阅读说明：本技术 一种适合陶瓷衬垫打底焊接的富氩气保护药芯焊丝及应用 (Argon-rich shielded flux-cored wire suitable for backing welding of ceramic liner and application ) 是由 吴光辉 刘飞 汪涛 刘�东 杨宗全 蔡俊 杨恒闯 于 2020-05-26 设计创作，主要内容包括：本发明提供了一种适合陶瓷衬垫打底焊接的富氩气保护药芯焊丝及应用,该药芯焊丝包括钢带以及填充于钢带内的药芯,所述药芯包括按质量百分比计的如下组分：锆英砂15～30％,金红石30～40％,石英5～15％,硅锰合金20～25％,氟化物1～3％,铝粉1～3％,镁砂10～14％,余量为铁粉。该发明采用高熔点的镁砂和锆英砂可消耗大量的电弧热量,从而大幅降低熔深,减少陶瓷衬垫的熔化,同时该药芯焊丝以富氩气体保护,在陶瓷衬垫打底焊接时,焊缝中心不会出现裂纹,减少了返工维修工作,提高了焊接工作效率,且其熔敷金属和焊接接头综合性能：屈服强度≥400MPa,抗拉强度≥490MPa,伸长率≥22％,-40℃条件下Akv≥47J。(The invention provides an argon-rich protection flux-cored wire suitable for backing welding of a ceramic liner and application thereof, wherein the flux-cored wire comprises a steel belt and a flux core filled in the steel belt, and the flux core comprises the following components in percentage by mass: 15-30% of zircon sand, 30-40% of rutile, 5-15% of quartz, 20-25% of silicon-manganese alloy, 1-3% of fluoride, 1-3% of aluminum powder, 10-14% of magnesia and the balance of iron powder. The invention adopts high melting point magnesite and zircon sand which can consume a large amount of arc heat, thereby greatly reducing the penetration depth and reducing the melting of the ceramic liner, and meanwhile, the flux-cored wire is protected by argon-rich gas, when the ceramic liner is bottomed and welded, no crack appears in the center of a welding line, the rework maintenance work is reduced, the welding work efficiency is improved, and the comprehensive properties of deposited metal and a welding joint are as follows: the yield strength is more than or equal to 400MPa, the tensile strength is more than or equal to 490MPa, the elongation is more than or equal to 22 percent, and Akv is more than or equal to 47J at the temperature of minus 40 ℃.)

1. The argon-rich shielded flux-cored wire suitable for backing welding of the ceramic liner comprises a steel strip and a flux core filled in the steel strip, and is characterized in that the flux core comprises the following components in percentage by mass: 15-30% of zircon sand, 30-40% of rutile, 5-15% of quartz, 20-25% of silicon-manganese alloy, 1-3% of fluoride, 1-3% of aluminum powder, 10-14% of magnesia and the balance of iron powder.

2. The argon-rich shielded flux cored welding wire suitable for ceramic liner backing welding of claim 1, wherein the fill rate of the flux core is 12-16%.

3. The argon-rich shielded flux-cored wire suitable for ceramic liner backing welding of claim 1, wherein the zircon sand comprises the following chemical components in percentage by mass: zirconium dioxide is more than 65 percent, silicon dioxide is more than 33 percent, and the balance is ferric oxide or ferrous oxide.

4. The argon-rich shielded flux cored welding wire suitable for ceramic liner backing welding of claim 1, wherein the rutile comprises the following chemical components in percentage by mass: more than 85% of titanium dioxide, less than 0.5% of ferric oxide or ferrous oxide and the balance of silicon dioxide.

5. The argon-rich shielded flux-cored wire suitable for ceramic liner backing welding of claim 1, wherein the silicon-manganese alloy comprises the following chemical components in percentage by mass: si is more than or equal to 22 percent, Mn is more than or equal to 63 percent, and the balance is iron or inevitable impurities.

6. The argon-rich shielded flux cored wire suitable for ceramic liner backing welding of claim 1, wherein the fluoride is one or a mixture of sodium fluoride, lithium fluoride, potassium fluosilicate and sodium fluosilicate.

7. The argon-rich shielded flux cored wire suitable for ceramic liner backing welding of claim 1, wherein the steel strip is an SPCC steel strip.

8. The use of the argon-rich shielded flux-cored wire suitable for ceramic liner backing welding as claimed in any one of claims 1 to 7, wherein Ar 80% + CO is used₂And 20% of argon-rich gas is used as shielding gas for welding.

Technical Field

The invention belongs to the technical field of welding materials, and particularly relates to an argon-rich shielded flux-cored wire suitable for backing welding of a ceramic liner and application thereof.

Background

The flux-cored wire is more and more widely applied in national economic construction, and the argon-rich gas shielded flux-cored wire has the characteristics of small splashing and low smoke dust in welding and is more and more popular with welders. In order to reduce back carbon arc gouging back and improve welding efficiency, a primary forming process of backing and single-side welding by sticking a ceramic liner on the back is usually adopted, but when the existing flux-cored wire is welded by adopting the process, longitudinal cracks often appear in the center of a welding seam, when the flux-cored wire is used for welding, the welding penetration is large, the ceramic liner is easier to melt, a large amount of aluminum silicate and other impurities appear in a welding seam molten pool, and the welding pool is solidified to generate serious segregation so that the longitudinal cracks appear in the welding seam more easily.

Disclosure of Invention

The invention aims to solve the problem that the center of a welding seam often has longitudinal cracks when the traditional flux-cored wire adopts ceramic liner backing welding.

Therefore, the invention provides an argon-rich shielded flux-cored wire suitable for backing welding of a ceramic liner, which comprises a steel strip and a flux core filled in the steel strip, wherein the flux core comprises the following components in percentage by mass: 15-30% of zircon sand, 30-40% of rutile, 5-15% of quartz, 20-25% of silicon-manganese alloy, 1-3% of fluoride, 1-3% of aluminum powder, 10-14% of magnesia and the balance of iron powder.

Further, the filling rate of the medicine core is 12-16%.

Further, the zircon sand comprises the following chemical components in percentage by mass: zirconium dioxide is more than 65 percent, silicon dioxide is more than 33 percent, and the balance is ferric oxide or ferrous oxide. When the content of zirconium dioxide is less than 65% and the content of silicon dioxide is less than 33%, yellow residues are easy to appear on the surface of a welding seam of the flux-cored wire, and the separation of welding slag is poor.

Further, the rutile comprises the following chemical components in percentage by mass: greater than 85% titanium dioxide, iron oxide orLess than 0.5 percent of ferrous oxide and the balance of silicon dioxide. Titanium dioxide less than 85% will result in TiO in the slag₂The content is insufficient and the content of the silicon dioxide exceeds the related requirements, so that the all-position welding process is deteriorated, the number of the acidic inclusions in the welding seam is increased, and the low-temperature impact toughness of the welding seam is reduced.

Further, the silicon-manganese alloy comprises the following chemical components in percentage by mass: si is more than or equal to 22 percent, Mn is more than or equal to 63 percent, and the balance is iron or inevitable impurities. When Mn is lower than 63%, the content of Mn in a welding seam is insufficient, and impact toughness is poor; si less than 22% results in insufficient deoxidation and a decrease in weld impact toughness.

Further, the fluoride is one or a mixture of sodium fluoride, lithium fluoride, potassium fluosilicate and sodium fluosilicate.

Further, the steel strip is an SPCC steel strip.

In addition, the invention also provides application of the argon-rich shielded flux-cored wire suitable for backing welding of the ceramic liner, and Ar 80% + CO is adopted₂And 20% of argon-rich gas is used as shielding gas for welding.

The design principle of the invention is as follows:

zircon sand mainly providing ZrO₂The melting point of the flux-cored wire slag is improved, and the slag separation performance is improved;

rutile provides primarily TiO₂The all-position welding process performance of the flux-cored wire is improved, and meanwhile, the welding arc can be stabilized;

quartz is mainly used as a SiO2 source, slag is regulated, and the quartz is used as a slagging agent;

the silicon-manganese alloy mainly provides sources of Mn and Si components and participates in deoxidation;

the fluoride mainly provides fluorine element, and considering that the fluorine has the function of worsening electric arc, the fluoride containing elements such as lithium, potassium, sodium and the like or a mixture thereof is adopted;

the aluminum powder is used as a strong deoxidizing and denitriding agent, so that the oxygen and nitrogen content in the weld joint can be reduced;

the magnesia mainly contains MgO, can improve the alkalinity of slag, and purify a weld pool, particularly can generate a compound with an acid oxide generated by melting a liner when a ceramic liner is welded, purify a weld and reduce weld segregation;

the iron powder can regulate the total amount of the medicinal powder and improve the conductivity of the medicinal powder.

The invention has the beneficial effects that:

(1) the argon-rich protection flux-cored wire provided by the invention adopts high-melting-point magnesite and zircon sand which can consume a large amount of arc heat, so that the penetration depth is greatly reduced, the melting of a ceramic liner is reduced, meanwhile, the magnesite is an alkaline oxide and can generate a spherical compound with an acidic oxide, a weld pool is further purified, the risk of component segregation caused by aluminosilicate slag inclusion is reduced, the low-temperature impact toughness is improved, and the use of the magnesite can reduce the use amount of a strong deoxidizer and the zircon sand, so that the titanium content of the weld is reduced, the surface tension of the weld pool is reduced, the fluidity of molten pool liquid is improved, the component segregation is weakened, and the weld strength is reduced.

(2) The argon-rich gas shielded flux-cored wire provided by the invention is shielded by argon-rich gas, when a ceramic liner is subjected to backing welding, no crack occurs in the center of a welding line, the rework maintenance work is reduced, the welding work efficiency is improved, and the deposited metal and the welding joint have comprehensive properties: the yield strength is more than or equal to 400MPa, the tensile strength is more than or equal to 490MPa, the elongation is more than or equal to 22 percent, and Akv under the condition of minus 40 ℃ is more than or equal to 47J.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides an argon-rich protection flux-cored wire suitable for backing welding of a ceramic liner, which comprises a steel belt and a flux core filled in the steel belt, wherein the flux core comprises the following components in percentage by mass: 15-30% of zircon sand, 30-40% of rutile, 5-15% of quartz, 20-25% of silicon-manganese alloy, 1-3% of fluoride, 1-3% of aluminum powder, 10-14% of magnesia and the balance of iron powder.

The steel belt is an SPCC steel belt, the filling rate of a flux core is 12-16%, and the argon-rich shielded flux-cored wire is prepared by adopting a conventional flux-cored wire manufacturing process. The zircon sand comprises the following chemical components in percentage by mass: zirconium dioxide is more than 65 percent, silicon dioxide is more than 33 percent, and the balance is ferric oxide or ferrous oxide; the rutile comprises the following chemical components in percentage by mass: more than 85% of titanium dioxide, less than 0.5% of ferric oxide or ferrous oxide and the balance of silicon dioxide; the silicon-manganese alloy comprises the following chemical components in percentage by mass: si is more than or equal to 22 percent, Mn is more than or equal to 63 percent, and the balance is iron or inevitable impurities; the fluoride is one or a mixture of sodium fluoride, lithium fluoride, potassium fluosilicate and sodium fluosilicate.

The composition and performance of the argon-rich shielded flux-cored wire suitable for backing welding of ceramic liners according to the present invention are described in detail below with reference to specific examples; the core composition and the percentage (%) of the total mass of the core for examples 1 to 5 and the comparative example (excluding zircon sand and magnesia) are shown in table 1.

Table 1: flux-cored wire formula (mass percent)

The flux-cored wires prepared in the above examples and comparative examples were used to perform detection results of mechanical properties of deposited metal and penetration of weld joints in backing welding of ceramic liners, and the detection results are shown in table 2.

Table 2: deposited metal mechanical property and ceramic liner backing weld seam penetration detection crack rate

From the examples and comparative examples shown in tables 1 and 2, it can be seen that: the comprehensive properties of the flux-cored wire deposited metal and the welding joint are as follows: the yield strength is more than or equal to 400 MPa; the tensile strength is more than or equal to 490 MPa; the elongation is more than or equal to 22 percent; under the condition of minus 40 ℃, Akv is more than or equal to 47J, and the method is suitable for the back welding process of the argon-rich protective ceramic liner.

The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.