CN111992924A - 500 MPa-level flux-cored wire and preparation method thereof - Google Patents

Abstract

The invention discloses a 500 MPa-level flux-cored wire and a preparation method thereof, wherein the flux-cored wire consists of a low-carbon steel strip and medicinal powder, the medicinal powder is wrapped in the low-carbon steel strip, and the medicinal powder consists of the following components in parts by mass: 2-8 parts of arc stabilizer, 1-5 parts of catalyst, 5-15 parts of silicon-manganese alloy, 5-10 parts of ferrosilicon, 5-15 parts of electrolytic manganese and 55-75 parts of reduced iron powder, the welding wire is low in manufacturing cost, the surface of the welding wire is free of slag after welding, slag cleaning is not needed when multilayer and multi-pass welding is carried out, the welding efficiency is greatly improved, the labor intensity of workers is reduced, the welding wire meets the tensile strength of 500Mpa, the intensity is high, the application range is wide, the welding process is environment-friendly, welding spatters are small, smoke dust is small, the welding wire is high in efficiency, and the welding wire can be popularized to robot welding and has a wide development prospect.

Description

500 MPa-level flux-cored wire and preparation method thereof

Technical Field

The invention belongs to the field of metal welding materials, and particularly relates to a 500 MPa-level flux-cored wire and a preparation method thereof.

Background

At present, the domestic flux-cored wire production technology and formula are relatively mature, the current flux-cored wire can generate slag crust in the use process, and the cladding effect can achieve certain welding performance and the attractive appearance of a welding seam. In the traditional 500MPa titanium oxide, titanium calcium type and calcium oxide type flux-cored wires, the powder contains more slagging components, and if multilayer and multi-pass welding is carried out, slag removal is carried out every time a welding seam is welded, so that the labor intensity of workers is greatly increased, and the welding efficiency is influenced.

Accordingly, further developments and improvements are still needed in the art.

Disclosure of Invention

Aiming at various defects in the prior art, in order to solve the problems, a 500 MPa-grade flux-cored wire and a preparation method thereof are provided, wherein the flux-cored wire has the advantages of small welding spatter, less smoke, high cladding efficiency and the like, and does not generate slagging while meeting the requirement of 500MPa of tensile strength.

In order to achieve the purpose, the invention provides the following technical scheme:

the 500 MPa-level flux-cored wire consists of a low-carbon steel strip and powder, wherein the powder is wrapped in the low-carbon steel strip and comprises the following components in parts by mass: 2-8 parts of arc stabilizer, 1-5 parts of catalyst, 5-15 parts of silicon-manganese alloy, 5-10 parts of ferrosilicon, 5-15 parts of electrolytic manganese and 55-75 parts of reduced iron powder.

Preferably, the filling rate of the medicinal powder is 14-18%.

Preferably, the granularity and the mesh number of the medicinal powder are 60-200 meshes.

Preferably, the diameter of the welding wire is 1.2-1.6 mm.

Preferably, the arc stabilizer is one or more of potassium titanate, sodium fluosilicate, sodium fluoride and carbonates.

Preferably, the catalyst is one or more of aluminum magnesium alloy and graphite.

Preferably, the low-carbon steel strip is an SPCC cold-rolled steel strip.

Preferably, the specification of the low-carbon steel strip is 0.4-1.0mm in thickness and 12-16mm in width.

Preferably, the tensile strength of the welding wire after welding is greater than or equal to 500 MPa.

Preferably, the preparation method of the 500MPa grade flux-cored wire comprises the following steps:

selecting a proper low-carbon steel strip, and rolling the low-carbon steel strip into a U shape through a welding wire forming machine;

heating the medicinal powder to the temperature of 100-;

and after filling, closing the opening, and then performing rough drawing, fine drawing and diameter shearing until the welding wire reaches the preset diameter.

Wherein, Si existing in the ferrosilicon, the silicon-manganese alloy, the arc stabilizer and the catalyst has good deoxidation effect, and simultaneously, the strength of the weld metal can be improved, and the fluidity of the weld metal is increased.

Ti in the arc stabilizer also has good deoxidation effect, and meanwhile, Ti can be combined with C to enhance the total mechanical property after welding.

F present in the arc stabilizer improves low temperature impact toughness during welding.

Mn existing in the electrolytic manganese and the silicon-manganese alloy can effectively prevent the weld joint from generating hot cracks and improve the formation quality of the weld joint.

Al existing in the catalyst is a strong deoxidizer, improves the deoxidizing property of weld metal, and can improve low-temperature impact toughness.

Has the advantages that:

the invention provides a 500 MPa-grade flux-cored wire which is low in manufacturing cost, free of slag on the surface after welding, free of slag removal during multilayer and multi-pass welding, greatly improved in welding efficiency, reduced in labor intensity of workers, high in strength, wide in application range, environment-friendly in welding process, small in welding spatter, small in smoke dust, high in cladding efficiency, capable of being popularized to robot welding, and wide in development prospect, and the welding wire meets the tensile strength of 500 MPa.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions of the present invention are clearly and completely described, and other similar embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application based on the embodiments in the present application.

Example 1:

the 500 MPa-level flux-cored wire consists of a low-carbon steel strip and powder, wherein the powder is wrapped in the low-carbon steel strip and comprises the following components in parts by mass: 2 parts of arc stabilizer, 4 parts of catalyst, 10 parts of silicon-manganese alloy, 6 parts of ferrosilicon, 12 parts of electrolytic manganese and 66 parts of reduced iron powder, wherein the filling rate of the powder is 14%.

Example 2:

the 500 MPa-level flux-cored wire consists of a low-carbon steel strip and powder, wherein the powder is wrapped in the low-carbon steel strip and comprises the following components in parts by mass: 4 parts of arc stabilizer, 3 parts of catalyst, 6.5 parts of silicon-manganese alloy, 15 parts of ferrosilicon, 15 parts of electrolytic manganese and 56.5 parts of reduced iron powder, and the filling rate of the powder is 14.5 percent.

Example 3:

the 500 MPa-level flux-cored wire consists of a low-carbon steel strip and powder, wherein the powder is wrapped in the low-carbon steel strip and comprises the following components in parts by mass: 6 parts of arc stabilizer, 2 parts of catalyst, 8 parts of silicon-manganese alloy, 12 parts of ferrosilicon, 10 parts of electrolytic manganese and 62 parts of reduced iron powder, wherein the filling rate of the powder is 15%.

Example 4:

the 500 MPa-level flux-cored wire consists of a low-carbon steel strip and powder, wherein the powder is wrapped in the low-carbon steel strip and comprises the following components in parts by mass: 8 parts of arc stabilizer, 1 part of catalyst, 12 parts of silicon-manganese alloy, 10 parts of ferrosilicon, 8 parts of electrolytic manganese and 61 parts of reduced iron powder, wherein the filling rate of the powder is 15.5%.

Example 5:

the 500 MPa-level flux-cored wire consists of a low-carbon steel strip and powder, wherein the powder is wrapped in the low-carbon steel strip and comprises the following components in parts by mass: 5.5 parts of arc stabilizer, 5 parts of catalyst, 5.5 parts of silicon-manganese alloy, 8 parts of ferrosilicon, 7 parts of electrolytic manganese and 69 parts of reduced iron powder, and the filling rate of the powder is 16%.

Example 6:

the 500 MPa-level flux-cored wire consists of a low-carbon steel strip and powder, wherein the powder is wrapped in the low-carbon steel strip and comprises the following components in parts by mass: 2.5 parts of arc stabilizer, 2.5 parts of catalyst, 10.5 parts of silicon-manganese alloy, 5 parts of ferrosilicon, 5 parts of electrolytic manganese and 74.5 parts of reduced iron powder, and the filling rate of the powder is 18 percent.

Example 7:

a method of preparing a flux-cored wire as described in examples 1-6, comprising:

s1: selecting a proper low-carbon steel strip, and rolling the low-carbon steel strip into a U shape through a welding wire forming machine;

s2: heating the medicinal powder to the temperature of 100-;

s3: and after filling, closing the opening, and then performing rough drawing, fine drawing and diameter shearing treatment until the welding wire reaches the preset diameter, wherein the diameter of the welding wire is 1.2-1.6 mm.

Example 8:

the welding process tests, the tensile tests and the impact tests are carried out on the prepared examples 1 to 6, the tests are carried out according to GB/T10045-2018, and the welding process specifically comprises the following steps: 80% Ar + 20% CO was used₂The mixed gas shielded welding is carried out at the current of 200-350A and the voltage of 20-35V, and the test results are shown in Table 1:

TABLE 1 welding Process, tensile and impact test results

The experimental result shows that in the welding process of the embodiment 1-the embodiment 6, the arc stability is good, the welding wire has few welding slag, the spatter is not easy to generate, a straight and non-bending welding line can be formed, and the welding wire is completely qualified.

Meanwhile, the tensile strength of the samples 1 to 6 can be more than 500MPa, the upper yield strength can be more than 425MPa, the elongation is more than 20 percent, and the low-temperature impact toughness is improved.

In conclusion, the welding wires of the embodiments 1 to 6 reach GB/T10045-2018T 492T15-0M21A, and completely meet the use requirements.

The present invention has been described in detail, and it should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

Claims (9)

1. The 500 MPa-level flux-cored wire is characterized by comprising a low-carbon steel strip and powder, wherein the powder is wrapped in the low-carbon steel strip and comprises the following components in parts by mass:

2. the 500MPa grade flux cored wire of claim 1, wherein the powder fill rate is 14% -18%.

3. The 500MPa grade flux-cored wire of claim 1, wherein the powder particle size is 60-200 mesh.

4. The 500MPa grade flux cored welding wire of claim 1, wherein the diameter of the wire is 1.2-1.6 mm.

5. The 500MPa grade flux-cored wire of claim 1, wherein the arc stabilizer is one or more of potassium titanate, sodium fluosilicate, sodium fluoride and carbonates.

6. The 500MPa grade flux cored wire of claim 1, wherein the catalyst is one or more of aluminum magnesium alloy and graphite.

7. The 500MPa grade flux cored welding wire of claim 1, wherein the low carbon steel strip is an SPCC cold rolled steel strip.

8. The 500MPa grade flux cored wire of claim 1, wherein the low carbon steel strip is 0.4-1.0mm thick and 12-16mm wide.

9. A preparation method of a 500 MPa-level flux-cored wire is characterized by comprising the following steps:

selecting a proper low-carbon steel strip, and rolling the low-carbon steel strip into a U shape through a welding wire forming machine;

heating the medicinal powder to the temperature of 100-;

and after filling, closing the opening, and then performing rough drawing, fine drawing and diameter shearing until the welding wire reaches the preset diameter.