# US 2019/0168345 A1 · High-efficient energy-saving and surfacing layer well-forming self-shielded flux-cored welding wire and manufacture method

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- Number: US 2019/0168345 A1
- Document ID: US20190168345A1
- Status: Published application
- Kind: A1
- Application number: 15/747,121
- Filed: 2017-05-12
- Published: 2019-06-06
- Earliest claimed: 2016-07-28
- Assignees: Jiangsu University of Science and Technology
- Applicants: Jiangsu University of Science and Technology
- Inventors: Dashuang LIU; Ping WEI; Mingfang WU
- Web page: https://patentgrep.com/patent/US20190168345A1

## CPC

- B23K 35/3053: {Fe as the principal constituent}
- B23K 35/0244: {Powders, particles or spheres; Preforms made therefrom}
- B23K 35/0266: {flux-cored}
- B23K 35/30: with the principal constituent melting at less than 1550°C
- B23K 35/40: Making wire or rods for soldering or welding
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM

## Abstract

It discloses a high-efficient energy-saving and surfacing layer well-forming self-shielded flux-cored welding wire. A low-carbon steel strip is used as an outer cover, and a flux core comprises the following components in percentage by mass: 42-60% high carbon ferrochrome with a particle size of 80 meshes, 10-18% ferrosilicon, 16-25% ferroboron, 2-8% rare earth silicon, 2-8% graphite, 1-4% aluminum magnesium alloy, 2-5% manganese powder and the balance of iron powder, wherein the graphite, the aluminum magnesium alloy and the manganese powder are all added with two particle sizes including 60 meshes and 200 meshes, and the weight of the flux core powder accounts for 49-53% of the total weight of the welding wire.

## Claims

### Claim 1

A high-efficient energy-saving and surfacing layer well-forming self-shielded flux-cored welding wire, comprising a low-carbon steel strip and a flux core, wherein the flux core is filled in the steel strip, and the scope of the percentage by mass of the flux core is as follows: 42-60% high carbon ferrochrome with a particle size of 80 meshes, 10-18% ferrosilicon, 16-25% ferroboron, 2-8% rare earth silicon, 2-8% graphite, 1-4% aluminum magnesium alloy, 2-5% manganese powder and the balance of iron powder, wherein the graphite, the aluminum magnesium alloy and the manganese powder are added with two particle sizes including 60 meshes and 200 meshes, and the weight of the flux core powder accounts for 49-53% of the total weight of the welding wire.

### Claim 2 (depends on 1)

The high-efficient energy-saving and surfacing layer well-forming self-shielded flux-cored welding wire according to claim 1, wherein the carbon content of the high carbon ferrochrome is 9-10 wt %, the chrome content is 60-70 wt %, and the balance is iron; the silicon content of the ferrosilicon is 72-80 wt %, and the balance is iron; the rare earth content of the rare earth silicon is 24-27 wt %, the silicon content is 38-43 wt %, and the balance is iron; the boron content of the ferroboron is 19-25 wt %, and the balance is iron; and the aluminum content of the aluminum magnesium alloy is 47-53 wt %, and the balance is magnesium.

### Claim 3 (depends on 1)

The high-efficient energy-saving and surfacing layer well-forming self-shielded flux-cored welding wire according to claim 1, wherein the graphites with different particle sizes including the graphite of 60 meshes and the graphite of 200 meshes are added by means of combination with a mass ratio of 1:1.

### Claim 4 (depends on 1)

The high-efficient energy-saving and surfacing layer well-forming self-shielded flux-cored welding wire according to claim 1, wherein the aluminum magnesium alloys with different particle sizes including the aluminum magnesium alloy of 60 meshes and the aluminum magnesium alloy of 200 meshes are added by means of combination with a mass ratio of 1:1.

### Claim 5 (depends on 1)

The high-efficient energy-saving and surfacing layer well-forming self-shielded flux-cored welding wire according to claim 1, wherein the manganese powders with different particle sizes including the manganese powder of 60 meshes and the manganese powder of 200 meshes are added by means of combination with a mass ratio of 1:1.

### Claim 6 (depends on 1)

The high-efficient energy-saving and surfacing layer well-forming self-shielded flux-cored welding wire according to claim 1, wherein the particle sizes of the components of the high carbon ferrochrome, the high carbon ferrochrome, the ferroboron, ferrosilicon and the iron powder are all equal to 80 meshes.

### Claim 7 (depends on 1)

The high-efficient energy-saving and surfacing layer well-forming self-shielded flux-cored welding wire according to claim 1, wherein the thickness×the width of the low-carbon steel strip are equal to 0.5×21 mm.

### Claim 8 (depends on 1)

The high-efficient energy-saving and surfacing layer well-forming self-shielded flux-cored welding wire according to claim 1, wherein the diameter of the welding wire is any one of 2.8 mm, 3.2 rnm, 3.5 mm, 3.8 mm and 4.2 mm.

### Claim 9 (depends on 1)

A manufacture method of the high-efficient energy-saving and surfacing layer well-forming self-shielded flux-cored welding wire according to claim 1, comprising the following steps of:
(1) rolling the low-carbon steel strip in a U shape by a molding roller, and then adding the flux core powder of the present invention into a U-shape groove through a powder delivery device according to 49-53% of the total weight of the welding wire of the present invention; and
(2) closing the opening of the U-shape groove to cover the flux core in the U-shape groove, drawing and reducing the diameter through a wire-drawing die one by one, and finally making the diameter thereof reach 2.8-4.2 mm to obtain a final product.