阅读说明：本技术 一种药芯焊丝 (flux-cored wire ) 是由 毛兰秀 于 2019-09-27 设计创作，主要内容包括：本发明涉及一种药芯焊丝,包括钢带以及填充在钢带内部的药粉,所述药粉包括的组分及其占所述药粉总量的质量百分比如下：金红石35-50%、石灰石5-8%、石墨0.4-0.6%、氧化铝5.5-8.5%、镁铝合金3.5-6.5%、氟化物2-5%、硅锰合金1.6-2.8%、硼粉4-8%、铬粉3-6%、镍粉2.5-3.5%、钛粉0.8-2%、铝粉0.5-1.5%、铌粉0.1-0.5%,余量为铁粉。本发明提高药芯焊丝与母体金属焊接时抗气孔性能的效果。(the invention relates to a flux-cored wire, which comprises a steel belt and medicinal powder filled in the steel belt, wherein the medicinal powder comprises the following components in percentage by mass in the total amount of the medicinal powder: 35-50% of rutile, 5-8% of limestone, 0.4-0.6% of graphite, 5.5-8.5% of alumina, 3.5-6.5% of magnesium-aluminum alloy, 2-5% of fluoride, 1.6-2.8% of silicon-manganese alloy, 4-8% of boron powder, 3-6% of chromium powder, 2.5-3.5% of nickel powder, 0.8-2% of titanium powder, 0.5-1.5% of aluminum powder, 0.1-0.5% of niobium powder and the balance of iron powder. The invention improves the effect of the anti-porosity performance of the flux-cored wire when welding with parent metal.)

1. the flux-cored wire comprises a steel strip and powder filled inside the steel strip, and is characterized in that: the medicinal powder comprises the following components in percentage by mass: 35-50% of rutile, 5-8% of limestone, 0.4-0.6% of graphite, 5.5-8.5% of alumina, 3.5-6.5% of magnesium-aluminum alloy, 2-5% of fluoride, 1.6-2.8% of silicon-manganese alloy, 4-8% of boron powder, 3-6% of chromium powder, 2.5-3.5% of nickel powder, 0.8-2% of titanium powder, 0.5-1.5% of aluminum powder, 0.1-0.5% of niobium powder and the balance of iron powder.

2. the flux cored welding wire of claim 1, wherein: the medicinal powder comprises the following components in percentage by mass: 42% of rutile, 6.5% of limestone, 0.47% of graphite, 7.1% of alumina, 4.3% of magnesium-aluminum alloy, 3% of fluoride, 1.7% of silicon-manganese alloy, 5.5% of boron powder, 4% of chromium powder, 2.85% of nickel powder, 1.2% of titanium powder, 0.83% of aluminum powder, 0.18% of niobium powder and the balance of iron powder (20.37).

3. the flux cored welding wire of claim 1, wherein: the medicinal powder comprises the following components in percentage by mass: 44% of rutile, 7.5% of limestone, 0.56% of graphite, 8.2% of alumina, 5.5% of magnesium-aluminum alloy, 4.5% of fluoride, 2.5% of silicon-manganese alloy, 6.8% of boron powder, 5.3% of chromium powder, 3.35% of nickel powder, 1.7% of titanium powder, 1.25% of aluminum powder, 0.38% of niobium powder and the balance of iron powder (8.46).

4. The flux cored welding wire of claim 1, wherein: the silicon-manganese ratio in the silicon-manganese alloy is 1: (3-3.5).

5. the flux cored welding wire of claim 1, wherein: the fluoride is the combination of any two or more than two of CaF2, LiBaF, NaF, K2SiF6 and K3AlF 6.

6. the flux cored welding wire of claim 1, wherein: the mass percentage of the powder in the total amount of the welding wire is 16-18%.

7. The flux cored welding wire of claim 1, wherein: the powder needs to be pretreated, and the pretreatment steps are as follows: mixing the raw materials of the powder, granulating, sintering at 850 deg.C for 15-20min at 700-.

8. the flux cored welding wire of claim 7, wherein: and before the fine powder is filled into the steel belt, drying treatment is carried out, wherein the drying temperature is 150-200 ℃, and the drying time is 10-15 min.

Technical Field

The invention relates to the technical field of metal welding materials, in particular to a flux-cored wire.

Background

the welding wire is used as a filler metal or a metal welding material for electric conduction. In gas welding and gas tungsten arc welding, a welding wire is used as a filler metal; in submerged arc welding, electroslag welding and other gas metal arc welding, the wire is both a filler metal and a conductive electrode. The flux-cored wire is generally divided into a solid-cored wire and a flux-cored wire, wherein the outer layer of the flux-cored wire is made of metal materials, the inner layer of the flux-cored wire is wrapped with powder meeting different welding requirements, and the solid-cored wire is not wrapped with the powder and is also called a powder-cored wire or a tubular wire and is divided into two types of gas protection and non-gas protection. The surface of the flux-cored wire is made of low-carbon steel or low-alloy steel with better plasticity like a solid-core welding wire. The flux-cored wire is produced through rolling steel belt into U-shaped section, filling U-shaped steel belt with compounded powder, pressing the powder inside the pipe with a rolling mill, and serial drawing to form flux-cored wires of different specifications.

At present, the domestic flux-cored wire production technology is basically mature, but the problems of poor air resistance and the like generally exist when a spraying part is welded by a common flux-cored wire, so that serious air hole defects are generated when a welding seam is welded. Therefore, the technological operation during welding must be strictly controlled, and the base metal must be pretreated once before welding, so that the labor intensity of workers is increased, and the labor efficiency is reduced.

disclosure of Invention

the invention aims to provide a flux-cored wire which has the effect of improving the anti-porosity performance when the flux-cored wire is welded with parent metal.

The technical purpose of the invention is realized by the following technical scheme: the flux-cored wire comprises a steel belt and powder filled in the steel belt, wherein the powder comprises the following components in percentage by mass in the total amount of the powder: 35-50% of rutile, 5-8% of limestone, 0.4-0.6% of graphite, 5.5-8.5% of alumina, 3.5-6.5% of magnesium-aluminum alloy, 2-5% of fluoride, 1.6-2.8% of silicon-manganese alloy, 4-8% of boron powder, 3-6% of chromium powder, 2.5-3.5% of nickel powder, 0.8-2% of titanium powder, 0.5-1.5% of aluminum powder, 0.1-0.5% of niobium powder and the balance of iron powder.

By adopting the technical scheme, the silicon-manganese alloy and the magnesium-aluminum alloy are composite deoxidizers and have strong deoxidation effect, and the influence of the oxidation effect of gases such as CO2 on deposited metal is reduced or eliminated by controlling the addition proportion of the silicon-manganese alloy and the magnesium-aluminum alloy, so that the content of pores in the deposited metal is reduced, and the stability of electric arc and the pore resistance of the deposited metal are enhanced by the silicon-manganese alloy and the magnesium-aluminum alloy;

Limestone and fluoride generate protective gas in the combustion process of the welding wire, so that the influence of nitrogen elements in the air on deposited metal is separated, and meanwhile, the external harmful gas is prevented from permeating into the deposited metal to generate pores in the deposited metal, so that the pore resistance of the flux-cored wire is improved; when the slag is too little, the molten drop splashes greatly, the smog is large, the deposited metal is difficult to obtain a good forming effect, and the fluoride is also used as a slag forming agent to make up the defect of poor forming rate of the deposited metal due to too little slag;

The main component of rutile is titanium dioxide, and the titanium dioxide has the functions of slagging and arc stabilization in the formula;

the main component of the graphite is carbon, the carbon reacts with titanium powder, niobium powder and the like to generate hard carbides with smaller particles, and the hard carbides are dispersed in the deposited metal, so that the physical and chemical properties of the deposited metal, such as strength, hardness, cracking resistance, wear resistance, creep resistance, high-temperature stability and the like, can be improved;

the alumina has higher melting point and has the function of improving the melting point, viscosity and surface tension of the slag;

the addition of trace elements such as boron powder, titanium powder and the like is beneficial to grain refinement, and the quantity of acicular ferrite in the deposited metal is increased, so that the low-temperature toughness of the weld metal is improved, and the deposited metal is prevented from generating cracks in the welding process;

the chromium powder can be dissolved in the iron matrix in a solid manner, and plays a role in increasing the strength and the corrosion resistance of the matrix; chromium atoms and carbon atoms form carbides at the crystal boundary of a matrix structure, and the carbides are usually distributed in a net shape or a dendritic shape, so that the wear resistance and the tensile strength of the welding line alloy are improved;

The nickel powder and the niobium powder can form a fine dispersed phase and a new solid solution strengthening phase, refine the coating structure and prevent austenite grains from growing, so that the deposited metal structure is fine and uniform, and the strength and the toughness of the deposited metal are enhanced;

The aluminum powder has good denitrification effect, is beneficial to reducing the influence of nitrogen elements in the air on deposited metal in the welding process, and avoids a large amount of pores generated inside the deposited metal, thereby improving the pore resistance of the flux-cored wire;

The iron powder is used for reducing the content of harmful gas in the deposited metal, improving the transition form of molten drops and reducing the splashing of the molten drops, thereby improving the forming rate and the air hole resistance of the deposited metal and reducing the cracks of the deposited metal.

The invention is further configured to: the medicinal powder comprises the following components in percentage by mass: 42% of rutile, 6.5% of limestone, 0.47% of graphite, 7.1% of alumina, 4.3% of magnesium-aluminum alloy, 3% of fluoride, 1.7% of silicon-manganese alloy, 5.5% of boron powder, 4% of chromium powder, 2.85% of nickel powder, 1.2% of titanium powder, 0.83% of aluminum powder, 0.18% of niobium powder and the balance of iron powder.

The invention is further configured to: the medicinal powder comprises the following components in percentage by mass: 44% of rutile, 7.5% of limestone, 0.56% of graphite, 8.2% of alumina, 5.5% of magnesium-aluminum alloy, 4.5% of fluoride, 2.5% of silicon-manganese alloy, 6.8% of boron powder, 5.3% of chromium powder, 3.35% of nickel powder, 1.7% of titanium powder, 1.25% of aluminum powder, 0.38% of niobium powder and the balance of iron powder.

the invention is further configured to: the silicon-manganese ratio in the silicon-manganese alloy is 1: (3-3.5).

by adopting the technical scheme, the silicon-manganese addition ratio in the silicon-manganese alloy is controlled within a proper range, and the deoxidation performance of the flux-cored wire and the mechanical property of deposited metal are improved.

the invention is further configured to: the fluoride is the combination of any two or more than two of CaF2, LiBaF, NaF, K2SiF6 and K3AlF 6.

by adopting the technical scheme, CaF2, LiBaF, NaF, K2SiF6 and K3AlF6 are all metal fluorides, the metal fluorides are beneficial to forming molten slag, effective chemical components in the molten slag are all metal components, and the molten slag of the metal components covers the surface of deposited metal, so that the splashing degree of molten drops is reduced, and the welding forming effect of the deposited metal is improved; CaF2, LiBaF, NaF, K2SiF6 and K3AlF6 are cheap and easily available, so that two or more of the above fluorides are selected for use in combination.

the invention is further configured to: the mass percentage of the powder in the total amount of the welding wire is 16-18%.

by adopting the technical scheme, when the content of the medicinal powder is too low, the welding wire cannot be filled firmly, a gap exists in the welding wire, powder mixing is easily caused in the subsequent process, and the welding wire is easily flattened during wire feeding, so that the wire feeding is unsmooth; gas is brought into gaps in the welding wire when the welding wire enters a molten pool, so that pores of deposited metal are increased, and the pore resistance of the deposited metal is reduced; when the powder content is too low, the steel belt can not wrap the powder, so that the powder leaks outwards, serious waste is caused, the welding and drawing difficulty can be increased, and the welding and drawing efficiency is reduced.

The invention is further configured to: the powder needs to be pretreated, and the pretreatment steps are as follows: mixing the raw materials of the powder, granulating, sintering at 850 deg.C for 15-20min at 700-.

by adopting the technical scheme, the raw materials of the medicinal powder are uniformly mixed, granulated and crushed, the particle size of the crushed fine powder is controlled to be 75-90 meshes, and the physical and chemical properties of metal elements in the raw materials of the medicinal powder can be influenced due to the overlarge particle size of the fine powder, so that the fine powder needs to be controlled within a proper range.

the invention is further configured to: and before the fine powder is filled into the steel belt, drying treatment is carried out, wherein the drying temperature is 150-200 ℃, and the drying time is 10-15 min.

by adopting the technical scheme, the fine powder is dried before being filled, and the moisture in the fine powder is removed, so that the storage period of the fine powder is prolonged, the service life of the flux-cored wire is prolonged, and the influence of the moisture on deposited metal performance in the welding process is reduced.

in conclusion, the beneficial technical effects of the invention are as follows:

1. The influence of the oxidation of gases such as CO2 and the like on the deposited metal is reduced or eliminated by controlling the adding proportion of the silicon-manganese alloy and the magnesium-aluminum alloy, so that the content of pores in the deposited metal is reduced, and the pore resistance of the deposited metal is enhanced;

2. Limestone and fluoride generate protective gas in the combustion process of the welding wire, so that the influence of nitrogen elements in the air on deposited metal is separated, and meanwhile, the external harmful gas is prevented from permeating into the deposited metal to generate pores in the deposited metal, so that the pore resistance of the flux-cored wire is improved;

3. The silicon-manganese addition ratio in the silicon-manganese alloy is controlled within a proper range, so that the deoxidation performance of the flux-cored wire and the mechanical property of deposited metal are improved.

Detailed Description