Owner NANCHANG UNIV
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